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What should fuel pressure be - 2001 Mazda Tribute

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65 PSI with key on engine off
65 PSI with engine running
60 PSI while cranking

Posted on Jan 05, 2013

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I have 1997 Cadillac Deville 4.6 v8 Northstar 32 valve it has 90 pounds fuel pressure an it should have 40 to 50 pounds why is the fuel pressure so high?


Fuel pressure regulator . plugged fuel return line .

With the ignition switch ON and the fuel pump running, the fuel pressure indicated by the fuel pressure gage should be 333-376 kPa (48-55 psi).
The Fuel Pressure Check determines if the fuel system is providing fuel pressure. The components involved include the fuel tank, sending unit, pump, pipes and hoses, pressure regulator, fuel rail, and injectors. Also checked is the electrical operation of the fuel pump relay. This chart requires J 34730-1A , Fuel Pressure Gauge J 37287 , Inlet and Return Fuel Line Shut-off Adapters.

Feb 18, 2017 | Cadillac DeVille Cars & Trucks

1 Answer

Where is location of fuel volume regulator


Fuel pressure regulator ! An it's location is inside the fuel tank .
The fuel pump (FP) module contains the fuel pump, fuel pressure regulator and the fuel sender assembly. The fuel pressure regulator is attached to the fuel pump in the fuel pump module located in the fuel tank. It regulates fuel pressure supplied to the fuel injectors. The fuel pressure regulator is a diaphragm-operated relief valve. Fuel pressure is established by a spring preload applied to the diaphragm. Excess fuel is bypassed through the regulator and returned to the fuel tank.

Nov 18, 2015 | 2002 Ford Explorer

2 Answers

Fuel pressure 1998 jeep grand cherokee 4.0 L V6


You should have a test port on the Fuel Supply rail, use a tool from a local auto parts "Tool Loaner program" where you can borrow tools for free,w/a deposit of course,then follow the steps provided;

MPI Fuel System Pressure Test

The MPI fuel system used in vehicles equipped with a 4.OL engine employs a vacuum balanced pressure regulator. Fuel pressure should be approximately 55-69 kPa (8-10 psi) lower with the vacuum line attached to the regulator than with the vacuum line disconnected. System fuel should be 214 kPa (31 psi) with the vacuum line connected to the regulator and 269 kPa (39 psi) with the vacuum line disconnected. CAUTION: Some fuel may be discharged when connecting fuel gauge to fuel rail.
  1. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to test port pressure fitting on fuel rail (Fig. 7).
  2. Remove vacuum line from pressure regulator.
  3. Start the vehicle.
  4. Note gauge reading. With vacuum line disconnected, fuel pressure should be approximately 269 kPa (39 psi).
  5. Connect vacuum line to pressure regulator. Note gauge reading. Fuel pressure should be approximately 214 kPa (31 psi).
  6. If fuel pressure is not approximately 55-69 kPa (8-10 psi) higher with vacuum line removed from regulator, inspect pressure regulator vacuum line for leaks, kinks or blockage. CAUTION: Fuel pressure will rise to as much as 655 kPa (95 psi) when the fuel return tine is pinched shut, shut engine down immediately after pinching oft fuel return line.
  7. If fuel pressure is low, momentarily pinch shut the hose section of the fuel return line. If fuel pressure remains low, inspect the fuel supply line, fuel filter, and fuel rail inlet for blockage. If fuel pressure rises replace fuel pressure regulator.
  8. If fuel pressure is above specifications, inspect the fuel return line for kinks and blockage.

