Question about 1996 Buick LeSabre

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The location of fuel pressure test connection on 2.2 4cyl engine

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On top motor in rear near fire wall should have a cap on it like a wheel valve stem

Posted on Jan 04, 2011

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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

Hard starting


Do a fuel pressure leak down test, the test port is located on the fuel rail that supplies fuel to the injectors on the top of the engine, the pressure should not drop more than 5 PSI after the engine is shut down, make sure the fuel gauge (special tool) is not leaking at the schrader port connection. If the fuel pressure leaks down right away you need to replace the fuel pump inside the fuel tank, it has a defective pressure check valve. I understand you can buy a universal test gauge from most parts stores for about $20.00 that hooks up to the above mentioned test port.

Oct 10, 2012 | 1994 Jeep Grand Cherokee

1 Answer

Sounds like the fuel pump is going or gone out and it trys to start but it wont turn all the way over


By what your stating, that it starts and dies every time, It seems to be fuel related. You need to perform a fuel pressure check. You will need a pressure tester, one that would at least be able to read pressure to a maximum of 150 lbs of pressure. Although you really only need about 50-60 pounds of pressure to maintain proper fuel injector operation. There is a test port located on the fuel rail where you would conect the pressure tester. The test port is usually located on the drivers side of the engine near the rear section coming up from the firewall. Unscrew the pressure port cap if its still there and connect your tester. But also keep in mind you may have fuel pressure of some sort in the rail so be careful. While the tester is screwed to the test port you want to cycle the ignition key on and read pressure, you may want to repeat this several times. You must have at least 50 pounds of pressure, if so it should start. If you are losing pressure while your maintaining a visual check on the tester it could also be a faulty pressure regulator/fuel pump or even a rubber hose connection inside the fuel tank that connects the fuel pump to the fuel line. If you have any questions Im here to help. Thanks for using FIXYA

Feb 22, 2011 | 1996 Chevrolet Cavalier

1 Answer

2002 chevy silverado starts right up but then dies right away starts right up again but dies


By what your stating, that it starts and dies every time, It seems to be fuel related. You need to perform a fuel pressure check. You will need a pressure tester, one that would at least be able to read pressure to a maximum of 150 lbs of pressure. Although you really only need about 50-60 pounds of pressure to maintain proper fuel injector operation. There is a test port located on the fuel rail where you would conect the pressure tester. The test port is usually located on the drivers side of the engine near the rear section coming up from the firewall. Unscrew the pressure port cap if its still there and connect your tester. But also keep in mind you may have fuel pressure of some sort in the rail so be careful. While the tester is screwed to the test port you want to cycle the ignition key on and read pressure, you may want to repeat this several times. You must have at least 50 pounds of pressure, if so it should start. If you are losing pressure while your maintaining a visual check on the tester it could also be a faulty pressure regulator/fuel pump or even a rubber hose connection inside the fuel tank that connects the fuel pump to the fuel line. If you have any questions Im here to help. Thanks for using FIXYA

Feb 22, 2011 | 2002 Chevrolet Silverado

1 Answer

I have a 2000 f250 5.4 it will turn over but not start.i have power coming from battery checked senors 5 an 7 are the ones that ive found to be the promblem i have only 18 pounds of fuel pressure fuel pump...


i got new pcm to ???? Was it programmed ? Dealer ! checked senors 5 an 7 are the ones that ive found to be the promblem ?????????? What are sensors 5 & 7 ? 2000 PCED On Board Diagnostics II SECTION 5: Pinpoint Tests Procedure revision date: 01/07/2003 A: No Start A: Introduction A1 CHECK PASSIVE ANTI-THEFT SYSTEM (SECURILOCK)
    Note: This vehicle may have an anti-theft system, which may be activated, causing the no start condition. Verify by viewing anti-theft indicator light on instrument panel or a Diagnostic Trouble Code (DTC P1260) may be present.
  • Verify anti-theft system.
Is the system activated?
Yes No REFER to Electrical Anti-Theft, Section 419-01 in the Workshop Manual for diagnosis and testing. GO to A2 . A2 ATTEMPT TO CRANK ENGINE
    NOTE: Verify inertia fuel shutoff (IFS) switch is set (button pushed in). Refer to Owner Guide for location. Does engine crank?
    Yes No GO to A3 . REFER to the Starting Systems, Section 303-06 in the Workshop Manual. A3 IDENTIFY TYPE OF NO START
      NOTE: The purpose of this Test Step is to identify intermittent No Starts in order to guide the technician to the proper repair procedure. Does the vehicle start now?
      Yes No Vehicle is an intermittent No Start. GO to Z2 . Natural gas vehicles:

      KEY OFF. GO to HA47 .

