Fuel Swapping between both tanks
Thread Starter
Member
Joined: Nov 2010
Posts: 35
Likes: 3
Fuel Swapping between both tanks
i can fill up my front tank and gas will eventually move to the back tank after driving a while, and i suspect its does the same when running off the back it will all work its way up front (my front tank wont read on the fuel gauge but the rear works). not sure where to go with this one found similar issues but none quite like mine. please help
92 f150.
92 f150.
Member
Joined: Apr 2012
Posts: 46
Likes: 0
From: Rogers/Bentonville, AR
Go to the advanced search feature, and search on "cross fill tanks" in the '89 - '96 forum:
https://www.f150forum.com/search.php?searchid=7166539
You'll notice that it's a very common issue, and in fact Ford issued a technical service bulletin (TSB) to install a check valve to prevent it from happening; however, unlike a recall (which never expires) the TSB expired some years ago. Also, the retrofit kit specified in the TSB isn't readily available these days, although a few guys have found them on eBay.
My guess is that one of your sending units needs to be replaced; hopefully one of the threads in the above URL can shed some light on which one is the faulty one.
https://www.f150forum.com/search.php?searchid=7166539
You'll notice that it's a very common issue, and in fact Ford issued a technical service bulletin (TSB) to install a check valve to prevent it from happening; however, unlike a recall (which never expires) the TSB expired some years ago. Also, the retrofit kit specified in the TSB isn't readily available these days, although a few guys have found them on eBay.
My guess is that one of your sending units needs to be replaced; hopefully one of the threads in the above URL can shed some light on which one is the faulty one.
It's a Canadian thing eh!
Joined: Nov 2010
Posts: 6,539
Likes: 196
From: Ontario, living across a hay field
The fuel pump check valves go bad which is why they cross fill. If both tanks do that your options are either replace at least 1 or both pumps, install the Ford in-line check valve kit or live with just keep an eye on the fuel level and keep one tank from overfilling and keep one tank a little less full then the other.