Capacity Test

  1. Remove the cap from the pressure test port in the fuel rail.
  2. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to the pressure fitting on the fuel rail (Fig. 7).
  3. Start the vehicle. Pressure should be approxi- mately 214 kPa (31 psi) with the vacuum hose connected to the pressure regulator and 269 kPa (39 psi) with the vacuum hose removed from the pressure regulator.
  4. If the pressure is not to specification, check the following before replacing the fuel pressure regulator:
  • 4a - Inspect the fuel supply and return lines/hoses for kinks or restricting bends
  • 4b - Check the fuel pump flow rate. A good fuel pump will deliver at least 1 liter of fuel per minute with the fuel return line pinched off. If the fuel pump does not pump adequately, then inspect the fuel system for a plugged fuel filter or fuel pump inlet filter (sock). Fuel pump flow rate can be done by connecting one end of an old A/C gauge hose to the fuel test port on the fuel rail and inserting the other end of the hose into a container of at least 1 liter capacity. Run the fuel pump by installing a jumper wire into diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the fuel return line or most of the fuel will be returned to the fuel tank.

May 19, 2014 | 1996 Jeep Grand Cherokee

1 Answer

How do I check the fuel pressure on a 2000 model mazda millenia with a 2.3 engine in it


Hi.

You connect a fuel pressure gauge like this to the pressure rail. Pressure in this car must be between 35 and 45 psi. If pressure is too low look for kinked fuel lines and eventually replace the pump. If the pressure drops down more than 10 psi in five minutes or if the pressure is considerably higher than that replace the fuel pressure regulator. Below the parts that may need testing:

ginko_261.gif

1. Fuel tank
2. Shut-off valve
3. Non-return valve
4. Fuel pump
5. Fuel pump (Transfer)
6. Fuel filter (High-pressure)
7. Injector
8. Pressure regulator
9. PRC solenoid valve
10. Fuel pump relay
11. Fuel pump resistor and relay (KJ model)

Aug 04, 2011 | 2000 Mazda Millenia

1 Answer

Car ships replaced wires plugs o2 sencer sometimes acts like it is flooding run fine on open road.


If it acts like it is flooding while idling, but it runs fine on the road, it could be running too rich and flooding it out due to leaking injectors, bad fuel pressure regulator, or excessive fuel pressure.

I would start by replacing the Fuel Pressure Regulator since it doesn't cost as much as the injectors.
Check your fuel pressure using a Fuel Pressure Check Gauge to see if the fuel pressure regulator is maintaining the proper pressure.

Vacuum is attached to the Fuel Pressure Regulator to control system pressure. When the fuel pressure regulator is not functioning properly it causes the fuel pressure to be above normal operating pressure. This condition causes excess fuel to be injected causing a rich mixture that produces black smoke.

Feb 16, 2011 | 1990 Subaru Legacy

1 Answer

I need to replace de fuel presurre sensor in a pontiac montana ,do i have to just replace the sensor ,o the sensor came with the fuel pump?thank you


Replacing the fuel pressure regulator, involves just replacing the regulator at the end of the fuel rail in the engine compartment, but fuel pressure sensor - does this mini-van have a fuel pressure sensor?
replacing the fuel pressure regulator: (1) locate it at the end of the fuel rail in the engine compartment,
(2) relieve fuel system pressure (3) disconnect fuel pressure regulator vacuum line. (4) remove fuel pressure regulator retaining screw (retain for re-use (5) using a shop towel to catch spilled fuel, lift & twist Fuel pressure regulator to remove it from the fuel rail. (6) remove/discard retainer and spacer bracket from the fuel rail. (7) remove fuel pressure regulator from the engine fuel return pipe. (8) remove/discard Fuel Pressure Regulator inlet O-ring (9) Check Fuel Pressure Regulator filter screen for contamination - if contaminated, replace Fuel Pressure Regulator. (10) Lubricate new Fuel Pressure Regulator inlet O-ring with clean engine oil & install onto the Fuel Pressure Regulator inlet. (11) Install the fuel return pipe onto the Fuel Pressure regulator (12) Install new retainer & spacer bracket into the slot on the fuel rail.
(13) Install Fuel Pressure Regulator onto Fuel Rail & tighten Engine Fuel Return Pipe nut to 13 ft-lbs (17 Nm). (14) connect Fuel Pressure Regulator vacuum line, (15) Install Fuel Pressure Regulator attachng screw & tighten to 76 in-lbs (8.5 Nm). (16) Inspect & verify that retainer & spacer bracket is engaged in the slots on the fuel rail. Grasp & pull on the Fuel Pressure Regulator.
to ensure that the Fuel Pressure Regulator is properly seated. (17) inspect for fuel leaks with this
procedure: On 2sec,(holy rollers), off 10sec will be left on, inspect for leaks while running.

