Question about 1989 Jeep Comanche

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My engine stalls intermittently. It appears to be a fuel supply problem. I've installed fuel pressure gauge that reveals that the pressure is steady, even when the engine stalls. What do I test next and how?

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Will be more helpful if you describe in more details; how often and if is at idle or when driving?
if you suspect fuel,did you try fuel filter?

Posted on Oct 16, 2008

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94 z28 chevy camaro fuel pressure check valve location and is there any other names for this item I recently installed a stock replacement fuel pump in my camaro I run 35psi which is low at idle unplug the...


do you mean the pressure relief valve, this is located normally on the low pressure or return side of your fuel rail, this is designed to maintain fuel pressure in your fuel rail constant, e.g. steady running requires steady pressure, acceleration requires increased pressure controled by engine vacuum, if it was on the supply line you can not regulate the pressure supplied to the injecters. stopped engine requires no pressure so the pump gets turned off with the ignitionf

Nov 27, 2013 | Cars & Trucks

1 Answer

Engine starts then stalls, is it the fuel pressure reg or injector(s)?


Generally speaking, too much pressure should not cause any problems. The injectors should be able to open and close. Its possible there is a blockage in the return line to the tank and that is causing the pressure or flow in the main line to drop but I doubt it.
Have you checked pressure with a gauge yet ?

Jul 13, 2013 | 1987 Nissan Pathfinder

1 Answer

'05 ford escape - car won't start if fuel below 1/4 tank


Not sure about P0195, but P093 is for a problem with the fuel rail pressure sensor. The sensor could be faulty or it could be accurate when the fuel system is empty.
Your sending unit for the fuel gauge could be off. Can you check the amount of fuel it takes to fill the tank when the gauge reads half ? If the gauge is right it should take half of the capacity of the tank to fill it up.

Dec 06, 2012 | 2005 Ford Escape

1 Answer

I've had sender replace and all points between there and oil gauge verified OK and all the stepper motors on instrument cluster replaced but still get fluctuating oil pressure needle and warning s


If you check the oil pressure with a mechanical gauge and the pressure is steady, the problem would be in the gauge on the dash if you have replaced the sending unit and there are no problems with the circuit.
The mechanical gauge could verify a problem with the actual pressure in the engine.

Aug 22, 2012 | Cars & Trucks

1 Answer

When I crank up the car it want stay crank & when it do stay crank it goes u & down. What is the problem?


Hi,

Improve the Fixya.com experience for everyone by voting!

The steps I'm going to outline are the same as we use in my shop for hesitation, sag and stumble.

All of the tools required can be borrowed from AutoZone at NO COST!

Sensors:

  • The sensors can be checked with an OBD-II code scanner borrowed from AutoZone. Pay special attention to an TP (Throttle Position) warnings. The sensor can be manually checked for binding or sticking.
  • Check the Heated Oxygen Sensor (HO2S) found near the firewall and screwed into the exhaust manifold for signs of corrosion on the threads. That will cause a faulty ground.


Fuel System:

  • Check the fuel pressure with that fuel pressure gauge from AutoZone. You reading should be 40-45 PSI and holding steady.
  • Contaminated fuel is a constant problem and if the pressure does not hold steady, replace the fuel filter.



Additional Checks:

  • Make certain that the engine thermostat is functioning and is the correct temperature.
  • Make certain that the alternator voltage output is not less than 9 volts nor more than 17 volts.


Here's a little general information that will assist you in comprehending the readouts from the code scanner. This is simply for your edification. You may be aware of all this but we've never done business before and all assumptions are off the table.

For an engine - make that any engine and irrespective of manufacturer - to run, you need three things to happen inside the engine, compression, fuel and ignition, without any one of these components the engine will not run.

  • Compression - Engine compression caused by crankshaft rotation and pistons moving up and down inside the engine block. If the timing belt or timing chain fails it will cause the camshaft to become out of correlation with the crankshaft or allow the camshaft to stop rotating. Either of these conditions will cause the engine to lose compression and sometimes cause internal engine damage.
  • Fuel Delivery System - The fuel system includes: fuel pump, fuel injectors, pressure regulator, fuel filter and pressure lines. This system is used to supply fuel under pressure to the fuel injection system, the lack of fuel pressure or volume will cause the fuel delivery system to fail and the engine to stall or not start.
  • Ignition Spark Delivery System - The ignition system components include: spark plugs, spark plug wires, distributor (if applicable), crankshaft angle sensor, camshaft angle sensor, ignition coil, ignition module, knock sensor and PCM (powertrain control module). The engine relies on the ignition spark to be delivered to the combustion camber at the correct time. If the ignition spark stops or is delivered at the wrong time the engine will not run or run poorly.

The Wells Company offers extensive code diagnosis application information and technical support via its Tech Line at 1-800-558-9770, as well as in-depth product and repair videos at www.repairpath.com (use mny personal access code carrepair) and through the "Wellstech" channel at www.YouTube.com

Ben

Jun 13, 2011 | 2000 Ford Escort

1 Answer

Replace fuel inj 2009 lincoln ls 3.9 eng


Check this procedure about V8 3.9L Fuel Injectors - Removal & Installation
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2. Relieve fuel system pressure.
  3. Remove or disconnect the following:
    Negative battery cable Engine appearance covers Fuel lines Fuel pressure regulator Fuel cross over elbow Fuel injector connectors Fuel injector clamping plates Fuel injectors
To install:
  1. Install or connect the following:
    Fuel injectors. Use new O-ring seals. Fuel injector clamping plates Fuel injector connectors Fuel cross over elbow Fuel pressure regulator Fuel lines Engine appearance covers Negative battery cable
  2. Start the engine and check for leaks.

