1994 f800 bucket truck fuel solonoid

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motorhead460

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Hey guys I have a 94 f800 hi-ranger with air brakes that has a 8.3 cummins diesel in it I think. The fuel shut off solenoid will let it start for just a second then it will shut off by itself. Anybody ever had this happen? I would like to find a schematic on the electrical if someone has one, I think a sensor or pressure switch might be the problem but I have no clue where to start looking. Thanks much
 
Turn key on, pull the solenoid by hand. Have had this happen to 2 8.3Ls. The solenoid is around 100-150 depending on which model.
 
I took off solenoid and it is fine,pulls in on the big center white wire and stays in on the red wire when I throw 12v at it. Must be a wire or relay.anybody know where the relays might be hiding,I cant find em.Thanks
 
Relays should be on the fire wall in the engine compartment, likely buried in a wire loom.

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