Question about 1994 Toyota 4Runner

1 Answer

FUEL SYSTEM.NO FUEL PRESSURE.WHAT COULD BE THE PROBLEM?

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 56 Answers

Always start at the begining,in this case if you have fuel in the tank it may be the electric pump!

Posted on Aug 05, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Vehicle CEL is on, various codes


P0300 is a random miss fire , a vacuum leak can cause this as well as low fuel pressure ! weak fuel pump , clogged fuel filter !
DTC P0171: Fuel Trim System Lean Bank 1
DTC P0174: Fuel Trim System Lean Bank 2 These two codes are saying the PCM - engine computer is see a lean condition .
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
Circuit/System Description
The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump flow control module (FPCM) monitors the voltage signal from the fuel pressure sensor.

You don't say what make , model an year vehicle ! These are for GM vehicles , yours could mean something else . Except the first three , those are genaric codes , same for all makes ! So can't say what this codes are P2097, and P2099 ! Can't mean this P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1
P2099 - Post Catalyst Fuel Trim System Too Rich Bank 2

Sep 03, 2016 | Cars & Trucks

1 Answer

I. Have a 2000 Lincoln town car I just replaced the fuel pump and fuel filter its reading 38lbs of fuel pressure it starts and shut off after a few seconds


Fuel pressure should be about 138psi or more. So there is a little animal called a fuel pump regulator that the ECU tells what the engine needs from the fuel pump, my guess is that is the problem, perhaps not the fuel pump. Low fuel pressure, in spite of DIY may be the fuel pressure regulator which if and appears to be bad would give you this low pressure. There should be ECU error codes that identify fuel system problems. Ask your favorite Auto parts store (nicely) to read the codes for you.

Apr 06, 2015 | Lincoln Cars & Trucks

1 Answer

Could it be that the ecu is wrong


No it is not Catalytic Converter related. Your fuel tank pressure sensor must be disconnected or the wiring to it defective for the evaporative emission system.
P0453 HONDA - Fuel Tank Pressure Sensor High Voltagexicon.jpghttp://engine-codes.com/p0453_honda.htmlForum CodePossible causes- Fuel Tank Pressure sensor harness is open or shorted
- Fuel Tank Pressure sensor circuit poor electrical connection
- Fuel Tank Pressure Sensor
- Faulty Engine Control Module (ECM) When is the code detected?A high voltage signal from the fuel tank pressure sensor is sent to Engine Control Module (ECM).
P0450 - Evaporative Emission Control System Pressure Sensor Malfunctionxicon.jpghttp://engine-codes.com/p0450.htmlForum CodePossible causes- Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Evaporative Emission System (EVAP) Pressure Sensor
- Faulty Engine Control Module (ECM) When is the code detected?- An improper voltage signal from EVAP control system pressure sensor is sent to ECM.

Aug 10, 2012 | 1998 Honda Civic

1 Answer

How to take off a fuel pressure regulator on a 2000 ford excursion


bleed off pressure by disconnecting wiring from inertia switch or pull fuse for the pump, start engine till it stalls. pressure will be zero.
pressure regulator is on fuel rail. They seldom go. If you are losing pressure overnight or low pressure ( below 40 psi), it is likely the check valve in the fuel pump in the tank.

