While operating 89F150 4.9. dual tanks, pressure builds in front tank and overflows. What is the cause?

Asked by Leland_41 Dec 24, 2015 at 03:41 PM about the 1989 Ford F-150 S Standard Cab LB

Question type: Maintenance & Repair

Driving on front tank, pressure builds in front tank and overflows. If you try to remove filler cap it gushes out fuel.

1 Answer

14,505

The fuel pump check valve is bad and allowing the other tank to fill it up. Ford had an inline valve that installed at the outlet of the fuel pump to prevent this. The other option is to replace the pumps as assemblies.

Your Answer:

CarGurus Experts

  • #1
    OJ
    Reputation
    42,600
  • #2
    Gene Arnett
    Reputation
    16,040
  • #3
    Rowefast
    Reputation
    15,900
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
130 Great Deals out of 6,516 listings starting at $3,975
Used Ford F-250
4 listings
Used Ford Mustang
57 Great Deals out of 1,352 listings starting at $4,995
Used Ford Ranger
26 Great Deals out of 1,587 listings starting at $5,400
Used Ford Bronco
21 Great Deals out of 1,260 listings starting at $37,000

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. Content will be removed if CarGurus becomes aware that it violates our policies.