Question about 1991 Chevrolet S-10

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91 2.5L losing fuel system prime

I have replace fuel pressure regulator, fuel sending unit in tank, electric fuel pump, all vacuum lines. I still have to pour a little gas in tb to start truck after I shut it off. What else can I look at?

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  • keith1961 Jun 15, 2008

    I tried turning the filter around. No change, still losing its prime when I shut engine off. The truck runs great once it is primed and started. I do have a problem with idling on occasion. It tends to idle low or high. Not all the time, just every now and then.

  • waterair Aug 06, 2008

    I'am having a starting problem with my S-10, it will start and idle for a few seconds then stall. after 3 or 4 attempts it will finally start and run fine, but has the same issue when i try to restart.it also bogs down at around 50mph it always has, I do regular maintenance on the vehicle according to factory recommendations and the starting problem just began 3 days ago.

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Ignition coil?

Posted on Jul 26, 2008

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  • Chevrolet Master
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You had put one or more of the filters on backwards
filters only work in one direct in and out check your filters and possibly turn them round how needed

Posted on Jun 07, 2008

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What would cause you to lose fuel pressure while driving.


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1 Answer

My fuel pressure goes to 60 pounds when the keys is turned on then starts dropping Is it my fuel pump or pressure regulator? 2004 GMC Yukon XL


Fuel pressure may drop due to a leaking injector or bad check valve in the fuel pump itself. The regulator does not come into effect until the engine is running and a vacuum supply is produced to it. If the regulator is leaking internally, it could send fuel back to the tank as well. Prime the fuel line and pinch off the return line ( if possible ) to eliminate a regulator problem. If the fuel pressure drops with the return line pinched off, suspect a leaking injector or fuel pump. If injector is leaking, the vehicle should run rich and cause a hard start/rough run condition

Jul 25, 2015 | 2004 GMC Yukon XL

1 Answer

2001 honda passport not getting fuel


First off, do you hear the fuel pump priming when you turn on the key. Should hear a light buzzing from the fuel tank for approx. 5 seconds. Have you opened the pressure line or the pressure test port on the fuel line on top of the engine to see if you are getting any fuel even trickling out especially during the priming. Pressure should be in the neighborhood of 45-50 psi for the system. A fuel pump can slowly fail, by losing pressure, but still can move some fuel if you hear it running oon the prime cycle. You can often borrow a fuel pressure guage from your local chain auto parts store to actually see what's goin on with the fuel system. You hook it up to the test port on the fuel rail and watch the pressure on the prime cycle. If it is very low, try priming the system 3 or 4 times to see if pressure builds, if not that would lead to testing the pressure regulator. But that's for next time.

Jul 22, 2012 | 2001 Honda Passport

2 Answers

I need change the fuel pump


Hi, The fuel pump is in the tank. You will have to remove the tank to get at it. Good luck

Jun 21, 2011 | 1995 Ford Windstar

1 Answer

How to replace fuel module regulator


to replace the fuel pump module.first you need to relieve the fuel system pressure.turn off radio first, then disconnect the negative battery cable.drain fuel from fuel tank.then then safely raise support car on jack stands. make sure sitting on solid level ground then remove the fuel charcoal canister hoses and vent line remove disconnect fuel pump. disconnect fuel pump electrical connector and remove fuel filler hose from fuel tank then remove the fuel tank from the vechicle.the heat shield and the rear exhaust system may have to be remove if you problem dropping the fuel tank.once fuel tank dropped you need snap ring pliers to remove the fuel pump module retaining ring.disconnect the fuel pump sending unit.disconnect the fuel pressure sensor and fuel pump module electrical connector .if you need help to replace the fuel level sending unit.you need a haynes repair manual.it has instruction how to remove and replace the fuel level sending unit.but most of the time the whole new fuel pump module come with new fuel level sending unit.if you are replacing fuel pump.when done put every thing back visa versa. be very careful working around gasoline and fuel tank.dont smoke.becareful dont make no sparks with wrenches when removing gas tank.wear safety glasses and have a helper at all times. dont work under vechicle by your self.

Apr 11, 2011 | 1999 Oldsmobile Alero

2 Answers

Were is the fuel filter and is the fuel pump in the gas tank


the fuel pump is in the gas tank and the fule filter runs along the bottom of the Driver side..if your looking at the gas tank follow the gas lines that go toward Eng. you will see the Fuel filter

Dec 30, 2010 | 1996 Dodge Caravan

1 Answer

I need to change my fuel filter in my 98 Dodge Intrepid. I know I need to drop the gas tank, but I'll be honest I've never did this before. I would like to have pictures to see what it looks like.


300M, Concorde, Intrepid, LHS, 1998-2004 - Fuel Filter Removal & Installation The fuel filter mounts to the frame rail in front of the fuel tank. The inlet and outlet ends of the filter are marked for installation purposes. Install the fuel filter making certain that it is properly orientated.

