I have a 1987 f-250 custom 460 motor with dual tanks and i don't have any power going to my fuel pumps or my selector switch I've replaced my relays and checked all my fuses and still don't have any power does someone know what else it could be?

 

Does the engine have a carb or is it FI?

 

it has a carburator

 

No power even while cranking the starter?

 

You will just have to get a test light and trace out the witing and see where you lose it at.
Here is a diagram to go by:


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well when I crank the starter I get power to the switch but when I turn the key on without cranking I don't get any power I cant hear the fuel pump priming or any thing I have power to the relays but none going back out so I thought it would have been the relays so I replaced them and still nothing

 

thank you for the wire diagram subford

 

Do you get fuel to the carburetor while the starter is engaged?

 

You have the wiring diagram.
Look and you will see there is no power until there is oil pressure.

The hot fuel handling system is not computer controlled.

You get power from the solenoid while cranking and power through the relay when the OPS and the inertia switch are closed.

 

so i wont get any power at all to the selector switch or fuel pumps until i crank the motor over even when i just turn the key on and don't crank the motor

 

Yes, that's correct.

 

You can also see there's a resistor in the 'run' side of the circuit, so don't expect to see full system voltage in run with a load applied.

 

If you need power temporarily, to test with the ignition on and the engine off, jumper the plug connected to the oil pressure switch located behind the EGR valve.

 

thanx ardwrkntrk

 

For testing with the key jumper photo:


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