Pressure Regulator -Fuel 4.6L 4V Removal
syj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related components. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in personal injury.
syj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before working on or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved. Failure to follow these instructions may result in personal injury.
  1. Relieve the fuel pressure. For additional information, refer to Section 310-00 .
  1. Remove the upper intake manifold. (BIG JOB). For additional information, refer to Section 303-01B .
  1. Remove the fuel pressure regulator (9C968).
    1. Disconnect the fuel pressure regulator vacuum hose.
    1. Remove the snap ring.
    1. Remove the fuel pressure regulator.
  1. Remove and discard the fuel pressure regulator O-ring seals.
Installation
  1. syj~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Use O-ring seals that are made of special fuel resistant material. Use of ordinary O-ring seals can cause the fuel system to leak. Do not reuse O-ring seals.
    NOTE: Lubricate the new O-ring seals with clean Super Premium SAE 5W-30 Motor Oil XO-5W30-QSP or equivalent meeting Ford specification WSS-M2C153-G, to aid installation.
    To install, reverse the removal procedure.
---------------------------------------------------------------------------------------
Pressure Regulator -Fuel 4.6L 2V, 4.6L 2 Valve Removal
syj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related components. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in personal injury.
syj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before working on or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved. Failure to follow these instructions may result in personal injury.
  1. Relieve the fuel pressure. For additional information, refer to Section 310-00 .
  1. Remove the fuel pressure regulator.
    1. Disconnect the vacuum hose.
    1. Remove the snap ring.
    1. Remove the fuel pressure regulator.
  1. Remove and discard the fuel pressure regulator O-ring seals.
Installation
  1. syj~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Use O-ring seals that are made of special fuel resistant material. Use of ordinary O-ring seals can cause the fuel system to leak. Do not reuse the O-ring seals.
    NOTE: Lubricate the new O-ring seals with clean Super Premium SAE 5W-30 Motor Oil XO-5W30-QSP or equivalent meeting Ford specification WSS-M2C153-G, to aid installation.
    To install, reverse the removal procedure.

Jun 10, 2011 | 2000 Ford Excursion

1 Answer

Honda Civic Coupe. Year 2000 1.6. How can I depressurize the fuel system easily to change the fuel filter situated in the engine compartment.


Hi,

IMPORTANT: Do not skip the fuel system pressure release step. Injury and other damage can result!
Safety Step! Relieving Fuel System Pressure
· allow engine to cool
· relieve fuel system pressure
· put on your eye protection
Before you begin the job of replacing your fuel filter, you must relieve the pressure in your fuel system. A fuel injection system operates under very high pressure. If you don't release this pressure before you start unscrewing fuel lines the result can be explosive. Do this before you attempt to change the fuel filter.
To release the pressure in your fuel lines (and fuel filter) you'll need to locate the fuel pump fuse in the fuse box. If you don't have a fuel pump fuse, find the relay that operates the fuel pump. Once you've found the fuel pump fuse or relay, start the car. With the engine running, pull the fuse or relay out. If you pulled the right one, the engine will quickly die. Since it's using all of the pressurized fuel in the system, the fuel lines won't be pressurized when you crack the fittings on your fuel filter.
Now that you've relieved the fuel pressure you can remove the old fuel filter.
If you didn't do this yet, you must go to the previous step and do it. Very dangerous!

Best regards.

Oct 28, 2010 | 2000 Honda Civic

1 Answer

I put a new fuel pump in my 97 concorde, it ran just fine all the way home, but in the morning i wouldnt start. i put another pump in and the same thing happend. could this be a short somewhere?


Well, the fuel pump relay may not be getting electricity to the fuel pump.

Also, use the following procedure to test the fuel pump before changing it again:

TESTING Fig. 1: Connect the fuel pressure gauge C4799B or equivalent to the fuel rail service valve - 3.3L shown 88175g09.gif
Fig. 2: Checking the fuel pressure with a gauge - 3.5L shown 88175g10.gif
Fig. 3: Checking the pressure between the pump and the filter 88175g11.gif
Fig. 4: Place the other end of the adapter 6668 into an approved gasoline container 88175g12.gif
  1. Release the fuel system pressure as described in earlier in this section.
  2. Remove the protective cover from the service valve on the fuel rail.
  3. Connect fuel pressure gauge C-4799B or equivalent to the fuel rail service valve.
  4. Place the ignition key in the ON position. Using the DRB III tester or equivalent, access the ASD fuel system test. (The ASD fuel system test will activate the fuel pump and pressurize the system.)
  5. If the gauge reading equals the specifications, then further testing is not required. Without vacuum applied to the regulator, the 3.3L engine fuel system operates at 55 psi (379 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 46 psi (317 kPa). Without vacuum applied to the regulator, the 3.5L engine fuel system operates at 48 psi (331 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 39 psi (269 kPa). The fuel system pressure varies with the different amounts of manifold vacuum applied to the regulator. If the pressure is not correct, record the pressure and remove the gauge.
  6. Ensure that the fuel does not leak from the fuel rail service valve. Install the protective cover onto the fuel rail service valve.
  7. If the fuel pressure reading was below the specifications, test the system according to the following procedure:
    1. Perform the fuel pressure release procedure.
    2. Install a fuel gauge C4799 and fuel adapter 6631 or equivalent in the fuel supply line between the tank and the fuel filter.
    3. Using the DRB III scan tool or equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  8. If the pressure is at least 5 psi (1 kPa) or higher than the reading recorded, replace the fuel filter.
  9. If no change is observed, gently squeeze the return hose. If the pressure increases, replace the pressure regulator. If the gauge reading does not change when the return hose is squeezed, the problem is either a plugged inlet strainer or defective fuel pump.
  10. If the fuel pressure reading was above the specifications test the system according to the following procedure:
    1. Perform the pressure release procedure.
    2. Install fuel pressure gauge C4799 and adapter 6631 or equivalent in the fuel supply line between the fuel tank and the fuel filter.
    3. Remove the fuel return line hose from the pump at the tank. Connect pressure test adapter 6668 or equivalent to the return line. Place the other end of adapter 6668 into an approved gasoline container. A minimum of 2 gallon tank should be sufficient. All return fuel will flow into the container.
    4. Using the DRB III scan tool or its equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  11. If the pressure is now correct, replace the fuel pump.
  12. If the pressure is still above specifications, remove the fuel return hose from the chassis fuel tubes (at the engine) and attach fuel pressure test adapter 6668 or equivalent to the return tube. Place the other end of the hose in the clean container, repeat the test. If the pressure is now correct, check for a restricted fuel return line. If there is no change observed, replace the fuel pressure regulator.
prev.gif next.gif

Oct 08, 2010 | 1997 Chrysler Concorde

1 Answer

Where is the FUEL PRESSURE REGULATOR


Under the upper intake manifold:

This procedure is for the CSFI system as the CMFI system uses an integral fuel pressure regulator. The CSFI uses a replacable unit mounted on the CSFI assembly.


REMOVAL & INSTALLATION

  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure. Refer to the fuel system relief procedure in this section.
  3. Remove the upper manifold assembly.
  4. Remove the fuel pressure regulator vacuum tube.
  5. Disassemble the fuel pressure regulator snapring retainer.
  6. Remove the fuel pressure regulator assembly and the O-rings. Discard the O-rings, filter and back-up O-rings.

To install:
  1. Lubricate the O-rings with clean engine oil and install as an assembly.
  2. Install the fuel pressure regulator, attach the vacuum tube.
  3. Install the snapring retainer.
  4. Install the upper manifold assembly.
  5. Connect the negative battery cable.