      All others:

      KEY OFF. GO to A4 . A4 CHECK VREF VOLTAGE TO THROTTLE POSITION (TP) SENSOR
      • Disconnect TP sensor.
      • Key on, engine off.
      • Measure voltage between VREF and SIG RTN circuit at the TP sensor harness connector. GO to Pinpoint Test DH to refer to the schematic.
      Is voltage between 4.0 and 6.0 volts?
      Yes No KEY OFF. RECONNECT TP sensor. GO to A5 . KEY OFF. GO to C1 . A5 CHECK FEPS CIRCUIT FOR SHORT TO POWER IN HARNESS
      • Key on, engine off.
      • Measure voltage between Pin 13 at the data link connector and battery negative post.
      • (Refer to the Wiring Diagrams for connector location.)
      Is voltage greater than 9.0 volts?
      Yes No REPAIR short to power. For coil-on-plug vehicles:

      KEY OFF. GO to A17 .

      All others:

      KEY OFF. GO to A6 . A6 CHECK PIP IN THE PCM
        Note: The scan tool must be connected to a reliable power source that is powered with the key in the START position (such as directly to the vehicle battery). Also verify that the vehicle battery is fully charged.
      • Access PIP PID.
      • While viewing the PIP PID, crank engine.
      Is the PIP PID switching on and off?
      Yes No KEY OFF.

      For 2L engines : GO to JD1 .

      For all others : GO to JB1 .

      If OK: Natural Gas Vehicles : GO to A9 .

      If returning from another pinpoint test or all others:

      GO to A7 . KEY OFF. GO to JD1 . A7 CHECK FUEL PRESSURE
        WARNING: BEFORE SERVICING OR REPLACING ANY COMPONENTS IN THE FUEL SYSTEM, REDUCE THE POSSIBILITY OF INJURY OR FIRE BY FOLLOWING DIRECTIONS IN PINPOINT TEST HC WARNING, CAUTION, AND HANDLING.
      • Release the fuel pressure.
      • Install fuel pressure tester.
      • Scan Tool connected.
      • Key on, engine off.
      • Enter Output Test Mode (refer to Section 2 ) and run the fuel pump to obtain maximum fuel pressure.
      Is fuel pressure at the specified pressure (use the fuel pressure chart in Pinpoint Test HC)?
      Yes No GO to A8 . KEY OFF. GO to HC1 . A8 CHECK FUEL PRESSURE LEAKDOWN
      • GO to Pinpoint Test HC and observe WARNING, CAUTION AND HANDLING.
      • Fuel pressure tester installed.
      • Scan Tool connected.
      • Key on, engine off.
      • Access Output Test Mode and run fuel pump to obtain maximum fuel pressure.
      • Exit Output Test Mode.
      • Verify fuel pressure remains within 34 kPa (5 psi) of the maximum pressure for 1 minute after turning pump off.
      Does fuel pressure remain within 34 kPa (5 psi)?
      Yes No KEY OFF. GO to A9 . KEY OFF. GO to HC1 . A9 CHECK FUEL INJECTORS FOR VPWR
        Note: Check at least two fuel injectors, one on each bank. A no start condition can exist only if greater than 50% of the fuel injectors are without VPWR.
      • Disconnect any two fuel injectors.
      • Key on.
      • Measure VPWR circuit voltage at fuel injector harness connector.
      Is voltage greater than 10.5 volts?
      Yes No Natural Gas Vehicles:

      GO to A15 .

      KEY OFF. GO to A10 . REPAIR VPWR circuit. A10 CHECK FUEL INJECTORS ABILITY TO DELIVER FUEL
      • Connect fuel pressure gauge to Schrader valve.
      • Cycle key several times.
      • Locate and disconnect the inertia fuel shutoff (IFS) switch.
      • Monitor pressure gauge while cranking the engine for at least five seconds.
      Is there a pressure drop greater than 34 kPa (5 psi) while cranking the engine?
      Yes No The electronic engine control system is not the cause of the no start. RETURN to Section 3 , Symptom Chart for further diagnosis. REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). A15 CHECK FUEL PRESSURE ON NATURAL GAS VEHICLES
      • Connect scan tool to DLC.
      • Access FRP PID (fuel pressure).
      • Record fuel pressure.
      • Connect fuel pressure gauge to Schrader valve.
      • Key on, engine off.
      • Record fuel pressure.
      Is fuel pressure between 552 and 827 kPa (80 and 120 psi) on the Scan Tool and fuel pressure gauge?
      Yes No KEY OFF. GO to A16 . KEY OFF. GO to Fuel Systems, GO to HB1 . A16 CHECK INJECTOR SIGNAL FROM NGV MODULE
        Note: This test requires a standard 12 volt test lamp. A properly operating system will show a dim glow.
      • Connect test lamp between the injector signal circuit and VPWR circuit pin at the injector harness.
      • Crank engine.
      Does test lamp have a dim glow while cranking?
      Yes No REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). GO to A6 . No light or continuously bright light.GO to HA47 . A17 CHECK PCM DRIVER TO COILS
      • Connect incandescent test lamp between B+ and each coil driver circuit at the harness connector.
      • Crank engine.
      Does lamp blink consistently and brightly (one blink per engine revolution)?
      Yes No KEY OFF. GO to A7 . KEY OFF. GO to JD1 .