Dec 11, 2010 | 2000 Pontiac Montana

1 Answer

I have a 2004 Tahoe which has misfire problems (P0300). I changed the plugs, wires, fuel filter and air filter but problem still exist. The 4 plugs on the passenger side continue to file out and become...


Removal & Installation of fuel Regulators on
4.8L, 5.3L & 6.0L Engine To Remove:
CAUTION
Three styles of fuel pressure regulators and fuel rails will be used in this model year. Each regulator has a different "footprint" that consequently changes the size of the receiving port in the fuel rail. The regulator retaining clips are specific to each rail-regulator design and cannot be interchanged.
chevy_aval15_02-04_fuelrail.gif

  1. Remove the engine sight shield.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
  3. Clean the fuel pressure regulator retainer and the surrounding area.
  4. Remove or disconnect the following:
    • Fuel pressure regulator vacuum line.
    • Fuel pressure regulator retainer.
    • Fuel pressure regulator.
  5. Remove the following parts from the fuel rail:
    • Backup ring (10)
    • Regulator Seal O-ring (11)
    • Regulator filter (12)
    • Regulator seal O-ring (13)
To Install:
chevy_aval15_02-04_retainer.gif

  1. Make sure the NEW fuel pressure regulator retainer is the right one.
  2. The tabs (1) are used on the straight vacuum port retainer (2), and the E85-straight vacuum port retainer (3).
  3. The angle vacuum port retainer (4) has no tabs. chevy_aval15_02-04_fuelrail.gif

  4. Install the following parts onto the fuel pressure regulator (9).
    • Backup ring (10)
    • Regulator seal O-ring (11)
    • Regulator filter (12)
    • Regulator seal O-ring (13)
  5. Lubricate the fuel pressure regulator O-rings with clean oil.
  6. Install the fuel pressure regulator and retainer. CAUTION
    Whenever the fuel pressure regulator is removed from the fuel rail NEW O-rings and a NEW retaining clip should be used on reinstallation.
  7. Connect the vacuum line.
  8. Tighten the fuel filler cap.
  9. Use the following to inspect for leaks:
    • Turn ON the ignition, with the engine OFF, for 2 seconds.
    • Turn OFF the ignition for 10 seconds.
    • Turn ON the ignition, with the engine OFF.
    • Install the engine sight shield.
8.1L Engine To Remove:
Fuel pressure regulator vacuum line gm_trk_sub15_fuel_press_reg_vac_line.gif

  1. Before servicing the vehicle refer to the precautions at the beginning of thjs section
  2. Remove the fuel injector sight shield as needed
  3. Relieve fuel system pressure (See: Fuel Pressure Relieving)
  4. Disconnect the fuel pressure regulator vacuum line (A) 8.1L Fuel pressure regulator retainers gm_trk_sub15_81l_fuel_press_reg_retainers.gif

  5. Clean any dirt from the fuel pressure regulator retainer and the surrounding area
  6. Remove the fuel pressure regulator retainer (I)
  7. Remove the fuel pressure regulator (H) from the fuel pressure regulator housing
To Install:
8.1L Fuel pressure regulator retainers gm_trk_sub15_81l_fuel_press_reg_retainers.gif

