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Hi, there is an oil pressure sensor mounted below the distributor, and the wiring for the fuel pump runs through this sensor. it needs to be plugged in. The sensor is usuall mounted in a brass pipe, that is screwed into the block, just behind the intake. Good luck...Coop
Good evening Michael. The fuse you are looking for is behind the plastic cover on the firewall on the right side. It may be a little disguised in a fuse holder. It is very near the battery junction box pins and fuse links. It's a 10 amp fuse and it supplies power to the relay for the fuel pump. Hope this cures your problem. Thank you for using FixYa!
I personally have 1988 GMC truck and had to replace the fuel pump. I found all the info including wiring diagram in a haynes repair manual. These can be purchased in most automotive parts stores. Something I found interesting is that the fuel pump's operation works through the oil pressure switch, located by the distributor screwed into the engine block. If this switch is stuck or sticking it will affect the fuel pump. Replaced a good fuel pump for nothing! The truck had sit up for awhile and the ground wire connections had to be cleaned as well.
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