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ford v10 only building 10 psi fuel pressure, im stumped...

Discussion in 'Ford Trucks' started by GSS LLC, Aug 31, 2012.

  1. GSS LLC

    GSS LLC Senior Member
    Messages: 639

    replaced regulator, replaced fuel filter, replaced pump. now im out of ideas. relay is working, i swapped it with another before replacing pump. i can hear the pump cycle for 3 seconds on key on. only building 10 psi. ???????????
     
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,962

    Is the tk not starting ? What's the issue ?
     
  3. crazyboy

    crazyboy Senior Member
    from NJ
    Messages: 296

    Where are you checking the fuel pressure at?
     
  4. GSS LLC

    GSS LLC Senior Member
    Messages: 639

    Truck starts, runs like poo. Checking pressure at test port on fuel rail.
     
  5. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,962

    Ok. Did you ck to make sure you have a) 12v pwr and B) 12v gnd? The gnd is frame and it can get nasty corroded
     
  6. GSS LLC

    GSS LLC Senior Member
    Messages: 639

    Pump is running.
     
  7. crazyboy

    crazyboy Senior Member
    from NJ
    Messages: 296

    Did you check it at the fuel filter?
     
  8. GSS LLC

    GSS LLC Senior Member
    Messages: 639

    No. Fuel filter is new
     
  9. crazyboy

    crazyboy Senior Member
    from NJ
    Messages: 296

    Sure it's not backwards?
     
  10. GSS LLC

    GSS LLC Senior Member
    Messages: 639

    Positive. Only goes in brackets one way. And says in and out on correct sides
     
  11. crazyboy

    crazyboy Senior Member
    from NJ
    Messages: 296

    Well there goes that idea, seen it done before so figured I would check.
     
  12. maverjohn

    maverjohn Senior Member
    Messages: 902

    Did you check for a pinched line ?
     
  13. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,962

    Again. Ck for pwr and gnd at the pump. Just b/c its running don't mean its got full voltage
     
  14. GSS LLC

    GSS LLC Senior Member
    Messages: 639

    True I'll do that
     
  15. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Pinch the return line (if it has one) and see if the fuel pressure spikes
     
  16. brad96z28

    brad96z28 PlowSite.com Addict
    Messages: 1,526

    Ck ur gauge on another vehicle to make sure it is reading propperly?
     
  17. GSS LLC

    GSS LLC Senior Member
    Messages: 639

    well dip me in poo and roll me in cactus needles.

    bad ground. never before in my life seen this. usually either it works or not with grounds. intermittent maybe, but no "sorta works" ive ever come across.
     
  18. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,962

    Well glad it was cheap fix. Pwr and gnd get a alotta pple. Glad I mentioned it a few days ago
     
  19. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    Fuel pumps need to have the correct voltage and amp flow to work. My EFI manual makes a point of telling you in a few places. I chased a pressure problem for a year! Ended up a bad tank switcher. I went through the same head scratching trip!