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dual fuel tanks

tech247

2
0
1992 f 250. won't run on rear tank. has new fuel pump. can hear rear pump run but no fuel pressure on fuel gauge. runs fine on front tank. 50 psi.
any ideas.
 

tech247

2
0
fuel pump

no. transfer old unit. tested level senor before installing pump. gauge sweeps ok. did install new pig tale harness connector for new pump.
 
surewhynot

surewhynot

Rep whores make me sick
13,843
821
Florida
I have heard of the selector valve going bad and letting one pump pump fuel into the other tank instead of the engine.
 
mrfixit

mrfixit

Chief Chaotic Engineer
8,334
171
Malfunction Junction, Fidelity MO -or- Mound City,
The selector valve can and does go bad, and that is relatively inexepensive plus easy to change. Also make sure your fuel cap is venting properly. a clogged vent will create a vacuum in the tank, not allowing fuel to leave.
I am not real clear, but I do think there's a possibility that you also have the servo in-tank pumps in addition to the framerail mount one in your truck. I don't have my manuals nearby at the moment. If you do, the rear one may be bad.
 

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