aux tank wont work on an 89 f150

Asked by wildfire4x4 Oct 26, 2019 at 07:16 PM about the 1989 Ford F-150

Question type: Maintenance & Repair

The front tank works fine. When i try to flip the switch over to the aux tank it
continues running off the main tank. would this be a fuse or a relay problem?

1 Answer


My two old trucks drove me nuts with this same problem and I finally gave up, took them to my Ford dealer and let them sort it out. Both work fine now.

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