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Category: Ford
Satisfied Customers: 26455
Experience:  ASE CERTIFIED TECHNICIAN ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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1986 ford f350 with 460 elec fuel pumps and holley carb. has

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1986 ford f350 with 460 elec fuel pumps and holley carb. has juice to fuel pumps in crank postion but no juice to fuel pumps in run postion.

You are going to want to check power going into the fuel pump cut off relay on two of the four wires with the key on and cranking. The two wires that should have power are the yellow wire and the red/yellow wire. Here is a wiring diagram.

Customer: replied 7 years ago.
has power on yellow but does not have power on red yellow wire
Well, then go back to the oil pressure switch and see if it has power going in the oil pressure switch. If not, then check fuse 18 in the fuse panel.
Customer: replied 7 years ago.
no juice on either wire on oil pres switch
And what about the fuse?
Customer: replied 7 years ago.
all fuses are good
DO we have power to that fuse with the key on?
Customer: replied 7 years ago.
Well, if this is the case, then you simply have a break or an open between the that fuse and the oil pressure switch.
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