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

Asked by 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

6,815

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

Ford F-150 Experts

  • #1
    OJ
    Reputation
    9,430
  • #2
    dandyoun
    Reputation
    4,640
  • #3
    tennisshoes
    Reputation
    3,270
View All

Related Models For Sale

Used GMC Sierra 1500
1,208 Great Deals out of 64,382 listings starting at $999
Used Ford Mustang
586 Great Deals out of 38,990 listings starting at $1,895
Used Ford F-250
440 listings starting at $4,995

Used Cars For Sale

2018 Ford F-150 For Sale
3 Great Deals out of 116,913 listings starting at $20,645
2017 Ford F-150 For Sale
157 Great Deals out of 28,323 listings starting at $18,500
2016 Ford F-150 For Sale
196 Great Deals out of 7,712 listings starting at $16,991
2015 Ford F-150 For Sale
506 Great Deals out of 11,327 listings starting at $11,990
2014 Ford F-150 For Sale
764 Great Deals out of 15,213 listings starting at $8,075

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.