NOTE The fuel filter is part of the fuel pressure regulator mounted on the fuel pump module.
  1. Before servicing the vehicle, refer to the Precautions section.
  2. Properly relieve the fuel system pressure.
  3. Lower the fuel tank.
  4. Remove or disconnect the following:
    Negative battery cable Purge and vent lines Fuel line from the pressure regulator Filter/regulator by pushing in the locking tab, turning the regulator to unlock it and pulling the it straight up
To install:


7c8fc38.jpg

Fig. Cut away view of the fuel filter/pressure regulator
  1. Push the fuel filter/regulator into the fuel pump module and turn to lock it into position.
  2. Connect the fuel lines and install the tank.
  3. Start the engine, check for leaks and repair if necessary.


Fuel Pump - Removal & Installation
The in-tank fuel pump module contains the fuel pump and pressure regulator which adjusts fuel system pressure. Fuel pump voltage is supplied through the fuel pump relay.

The fuel pump is serviced as part of the fuel pump module. The fuel pump module is installed in the top of the fuel tank and contains the electric fuel pump, fuel pump reservoir, inlet strainer fuel gauge sending unit, fuel supply and return line connections and the pressure regulator. The inlet strainer, fuel pressure regulator and level sensor are the only serviceable items. If the fuel pump requires service, replace the fuel pump module.
  1. Before servicing the vehicle, refer to the Precautions section.
  2. Properly relieve the fuel system pressure.
  3. Remove or disconnect the following:
    Negative battery cable Fuel tank
  4. Clean the top of the tank to remove any loose dirt.
    Fuel lines from the fuel pump module by squeezing the quick-connect fitting with thumb and forefinger

    4edc7fc.jpg


    Fig. Using special tool 6856, remove the fuel pump module locknut
    Fuel pump module electrical connector from the top of the fuel pump module
  5. Using special tool 6856, remove the fuel pump locknut by turning it counterclockwise.
    CAUTION The fuel reservoir of the fuel pump module does not empty out when the tank is drained. The fuel in the reservoir may spill out when the module is removed.
  6. Remove the fuel pump and O-ring from the tank and discard the O-ring.
To install:
  1. Thoroughly clean all parts. Wipe the seal area of the tank clean. Place a new O-ring on the ledge between the tank threads and the pump module opening.
  2. Position the fuel pump module in the tank. Be sure the alignment tab on the underside of the pump module flange sits in the corresponding notch in the fuel tank.
  3. While holding the fuel pump module in place install the locking ring and torque to 40 inch lbs. (5 Nm) using special tool 6856 or a spanner-type tool.
  4. Install or connect the following:
    Fuel tank Fuel pump module electrical connector Negative battery cable
  5. Fill the fuel tank with fuel. Install the fuel filler cap. Turn the ignition switch to the ON position to pressurize the system. Check the fuel system for leaks.
Hope this helped.

May 11, 2010 | 1998 Dodge Intrepid

1 Answer

No/Low Fuel Pressure after replacing in-tank fuel pump & filter


Need to have the fuel pressure checked at fuel rail to know for sure if there is a fuel pressure problem for sure. There may be a in line filter as well, you can also do a check of the pressure regulator by pulling the vacuum line off of it then try starting the car with it off and see if it runs, if it does the regulator is bad, but IF it doesnt run doesnt necessarly mean it is good, a lot of fuel filters have a bypass wich allows the gas to bypass the filter when it is full bad thing is the debris can then plug the injectors causing problems, or there could be a loss of signal to tell the injectors to give fuel to the cylinders from an electrical or a sensor failure. So it is best to test the pressure to know for sure if it is in the fuel line or the injectors if it is truly being starved of gas. hope this helps

Apr 13, 2010 | Hyundai Motor 2003 Sonata

2 Answers

5.7L engine has fuel pick up issue running out of gas with indicator stating 1/4 tank left. replaced sending unit and fuel pump.. any suggestions


Most likely it's not a pick up issue since the fuel sending unit is right to the bottom of the tank. It's going to be and electrical or the float in the sending unit is bent and is giving a fault's reading of 1/4 of tank when the tank is actually empty. It's common for the float to the sending unit to get knocked out of alignment if the unit is knocked around to much when installed in the gas tank and or wire harness has not been replace from the sending unit to the frame of the car which is only around $15.00. Fill the gas tank a few time to the top may realign the float and give you a more accurate reading. Good luck and hope this helps.

Oct 27, 2009 | 1996 Buick Roadmaster

1 Answer

FUEL PRESURE / FUEL GAUGE


Buick with a 5.0?? OK, regardless, pressure should not drop like that. Possible that fuel filter is full of **** & should be changed, or, you may indeed have a bad pump... (can happen). Sending unit: sounds like you have the leads reversed or the unit is somehow different than the one you replaced.

Nov 11, 2008 | 1995 Buick Riviera

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