Question about 1996 Ford Taurus

2 Answers

Losing fuel pressure as soon as car is shut off

Not sure if it is pump or regulator

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  • Brian Decker Sr. Feb 03, 2009

    it has 30 psi runnin as soon as we shut it off it drops to 0 right away with vac line off it has 40 psi.

    it cranks along time an as soon as it pressurizes it fires up

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2 Answers

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  • Master
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Two Options -

Replace the cheapest of the two first and see if that fixes it, or

get a pressure gauge and a short piece of rubber tubing. Disconnect the fuel line at some point, connect to pressure gauge with the rubber hose and hose clamps, then test fuel pump output pressure.

Reply back what you find.

Posted on Feb 03, 2009

  • Mark Egan Feb 03, 2009

    There is a check valve, either in the fuel pump, or in the line from the fuel pump. Be sure to check it to. It could still be the regulator, because if it has a hole in it, it will bleed back to the gas tank.If you do the fuel pump test as I explained, it tests the check valve. Pressure should not drop when key is turned off in that test.

    If it does, check valve. If it doesn't, suspect regulator.

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  • Ford Master
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There is a check valve that holds fuel pressure, this valve is part of the fuel pump which located in the fuel tank, the fuel pressure regulator WILL NOT FIX THE PROBLEM. I am a Ford Factory trainned tech with 20 years work on all Ford cars and trucks from the 80's up.

Posted on Feb 03, 2009

  • yadayada
    yadayada Feb 03, 2009

    One note: the fuel filter must be changed with the pump.

  • yadayada
    yadayada Feb 04, 2009

    U are describing a bad fuel pump check valve and a normally functioning pressure regulator.



    All modern fuel injected cars and light trucks use the same fuel pump design, it is called a Walboro style pump, they all have a built in check valve, it is not in the fuel line or the pressure regulator.

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0900c152800a96ce.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 5: Remove the fuel filter/pressure regulator retaining clip from the top of the assembly


0900c152800a96cf.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 6: Replace the old fuel filter/pressure regulator mounting gasket

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To install:


0900c152800a96d0.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 7: Check the condition of the fuel filter/pressure regulator O-rings

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