When I switch to the rear tank on my '89 ford f250 it pumps all the gas to the front tank that is all ready full. Why is it doing this?

Asked by Jan 08, 2014 at 04:37 PM about the 1989 Ford F-250 STD Standard Cab 4WD LB HD

Question type: Maintenance & Repair

This has started after we put new fuel pumps in both tanks.

3 Answers


You will have to change both fuel pumps and filter and ford makes a check valve that goes on both fuel pumps that will need to be installed. This is as per ford tsb's.

2 of 2 people found this helpful.

Were the fuel pumps motorcaft/ford?


It's not the fuel pump that's the problem. It is the metal lines the fuel pumps attach to. They have a built in check valve and they are blown out letting the pump push fuel into the other tank. That is why it has to be ford complete unit fuel pumps.

Your Answer


Looking for a Used F-250 in your area?

CarGurus has 425 nationwide F-250 listings starting at $4,543.


Ford F-250 Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Ford F-150
2,603 Great Deals out of 222,391 listings starting at $1,222
Used Ford F-350
240 listings starting at $5,900
Used GMC Sierra 1500
903 Great Deals out of 59,465 listings starting at $1,980
Used GMC Sierra 2500
152 listings starting at $4,900
Used Ford Mustang
317 Great Deals out of 38,894 listings starting at $1,995

Used Cars For Sale

1999 Ford F-250 For Sale
22 listings starting at $4,990
1997 Ford F-250 For Sale
126 listings starting at $4,543
1996 Ford F-250 For Sale
68 listings starting at $5,431

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.