Oct 02, 2010 | 1993 Chevrolet Astro

1 Answer

REPLACEING FUEL FILTER


Pressure Relief
Special Tool(s) EFI/CFI Fuel Pressure Gauge
310-012 (T80L-9974-B) swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.
swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before servicing or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal injury or a fire hazard.
  1. Remove the schrader valve cap and attach the EFI/CFI Fuel Pressure Gauge.
  2. e5e3ebf.gif
    NOTE: Open the manual valve slowly to relieve the system pressure. This may drain fuel from the system. Place fuel in a suitable container.
    Open the manual valve on the EFI/CFI Fuel Pressure Gauge slowly and relieve the fuel pressure. 9deacdd.gif
    Filter Removal
    1. Relieve the fuel pressure; refer to Above.
    1. Remove the fuel filter (9155).
      1. Disconnect the fuel lines
      1. Remove the fuel filter from the fuel filter support.
      2. b717c63.gif
      1. Push Connect Fittings
        Special Tool(s) Fuel Line Disconnect Tool
        310-S039 (T90T-9550-S) 4bbcf9e.gif
        1. Relieve the fuel pressure; refer to Pressure Relief in this section.
        1. Disconnect the safety clip from the male hose.
        2. Install the fuel line disconnect tool and push into the fitting. f0af03c.gif
          Install the fuel line disconnect tool and push into the fitting. 367328f.gifSeparate the fittings.
          • Inspect for damage.
          • Clean the fittings.
          • 3beef33.gif

Sep 02, 2010 | 1998 Ford Explorer

1 Answer

2002 sebring where is the fuel pressure regulator located?


The fuel system is under a constant pressure, even with engine off. before servicing the fuel filter/fuel pressure regulator, the fuel system pressure must be released.
CAUTION The fuel system is under pressure when the engine is running, 58 psi, plus or minus 5 psi. (400 kPa plus or minus 34 kPa). The fuel pump module contains a check valve to maintain some fuel pressure even when the engine is not operating. This will help to start the engine. Before servicing the fuel filter/fuel pressure regulator, the fuel system pressure must be released.

Hope this help.

Apr 02, 2010 | 2002 Chrysler Sebring

1 Answer

I need the operating fuel pressure for a 1989 Rolls Royce Corniche II.


