1986 Ford F250 Second fuel tank not working

1986 FORD F-250
177,600 MILES • V8 • 2WD • AUTOMATIC
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WAYWRD
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We have a 1986 ford f250 3/4 ton pick-up. we purchased it about 3 years ago. Originally the second fuel tank worked fine. About a year ago it stop working. When you flip the relay switch the fuel gauge goes to empty (even though tank is full). we're not even sure where to start looking for the problem. My dh says possibly the floater?? Any help will be appreciated.

Thanks
Mar 30, 2008 at 10:55 AM
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BLACKOP555
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does it pump fuel out of the second type, just it doesnt say if it has fuel in it?
Mar 30, 2008 at 11:03 AM
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WAYWRD
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I should have been more specific, sorry. The fuel gauge for the second tank goes to empty and will stop running, as though it were out of gas.
Mar 30, 2008 at 12:39 PM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
check the fuel tank relay and the fuses. with the switch flipped check for voltage at the pump.
Mar 30, 2008 at 12:48 PM
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