  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2. Disconnect the negative battery cable.
    CAUTION The engine appearance cover is equipped with a noise suppressor. If the noise suppressor becomes separated from the engine appearance cover it must be positioned on the intake manifold prior to installing the engine appearance cover.
  3. Remove the engine appearance cover and the noise suppressor, if detached.
  4. Remove the air cleaner outlet pipe.
  5. Release the fuel system pressure.
  6. Remove the four engine appearance cover mounting bracket nuts and the brackets.
  7. Disconnect the fuel pressure sensor electrical connector from the sensor.
  8. Disconnect the fuel pressure sensor vacuum connector from the sensor.
  9. Disconnect the eight fuel injector electrical connectors from the injectors.
  10. Disconnect the fuel temperature sensor electrical connector from the sensor.
  11. Disconnect the fuel supply tube retaining clip from the fuel injection supply manifold.
  12. Disconnect the fuel supply tube spring lock coupling.
  13. Remove the four bolts and the fuel injection supply manifold and fuel injectors as an assembly.
  14. Remove the fuel injectors from the fuel injection supply manifold.
    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.
  15. Remove and discard the 16 O-ring seals from the fuel injectors.

    zjlimited_467.jpg

    Fig. Exploded view of the fuel injector mounting-3.9L engine shown

To install:
  1. Lubricate the new fuel injector O-ring seals with clean engine oil before installing.
    CAUTION Use O-ring seals that are made of special fuel-resistant material. Use of ordinary O-rings can cause the fuel system to leak. Do not reuse the O-ring seals.
  2. Install sixteen new O-ring seals onto the fuel injectors. Lubricate the O-ring seals with clean engine oil prior to installation.
  3. Install the fuel injectors and clips onto the fuel rail.
  4. Install the fuel rail and injectors as an assembly. Tighten the fuel rail bolts to 89 inch lbs. (10 Nm).
  5. Install the remaining components in the reverse order of removal.

Keep us updated.

Jan 14, 2011 | 2002 Lincoln LS

1 Answer

1985 cabrio stalls at about 1 hour into my commute


hi,

put in on a vacuum gauge and watch it untill warm up. the gauge should be steady all throughout the idle and when you punch it. sounds like an intermittent vacuuum leak. listen for hissing in the engine comparment. put it on a scanner if it keeps it up. its time for new vacuum lines.

jm

Dec 03, 2009 | 2005 Volkswagen Microbus

1 Answer

Appears that fuel pressure is lost occassionally to the engine and will not start, could this be an intermittent problem with the fuel pump relay?


very possibly yes....could also be a mechanical leakdown on the pump itself in the tank....best test would be to do a mechanical pressure gauge and see the fuel pressure drop with applied power to it or not

Nov 14, 2009 | 1999 Mercury Cougar

1 Answer

2000 Chevy blazer this is the 2nd brand new fuel pump I've replaced in 2 weeks,It runs a hour or two, Then sitting all night won't work in the morning.Same thing the first time . I've checked fuse ,...


Spark......EQUIPMENT NEEDED: 1) fuel pressure Gage....Advanced Auto = $45..... 2) needle nose pliers ( fuse pull )..
There is a fuel pressure access valve located on the fuel injector rail. The access port or "shraider" valve has a black or gray screw on cap. Remove the cap and you will see the valve. CAUTION: The fuel rail is under pressure....before installing the pressure gauge, relieve pressure by starting the engine and removing the fuel pump fuse from the under hood fuse box......
Once the engine quits, turn the key to the off position and safely install the pressure gauge. Put a rag around or under the access valve to catch any drizzling fuel. I always prefer to do this when the engine is cool.
Install the pressure gauge, start the engine, check for leaks and read pressure output at idle, record pressure reading.
Also, it should be checked under load but you will need another person to help.
Once you have shut the vehicle off watch the pressure gauge, it should remain steady and not leak down.
Let me know what the readings are.
Regards,

Feb 13, 2009 | 2000 Chevrolet Blazer

1 Answer

1998 Pontiac Sunfire won't accelerate


I assume that you do not have a "check engine" light?

The next thing I would do is check the pressure from the fuel pump. You can have this done at your preferred garage, or by purchasing a fuel pressure gauge from any parts store.

Vent the fuel tank vapors by loosening the fuel cap. Remove the electric fuel pump fuse and start the engine. Allow the engine to run until it runs out of fuel and stalls. After spinning the engine over for a period of 3 to 5 seconds, turn off the ignition switch and install the electric fuel pump fuse. Next, install a fuel pressure gauge in the fuel rail supply line, and secure the fuel tank cap. With the ignition key in the on position, verify that no leaks are present and start the engine. Visually verify the PSI reading on the gauge. The pressure for your vehicle should be 41-47 PSI (Pounds per Square Inch). Hope this helps and good luck!

Jan 13, 2009 | 1998 Pontiac Sunfire

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