can a vacum line cause a fuel pressure drop from 76 lbs to 7 lbs on a 89 ford f150 laraint 4x4 ,302 fuel injected with dual tank

Asked by Aug 29, 2016 at 06:51 PM about the 1989 Ford F-150 XLT Standard Cab SB

Question type: Maintenance & Repair

bypassed my fuel line. My line starts from my tank to the the fuel pump on the
rail. Still wont run. Replaced all new parts except fuel line.

1 Answer

100,275

No, the only vacuum line even closely related to the fuel system is the one on the fuel pressure regulator, and if it was bad or missing it would cause the fuel pressure to top out as high as the fuel pump could go. Now if the fuel pressure regulator stuck in full bypass it could cause a large pressure drop but you could recover that pressure by pinching off the return fuel line. Your right in that grey area of fuel pumps, does yours have lift pumps in the tanks and 1 large pressure pump in the frame rail, or high pressure pumps in the fuel tanks? Cause 7 lbs of fuel pressure sounds like lift pump pressure, not main pump pressure.

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    8,910
  • #2
    dandyoun
    Reputation
    4,540
  • #3
    tennisshoes
    Reputation
    3,060
View All

Related Models For Sale

Used GMC Sierra 1500
873 Great Deals out of 65,536 listings starting at $1,500
Used Ford Mustang
709 Great Deals out of 38,398 listings starting at $895
Used Ford F-250
454 listings starting at $1,800

Used Cars For Sale

2018 Ford F-150 For Sale
27,619 listings starting at $20,990
2017 Ford F-150 For Sale
117 Great Deals out of 82,876 listings starting at $17,990
2016 Ford F-150 For Sale
120 Great Deals out of 7,637 listings starting at $18,989
2015 Ford F-150 For Sale
280 Great Deals out of 10,496 listings starting at $14,999
2014 Ford F-150 For Sale
429 Great Deals out of 13,638 listings starting at $10,849

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.