Question about 2004 Ford F150

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2004 f150 4.6 intermittent loss of fuel pump pressure

Truck first had an intermittent stalling issue and finally died completely.Diagnosed and replaced faulty fuel pump. Constant 40psi after changing the pump. Truck now has intermittent bouts of stalling (complete loss of pressure) or bucking as the pressure fluctuates. When the pressure fluctuates the pump sounds like it is starting and stopping.

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  • mullins5 Jan 29, 2009

    Where is the fuel pump relay located?

  • mullins5 Jan 29, 2009

    MrScary66613. Where is the fuel pump relay?

  • John Jan 22, 2013

    check the fuel pump modulator it is mountrd on the underbody above the spare tire. Those units corode and break apart . They cost around 100.00 way cheaper than a fuel pump and you can replace it yourself in about 15 Minutes

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The relay is located in fuse box under the hood on driver side close to air filter housing. you can swich that with horn relay just to test it . also check to make sure the conector on the tank unit is o.k . i had the ground connection loose on my truck causing it to stall.
good luck

Posted on Jan 29, 2009

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If no one here can locate the relay for you, you might call your local library and find out where the nearest library is that has the Factory Service Manuals (not Chilton, or Motors, or Hanes.).Once you find them, you'll find they are an excellent source of information for repair of your vehicles.

Posted on Jan 29, 2009

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You might try putting in a heavier duty pump. my moms car did that and she went with a truck pump which was heavy duty and it solved the issue.

Posted on Jan 29, 2009

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Hi!

I think its the issue with Pressure control solenoid

Posted on Jan 29, 2009

  • Rylee Smith
    Rylee Smith Jan 29, 2009

    Change the pcv valve, a simple and cheap fix (Will cost you around $5-10). There is an insulated hose that goes to it. Check this hose and there would be a 2 or 3 in piece of rubber hose that attaches the pcv to the pcv hose.

    This rubber part would have blown a hole in it and causing a leak. Check that insulated hose covering back and take a good look at the rubber hose connection. It will cost you around $5 and 10 minutes with no special tools.



    If you can stop by an auto store that reads codes and get an idea what codes you are throwing it would be beneficial in the long run so the mechanic doesn't take you for a ride.

  • Rylee Smith
    Rylee Smith Jan 30, 2009

    Hi!



    You are facing intermittent loss of fuel pump pressure which is due to a leak in the hose. Also, check if the hose connections are loose.



    Please revert for any clarifications.

    Thanks

    Rylee

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Welcome to Fixya! Have you Replaced the Relay for the Fuel Pump? It could Cause this. Also, Replace the Fuel Filter. Let me know what you Get! Please Rate my Solution, I need all the Help that I can Get! Thanks!

Posted on Jan 29, 2009

  • Travis Humphries
    Travis Humphries Jan 29, 2009

    Look in The Fuse Relay Box under the Hood. Not sure what Side on Ford But, It is in there. The diagram of Relays is inside the Cap on the Box. Or Inside the Owners Manual. Let me Know if you cannot Locate it.

  • Travis Humphries
    Travis Humphries Jan 29, 2009

    Did you get the Response Post?

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