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Where to test for fuel pressure - Maxima Nissan Cars & Trucks

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The easiest place to test for fuel pressure is on the fuel rail underneath the hood on top of the motor iteslf.There is normally a schrader valve there to screw on to, or you can remove the fuel high pressure supply hose to get your fuel pressure reading.I hope I could help, rate me accordingly, Thanks.

Posted on Oct 10, 2010

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I have a 97 grand cherokee larado and when I shut it off it won't start back up for a few mins..then it fires up...is there a kill switch on it or something else wrong possibly


No kill switch. You may have a fuel pump pressure issue, it may being losing pressure after shut down due to a faulty fuel pump check valve. Do a fuel pressure leakdown test, start the engine with a fuel pressure test gage hooked to the test port on the fuel supply rail to the fuel injectors, looks like a tire valve. Start the engine and run it and check for leaks at the pressure port to the test gage, repair as needed, once you are sure the test gage is leak free shut the engine down, if the fuel pressure bleeds down very quickly then you need to replace the fuel pump.

Apr 12, 2017 | 1997 Jeep Grand Cherokee

1 Answer

What should the fuel pressure be at idle


Fuel pressure on idle? - evolutionm.net

www.evolutionm.net/forums/ecuflash/585049-fuel-pressure-idle.html
Nov 22, 2011 - Hi, I have Detschwerks 300 fuel pump and stock fuel regulator. I have 35 psi (~2.4 bar) on idle (850 rpm). Shouldn't I have something like 43 psi ...

Fuel Pressure Test - YouTube

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https://www.youtube.com/watch?v=_oXLUqE4Sf0
Dec 29, 2013 - Uploaded by ChrisFix
Learn how to test your fuel pressure, how to test your fuel pressure regulator, ... If your car is idling or running ...

What should my fuel pressure be at idle through max rpm? - Hot Rod ...

www.hotrodders.com > Tech Help > Engine

Oct 20, 2008 - 11 posts - ‎8 authors
I have 3psi of pressure at idle. My fuel pressure gauge is under the hood so I cant see it when im driving. When im reving it up in park while ...

What should the fuel pressure be at idle? - Ford Mustang Forum



Jan 07, 2016 | Cars & Trucks

1 Answer

How can I check the fuel presure in Toyota tacoma engine 2.4


Sorry am not sure whether Tacoma engine is petrol or diesel, what age it is or what fuelling system but assuming it is a conventional petrol injection system, the fuel pressure test is just one of four tests carried out when a problem with fuel delivery is suspected and begins with fitting the appropriate adaptors to the fuel line and then fitting a pressure gauge.

It is not just the correct fuel pressure(s) needed for satisfactory engine performance but also sufficient fuel volume.

Before carrying out the tests is is usually necessary to fit a switch in place of the fuel pump relay so the pump can be started with an open line and the engine switched off. The amount of fuel delivered into an appropriate container in a set time is measured and compared with specs.

The next test is the peak pressure test - a momentary test with a closed fuel line to test the mechanical strength of the pump and lines.

The next test is the regulated pressure test with the fuel line again connected to the engine and the enriched pressure recorded and compared with specs and finally the engine is started or vacuum applied to the regulator valve with a hand pump and the lean or normal pressure is recorded.

With some older engines it is possible to easily install a pressure gauge with universal adaptors but as later engines tend to use quick release fittings an number of special adaptors will be needed.

Sep 13, 2015 | Toyota Cars & Trucks

1 Answer

Why dont my car pick up


You mean it has no power on acceleration ? plugged catalytic converter ! , maybe plugged fuel filter , low fuel pressure ! Fuel pressure regulator bad ! Test fuel pressure an do an exhaust back pressure test ! Fuel Pressure Test Testing for plugged clogged restricted exhaust converter

Mar 18, 2015 | Cars & Trucks

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

2 Answers

How to check fuel pressure 91 geo storm gsi


1.6L DOHC (same way as the ISUZU impulse ) same car.
4XE1 engine twin cam.
has MPI injection with fuel rail, regulator and loop
disconnecting the feed line and stuffing it with guage only does 1 of 5 tests. done on MPI. it does JUST the shut test.
the correct way it to check it at the filter or rail tests ports on most cars.
in some cases you must add it.
they sell banjo fittings with test ports at summit racing dot com.
so the first question on all MPI cars, is , where is the stock fittings.
other cars the rail has a schrader valve or a plugged hole to add one. (test port) did you look first for this?
to test the FPR, unplug the vacuum line running
and pressure will jump up 6 to 10 psi.
this simulates wide open throttle pressure, a key fact in getting full power from engine, i test cranking presssure, idle, 3000rpm
and wot pressures to be sure the PFR is working, not just the pump.



the spec at the rail is.

Late 1986 to 1993 I-TEC MPFI system (after VIN 0908197)
Regulator vacuum line connected-36 psi
Regulator vacuum line disconnected-42.5 to 45 psi

the shunt test can hit 60 pis easy. do so for only 5sec.
as this stresses the pump .

the only rail drawing , shows no fittings (cheap buggers)



not even a cheap plug...

