1990 Ford F150 dual fuel tanks

Asked by Nov 21, 2016 at 02:50 PM about the 1990 Ford F-150 XLT Lariat LB

Question type: Maintenance & Repair

I just bought a 1990 f150 xlt lariat. Currently the truck is pulling from the
rear gas tank. When I switch to the forward tank, the needle on the gas
gauge gets pinned way past full and the truck dies, as if it just ran out of
gas. When I switch back to rear tank, truck runs fine.  Does anyone have
any ideas what could be wrong with forward tank. It appears as if the
selector switch is functioning fine.

3 Answers

It seems that it has a Fuel pump issue. In all actuallity, it seems as though the pump may of been taken out or completely unhooked from functioning. If the pump for tank 1 is disconnected from power, the needle will jump all the way up!!

5,845

Check the wiring plug to make sure tank front tank is connected, if it is, you'll have to remove it and inspect the fuel pump assy

Thanks for your quick response Thomas and lrodri911. I'll check the fuel pump connection. Is it mounted along the frame rail?

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