Here it is and all the info you would ever need on the bosch k series.
spacerline.jpg “ This tech told me that the only way the fuse would quit blowing was by unhooking the coil pack. I was stunned at first, since the power to the coil is through a red/light green (R/LG) wire and from a different fuse than the solid red. ” ---> The K-Series fuel injection systems are continuous mechanical fuel injection systems used on a wide variety of European vehicles, including such makes as Volkswagon, Audi, BMW, Mercedes, Porsche, Volvo and Saab. The system is one of the most common fuel injection systems on the market today, but also is one of the least understood.
The K-Jetronic System constantly injects fuel into the engine as long as the car is running and air flow is present to move the sensor plate in the airflow sensor. The sensor plate is connected to an arm that pushes up on a plunger located in the fuel distributor. As airflow changes, the movement of the sensor plate and the plunger increase and decrease the volume of fuel injected into the engine. Since fuel is being injected constantly, fuel pressure will have a direct affect on driveability. As a matter of fact, fuel pressure is the single most critical element when diagnosing driveability problems in the K-Series fuel injection systems. An accurate fuel pressure gauge must be used when testing these systems, with a range of 0 to more than 100 psi. You will also need a digital volt ohm meter (DVOM) that can read milliamps.
You will work with three types of pressures when diagnosing these systems: system pressure, control pressure (also known as counter pressure) and rest pressure.
System pressure is the total fuel pressure produced by the fuel pump on a constant basis. The fuel pump must be able to maintain this pressure during all driving conditions from idle to wide open throttle. As a rule, system pressure will run about 5 to 5.5 bar pressure, or 75 to 85 psi (1 bar = about 15 psi) and the pump should be able to produce a minimum volume of 1 pint in 15 seconds. When deadheaded, the K-Series fuel pump will produce about 1.5 times the system pressure or about 110 to 120 psi. System pressure is a function of volume of fluid moved against a restriction, so to maintain system pressure at the desired level, there must be some type of restriction built into the fuel system. This restriction is more commonly known as the fuel pressure regulator. The fuel pressure regulator restricts the return of fuel to the tank by a calibrated amount, maintaining system pressure at the desired level. On early K-Jet systems, this regulator was a slide valve (also known as a push valve) internal to the fuel distributor. Fuel pressure could be adjusted by adding or removing shims from the valve. On later K-Jet systems, the regulator is the conventional diaphragm type.
Control pressure (or counter pressure) is the pressure that is metered to the top of the fuel plunger on a K-Jet system. By changing the counter pressure, the resistance to plunger movement is changed, allowing enrichment and enleanment of the fuel mixture to the engine. On a car equipped with K-Jet, this pressure is controlled by the warm-up regulator.
The warm-up regulator only compensates for engine temperature and is therefore a rather coarse control of fuel mixture. (Some K-Jet warm-up regulators also have a vacuum port to help with the acceleration enrichment and deceleration enleanment function.) Typical control pressures on a K-Jet warm-up regulator are 55 psi with the engine at full operating temperature and 20 to 30 psi on a cold engine. (The colder the engine, the lower the pressure.)
A car equipped with K-Jet Lambda also changes control pressure with a warm-up regulator (with pressures similar to a plain K-Jet system), but also controls lower chamber pressure in the fuel distributor by bleeding pressure through a frequency valve. By modifying lower chamber pressure, a change in volume of injected fuel is made, enriching or enleaning the mixture. The frequency valve is nothing more than an electrically duty-cycled fuel pressure regulator controlled by an on-board computer in response to an oxygen sensor signal. This system provides a more precise and rapid control of fuel mixture. Typical duty cycle on a properly running engine is 45 percent to 55 percent duty and fluctuating. A quick test of this system is to start the engine and test the frequency valve for vibration or noise -- it should vibrate. Also, unplugging the oxygen sensor will put the system in open loop and fix the frequency valve at a 50 percent duty cycle.
The KE-Jet system provides quicker response and more precise control of fuel mixture than the K-Jet Lambda system and is the current K-Jet system in use. This system uses a device called a differential pressure regulator to control fuel mixture in response to both engine temperature and oxygen sensor signals. In the KE-Jet system, counter pressure is broken down into primary counter pressure and control counter pressure. Primary counter pressure is the pressure applied to the top of the fuel plunger. This pressure stays constant and is the same as system pressure.
Control counter pressure is modified by the differential pressure regulator and is actually the lower chamber pressure in the fuel distributor. By modifying lower chamber pressure, the fuel mixture can be enriched or enleaned in response to temperature and oxygen sensor signals. Typical control counter pressures are 4 to 7 psi less than system pressure on a fully warmed engine and 17 to 20 psi less than system pressure on a cold engine (typical system pressures are 5.0 to 5.5 bar or 75 to 85 psi). The signal to the differential pressure regulator from the computer is measured in milliamps of current. To test this signal, a DVOM must be placed in series with the differential pressure regulator. Typical current values are 80 milliamps cold engine (15k ohm resistor in place of coolant temp sensor to simulate a cold engine condition); 120 milliamps during cranking (this is a crank enrich function to aid starting); and 8 to 12 milliamps warm idle. (Note: always check service manual for values.) These values correspond to the fuel pressures listed. In other words, at 80 milliamps current you should show 17 to 20 psi less than system pressure.
Rest pressure is the fuel pressure maintained in the system by the fuel accumulator after engine shutdown. The fuel accumulator is a large spring-loaded diaphragm that maintains a pressure of about 1.5 to 2.0 bar for 30 minutes or more after engine shutdown. This rest pressure provides for fast restart and prevents fuel percolation or boiling (vapor lock). Always check the service manual for the car line you are working on for proper rest pressures and times. Typical symptoms caused by accumulator problems are extended crank time and hard start hot.
With an understanding of the system and the proper tools, K-Jetronic fuel system service is a straightforward procedure that can keep your service bays full all year long. Give me a call if you have any questions!...did this help? Let me know...dc


May 11, 2009 | 2000 Rolls Royce Corniche

Not finding what you are looking for?
1994 Toyota 4Runner Logo

Related Topics:

82 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts

yadayada
yadayada

Level 3 Expert

76132 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...