24024302-wtht4tipiqsxmsfaksxjx4vs-4-0.jpg below is the twin cam, 1.6L
buy a TEE feeting, and put it at upper, red arrow.
use clamps rated for fuel injection, not chezzy screw band clamps as seen on carb cars. use the correct parts.
or you will get leak and it will not be pretty,
the filter as at 14 ID. this is the pressure feed side of the loop.
30 to 60psi , so all parts must be rated over 60, psi, (100psi is a nice goal)

24024302-wtht4tipiqsxmsfaksxjx4vs-4-1.jpg

now the words directly from the IMPULSE FSM.

Testing
  1. Relieve the fuel pressure.
  2. Disconnect the fuel line near the engine and install fuel pressure gauge T-connector in the line.
  3. Connect the fuel pressure gauge to the T-connector.
  4. Start the engine and check the fuel pressure, it should be:
  5. 4XC1-Turbo and DOHC I-Mark, G200Z Impulse: 35.6 psi with the vacuum hose of the pressure regulator disconnected and plugged. 28.4 psi with the vacuum hose connected and at idle.
  6. 4ZC1-Turbo, 4ZD1 Impulse and 4ZE1 engine: 42.6 psi with the vacuum hose at the pressure regulator disconnected and plugged. 35.6 psi with the vacuum hose connected at idle. Disconnect the VSV before checking pressure.
  7. V6 engine: 9.13 psi at the fuel pressure line after the fuel filter.
  8. 4XE1 SOHC and DOHC engine: Flow test, disconnect the hose from the EFI fuel feed line at the engine and place in a suitable container. Apply battery voltage to the fuel pump. Pump should supply 1/4 quart (0.24L) within 15 seconds. Pressure test, connect a pressure gauge in the fuel pressure line after the fuel filter, located at the driver's side frame rail. Disconnect the vacuum hose from the pressure regulator. Apply battery voltage to the pump. After the pump stabilizes, the pressure should be 35-38 psi (245-256 kPa) and hold steady.

Apr 06, 2014 | Geo Storm Cars & Trucks

1 Answer

No test port on fuel rails


My fuel pressure set has an adaptor that installs where the fuel filter is to test pressure,may be able to rent one from auto zone or the like.

Jan 29, 2014 | Jeep Cars & Trucks

1 Answer

I have a 1988 suburban 1500 4x4 5.7 liter v8. I replaced fuel pump and filter, will start and run for about 10 seconds then die and will not restart. Not getting fuel somehow. Injectors were also replaced....


Most likely it is the fuel pressure regulator..also check for spark here's some info for you.. The first thing to do is check for spark.

Disconnect #1 ignition wire at the spark plug.
Install a spark tester into the end of the spark plug boot.
Have an assistant crank the engine over and check for spark at the tester.
Repeat this process at each spark plug.
If any cylinder does not show spark, proceed to secondary component tests.
If ALL secondary components show no spark, test components individually.
If all cylinders test O.K., inspect for fouled spark plugs and clean or replace as necessary.

2010-08-21_174426_1.jpg

If spark checks out good, then you could have a fuel delivery problem. I would recommend to start by checking fuel pressure. Fuel injected cars are very fuel pressure sensitive. Fuel pressure is very important and must be within specifications! But if the pressure is low, it does not mean the pump is bad. A plugged fuel filter, a pinched line, and low voltage at the pump can contribute to low fuel pressure. All three must be check before replacing the pump! You can get a fuel pressure gage at a local auto parts store for cheap.

Fuel pressure testing is frequently overlooked but it is one of the common causes of poor performance. The test procedure must include testing that will insure normal
fuel pressure under all operating conditions.

Key Factors

1. Fuel demands are low at idle.

2. Wide open throttle at high engine revs uses the most fuel.

3. Port injection fuel pressure must be reduced when manifold vacuum is high. Vacuum pulls fuel out of the injector causing it to deliver too much fuel if the pressure remains high. Manifold vacuum is used to open the pressure regulator at a lower pressure when vacuum is high.2010-08-21_175858_1.gif

Mar 31, 2013 | Cars & Trucks

1 Answer

How do you check fuel pressure


You will need to rent a fuel pressure gauge from the local parts store.
Locate the fuel pressure test port, you may have to refer to service information to locate this port or you may have to T into the fuel supply line.

  • 2 Cycle the ignition key "on" and check your readings, write this number down. Start the car and run it, record your fuel pressure reading again. If your performance problem occurs when driving then you will need to take a road test to record the fuel pressure when driving. Tape the gauge to the windshield and have an assistant watch the gauge while you drive.

  • Read more: How to Test Fuel Pressure On Your Car ' eHow.com http://www.ehow.com/how_2143018_test-fuel-pressure-cartest-fuel-pressure-car.html#ixzz29JWy4CdQ

    Oct 12, 2012 | 2002 Mitsubishi Galant

    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.
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    Oct 08, 2010 | 1997 Chrysler Concorde

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