Jun 04, 2017 | 2001 Ford F250 Super Duty Super Cab

1 Answer

Starting car is problem. it will start after maybe two trys. i have tried engine cleaner, but still it is slow starting,. battery is good, thats been checked.


When you have an engine that is hard to start or the engine takes longer than normal to start, with a fuel injected engine it will normally be caused by a fuel problem. Another problem would be slow cranking of the engine because of a low battery, I would check all of the fuel related problems if the engine seems to crank normally. There are a few things to check. First pull the fuel filter off and wipe it off so you don't get gas in your mouth and try to blow through one of the fuel connections on the filter. If you can't blow through it the filter is pluged and needs to be replaced. A plugged fuel filter can cause hard starting and can also damage your fuel pump. The next thing to do when everything is put back on the car is to check the fuel system for bleed down. You need to locate the fuel pressure test connection on the engine. Connect a fuel pressure gauge to the connection and start the engine, then turn the ignition off. With the engine off the pressure should read and stay between 30psi and 40psi, to be sure of the pressure you will have get the spec's on the engine you have. The main thing you will be looking for is to make sure the pressure doesn't start bleeding down in to direction of zero after a few minutes or maybe even immediately. If you see the pressure start to bleed down you have a problem. There are two problems that normally cause the pressure to bleed down. One is a bad check valve in the fuel pump, the other is a bad fuel pressure regulator. The main thing that happens with a fuel pressure regulator is the diaphram inside starts leaking. When that happens sometimes it will leak fuel into the intake manifold through the vaccuum hose connection to the intake manifold. To check for a fuel leak through the vacuum hose connection, locate the vacuum hose on the fuel pressure regulator and pull the hose from either the manifold connection or from the connection at the fuel reguator. If you see any gas at all the fuel regulator is leaking and must be replaced. If it is a slow leak from the regulator you might have to start the engine with the vacuum hose disconnected and look for a leak from the hose. If you don't find anything wrong with the regulator the next problem area would be fuel pressure bleeding back into the gas tank because of a bad check valve in the fuel pump. If this is the problem the fuel pump would have to be replaced. My first guess as to what is causing your problem would be the fuel pressure regualtor although I would definately want to make sure the fuel filter is not plugged. (Please Note) The fuel pressure regulator is located in the intake manifold area of the engine. The fuel pump is located in the gas tank. The fuel filter is located usually somewhere under the car.

Aug 24, 2010 | 2001 Pontiac Grand Am SE

1 Answer

WHAT IS THE FUEL PRESSURE SUPOSE TO BE ON A 98 GRAND CARAVAN


The fuel pressure should be 49 psi. On all engines except the 3.0 liter you can check the fuel pressure at the fuel pressure test port located on the fuel rail. On the 3.0 liter engine you can disconnect the quick-connect fuel line fitting at the fuel rail and install a fuel gauge with a (T) fitting and adapters to check fuel pressure. Start the engine and check the fuel pressure. Hope this will help.

May 24, 2010 | 1998 Dodge Caravan

1 Answer

2000 sl2 is hard to start and keep running esp when car has set for awile also has a misfre esp at idle seems less noticable when rpms are increased also seems to take a while to idle down when braking(has...


in order to diagnose problems like this much more info is needed, have you tested the electronic engine controls for trouble codes? (u will need to have the system scanned to find out these codes) if so what are those codes? the next test is to make sure the fuel pressure is not leaking down due to a defective fuel pressure check valve in the electric fuel pump located in the fuel tank, this will cause the engine to run poorly when first started, to test this u will need to buy a fuel pressure test guage tool for your car, the test port to measure pressure is on the top of the engine in the pipe that feeds fuel to the injectors, it looks like a big tire valve with a plastic cap on it, to test for fuel pressure leak down hook up the gauge and run the engine, you should have about 55-60 PSI at idle, make sure the gauge connection doesn't leak, then shut the engine off, the pressure should not drop by more than a few pounds of pressure, if it drops more than 5 PSI then u need to replace the fuel pump.

Sep 02, 2009 | Saturn SL2 Cars & Trucks

3 Answers

94 Old Cutlass Ciero 3.1 engine starts and dies won't stay running


Replace the oil pressure switch next to the oil filter. When you turn on the ignition the fuel pump runs to prime the system then turns off. Then the oil pressure switch runs the fuel pump to keep the engine running. To test, connect the fuel pump test wire(located at the left front wheel well) to the battery. This will bypass the pressure switch and the engine should run.

Jul 12, 2009 | 1994 Oldsmobile Cutlass Ciera

1 Answer

Where is the fuel filter located for Buick Century 2001


The fuel filter is located underneath the car in front of the gas tank.
You have release the fuel pressure. Remove the fuel filler cap, locate the fuel test port on the fuel rail on the passenger side on the end of the right real fuel rail for a 3.1L engine.
3.8L engine yhr test port is located at the pressure regulator under the trim cover.

Aug 27, 2008 | 2001 Buick Century

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