Question about Ford F-150

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Fuel puressre is weak

I have a 00 Lightning and i replace my fuel pumps because furl pressure was at 26psi when running. After replacement of fuel pumps my fuel pressure is still at 26 psi at fuel rail and right off the pump. My truck rpms shoot up to 5k rpms at time the goes back to 900 on its on.

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  • ALFRED AUSTELL
    ALFRED AUSTELL Apr 13, 2014

    I did prime the fuel pumps before starting. I was leaning towards a faulty engine computer because when I'm driving it will miss fire and then smooth out. I will try a new fuel pressure regulator. What would cause the engine to rev to 5k rpms when not on the accelerator??

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  • Expert
  • 79 Answers

Sounds like fords MAF or mass airflow sensor causing engine surge. do you have any codes from the check engine light. 24-36 lbs of fuel should be fine!

Posted on Apr 13, 2014

Testimonial: "yes i have a lean code bank 1and a evap code. I've had the maf sensor check and it checked out ok. thank you"

  • ALFRED AUSTELL
    ALFRED AUSTELL Apr 14, 2014

    the maf sensor is checking out ok. i have a codes for lean bank 1.

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6 Suggested Answers

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Posted on Jan 02, 2017

emissionwiz
  • 75051 Answers

SOURCE: FUEL PUMP PRESSURE

Fuel pressure should be around 40-44 PSI at idle, if u replace the pump the correct pump has preset pressure, if the pressure is to high then the regulator may be stuck, it is near the injectors on the fuel supplu rail.

Posted on Dec 30, 2008

jigsaw_9077
  • 308 Answers

SOURCE: I have replaced the fuel pump on this 92 Ford

The mechanic should check on the idle .Because the Idle of the truck is adjusting by it self . That causes the truck to stop .check the Idle then lock it up to so that it will not adjust until it will make the truck stop .the main reason why the truck stop and pressure guage going down steadily is that no fuel enters the fuel pump when it adjust Idle by it self . It adjust by closing way or blocking the fuel to pass and go to the engine.then the engine dies .

Posted on Aug 22, 2009

Testimonial: "Thank you, jigsaw 9077"

emissionwiz
  • 75051 Answers

SOURCE: low fuel pressure 95 volvo 940 turbo

fuel pump check valve doesn't cause pressure loss, just hard starting cold, the check valve is part of the fuel pump, so to replace the valve u must replace the pump. do not use anything but the orig style pump, here is the part number from THE OE PUMP MAKER AT www.rockauto.com
DELPHI Part # FE0071 PRICE $124.99

Posted on May 05, 2009

tommyboinow
  • 324 Answers

SOURCE: don't know how to set timing after replacing fuel pump

replacing the fuel injector pump shoould not have any thing to do with the timing, did you prime the pump before putting it in?

it is critical that you prime the pump...

If you did not, take it back off and prime it then put it back on, it is possible there is air stuck in it...

Posted on Nov 26, 2008

  • 49 Answers

SOURCE: new pump, no fuel pressure at fuel rail??

fuel pump relay

Posted on Oct 04, 2009

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