  1. Install or connect the following:
    • Backup ring (J) on the fuel pressure regulator (H)
    • New large O-Ring (K) on the fuel pressure regulator
    • Regulator filter (L) on the fuel pressure regulator
    • New small O-Ring (M) on the fuel pressure regulator
  2. Lubricate the fuel pressure regulator large O-Ring and the small O-Ring with clean engine oil
  3. Push the fuel pressure regulator onto the regulator housing on the fuel rail
  4. Install a new fuel pressure regulator retainer (I)
  5. Install or connect the following:
    • Fuel pressure regulator vacuum line
    • Negative battery cable
  6. Tighten the fuel filler cap
  7. Inspect for leaks using the following procedure:
    • Turn on the ignition with the engine off for two seconds
    • Turn off the ignition for 10 seconds
    • Turn on the ignition with the engine off
    • Inspect for fuel leaks
  8. Install the fuel injector sight shield
  9. Road test the vehicle to check performance
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Sep 02, 2010 | Chevrolet Tahoe Cars & Trucks

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

Fuel pressure low at pressure monitor


HI. There are some areas that will need to be checked for faults, in this case. Check the following:

1. Fuel filter- If this device is clogged, or faulty, it will decrease the flow of fuel to the injector assembly. If the filter hasn't been changed recently, this will be a good place to start.

2. Fuel pump- This device may be weak, or grounded poorly. check the ground, and all wires the link the pump to the power source. replace any corroded contacts and connectors. wires,as well, if needed.

3. Fuel pressure regulator- The fuel pressure regulator is used to keep the fuel pressure in the fuel rail consistent and change the fuel pressure depending on the throttle position. The fuel rail is in a fuel loop between the fuel pump feed and return lines. Because the fuel delivery requirements change depending on the engine's throttle position and engine loads, the fuel injection system must be able to adapt to meet the fuel requirements of the engine's operating conditions during idle, acceleration and steady cruising.The fuel pressure regulator has a small vacuum line attached to it that allows the pressure regulator to change the fuel pressure in the fuel loop depending upon the intake manifold pressure which changes as the throttle position changes. When the throttle is opened, the manifold vacuum pressure drops off, causing the pressure regulator to increase the fuel pressure in the fuel loop, which increases the amount of fuel delivery at the injectors to provide for the additional fuel needed for the engine to operate properly.At idle, the manifold vacuum increases and the demands for the rate of fuel delivery are decreased so the pressure regulator decreases the fuel pressure in the fuel loop.

1. Look for visible evidence of fuel leaks.
2. A pressure regulator can become defective due to foreign material or a ruined diaphragm.


The result will be hard starting, poor idle quality, and lack or power. Burned spark plugs can result from operating with a lean air/fuel mixture, as well. replace this device if faults exist.

Nov 18, 2009 | 2001 BMW 330

1 Answer

I suspect fuel pump problem how do I check fuel pressure, what tools do I need


There should be a Schrader valve on the fuel rail (looks like a valve stem on a tire, it is metal).

You need to connect a fuel pressure gauge to that valve and do the following test:

  1. Relieve fuel pressure.
  2. Remove the 12 mm sealing nut from the fuel rail. Attach the fuel pressure adapter nut, 12 mm (90201 - P0A - 003) and the special tool.
  3. Start the engine. Measure the fuel pressure with the engine idling and the vacuum hose of the fuel pressure regulator disconnected from the fuel pressure regulator and pinched. If the engine will not start, turn the ignition switch on, wait for two seconds, turn it off, then back on again and read the fuel pressure. Pressure should be: 260 - 310 kPa (2.7 - 3.2 kgf/sq.cm, 38 - 48 psi)
  4. Reconnect vacuum hose to the fuel pressure regulator. Pressure should be: 210 - 250 kPa (2.1 - 2.8 kgf/sq.cm, 30 - 37 psi) If the fuel pressure is not as specified, first check the fuel pump. If the fuel pump is OK, check the following:
    • If the fuel pressure is higher than specified, inspect for:
    • Pinched or clogged fuel return hose or line.
    • Faulty fuel pressure regulator.
    • If the fuel pressure is lower than specified, inspect for:
    • Clogged fuel filter.
    • Faulty fuel pressure regulator.
    • Fuel line leakage.

Jul 27, 2009 | 1997 Honda Accord

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