i have an 88 f150 5.0 new high and low pressure fuel pump it doesnt like to start it cranks and cranks then finally starts it runs great after it starts i think im loseing fuel pressure when the motor

Asked by Aug 25, 2013 at 12:41 AM about the Ford F-150

Question type: Maintenance & Repair

it cranks a lot before starts I think im loseing fuel pressure when motor is off I just don't know where please help

1 Answer

23,765

Fuel pressure regulator? Fuel Filter? Leaking injector? You all ready hit the 2 most common. It's possible that you have a fuel injector that's leaking down or not sealing well and not know it. The 5.0L EEC-IV injection system on that truck is non-sequential. In other words, instead of firing the individual injectors as needed, it fires 2 on each bank simultaneously (4 then 4). So if one injector messes up, it will be difficult to tell. Ypu would need some way of isolating and pressurizing the fuel rail to watch a pressure drop. A trick you can try: After a cold soak, cycle the key on for 3 seconds then off. do it a couple of times and then try to start it. The fuel pump(s) will run for 3 seconds without a signal that the engine is running. This trick works great to prime one that has run out of gas too!

Your Answer

Add photo

Related Questions

  • if your truck cranks but will not start, what would be the problem? 191 answers

    STARTING PROBLEM I have a 2000 ford f150 5.4L the truck cranks but will not start some times. if i spray starter fliud into the booster in will start up. but other times the truck will start then just...

    2000 Ford F-150 Lariat Extended Cab SB

    -

    Maintenance & Repair

  • Hard starting 85 F150 5.0 EFI 4 answers

    Seems I am having same problem as a lot of F150 folks. Key on pumps up 2.seconds. turns over but no start. Been running perfect and has been firing right off within a couple of seconds. But cold...

    1985 Ford F-150 STD Standard Cab SB

    -

    Maintenance & Repair

  • 2010 F150 Cranks wont start no fuel 7 answers

    We had a problem a month ago where it would crank and not start. After some trouble shooting we found a bad connection on the fuel pump fuse and installed a new fuse and things worked fine. A couple d...

    2010 Ford F-150 FX4 SuperCrew 4WD

    -

    Maintenance & Repair

  • 1989 F150 Fuel problems. 11 answers

    I have a 1989 Ford F150 with the 5.0 fuel injected. Its not getting gas and I don't know where the problem begins. I know its getting fuel up to the fuel pump by the driver's door. but not sure about ...

    1989 Ford F-150

    -

    Maintenance & Repair

  • Fuel System Loses Pressure 21 answers

    I have a 2003 Chevy S-10 Pick Up with the 4 cylinder & auto trans. Whenever I start it I must "cycle" the key 2 or 3 times to prime the fuel system. If I don't it cranks a very long time before start...

    2003 Chevrolet S-10 2 Dr LS Standard Cab SB

    -

    Maintenance & Repair

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 7,660
#2 dandyoun
dandyoun
Reputation 4,300
#3 tennisshoes
tennisshoes
Reputation 2,680
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,769 Great Deals out of 166,158 listings starting at $1,950
Used GMC Sierra 1500
830 Great Deals out of 65,980 listings starting at $1,995
Used Dodge Ram 1500
438 Great Deals out of 11,284 listings starting at $1,000
Used Ford F-250 Super Duty
366 Great Deals out of 47,341 listings starting at $1,795
Used Toyota Tundra
490 Great Deals out of 33,146 listings starting at $3,400
Used Toyota Tacoma
484 Great Deals out of 38,935 listings starting at $2,900
Used Ram 1500
911 Great Deals out of 112,847 listings starting at $6,396
Used Ford Mustang
378 Great Deals out of 46,805 listings starting at $1,500
Used Ford F-250
468 listings starting at $3,975
Used Nissan Titan
179 Great Deals out of 18,284 listings starting at $3,995
Used Chevrolet Colorado
232 Great Deals out of 23,393 listings starting at $2,200
Used Chevrolet Tahoe
573 Great Deals out of 27,339 listings starting at $999
Used Ford Explorer
801 Great Deals out of 74,513 listings starting at $750
Used Ford Ranger
190 Great Deals out of 6,023 listings starting at $1,299
Used Jeep Wrangler
271 Great Deals out of 18,549 listings starting at $2,995