1992 Ford F-250 Rear Tank No Start

FORD F-250
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CATTLECLERK
  • MEMBER
  • 10 POSTS
1992 F250 460 EFI 135000 miles.
I started my truck and drove to town and shut my truck off. when I returned to my truck and tried to start it, it would only turn over but not start on the rear tank, however when I switched to the front tank the truck started right up. when I tried to switch back to the rear tank it died INSTANTLY.
it runs great on the front tank and will not run at all on the rear tank. Help???
Nov 16, 2006 at 12:49 AM
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CATCH_15
  • ✓Experienced Mechanic
  • 250 POSTS
Check to see if the fuel pump is running in the rear tank. If that doesn't work, check the fuel pump relay. Also, the switch may be bad.
Nov 16, 2006 at 6:35 AM
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CATTLECLERK
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  • 10 POSTS
Where would I find the relay?
Is there by any chance a manual valve for tank switching?
Nov 17, 2006 at 12:12 AM
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BAREFOOTBOB88
  • MEMBER
  • 60 POSTS
Usually the fuel pump relay is found on the driver side fender when under the hood. Both front and rear pump relays clip into a plastic cover that bolts onto a bracket on the well. If it's not on the drivers side look on the passenger wheel well. Now for switching the tank there's an electric valve that is controlled by your tank switch. Usually you can hear the switch work with the truck not running.
Nov 18, 2006 at 12:09 PM
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CATTLECLERK
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  • 10 POSTS
Thankyou very much for the help!!!
It was indeed the switch, however the switch was not bad, just a bad connection at the switch plug-in.
Thankyou again!!
Nov 20, 2006 at 12:32 PM
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Suggested Repair

Check whether the rear-tank fuel pump runs, then inspect the fuel pump relay on the inner fender and the tank selector switch and its plug connection. In this case, cleaning or repairing the bad connection at the switch plug restored rear-tank operation.

Conversation Summary

A 1992 Ford F-250 with a 460 EFI would crank but not start on the rear fuel tank and died immediately when switched from the working front tank. Advice was to check the rear fuel pump, fuel pump relay, and electric tank-selector switch. The owner found the switch itself was good but had a bad connection at its plug, which resolved the problem.

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