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.
1988 Chevy Dually changing from diesel to gas already put enging in and stuck at the wiring harness.
SOURCE: 1988 chevy 2500 5.7 no por to fuel pump fuse
Fuel pump fuse is cut out by a relay and I believe the oil pressure switch.
The goal is to have the fuel pump shut down automatically if there is an accident and the engine stops.
SOURCE: tom fuel pump on 1989 chevy 2500 truck sometimes
weak pump possible,wiring would ber all the time,relay could be relay its the cheapest part so id start there
SOURCE: fuel pump not coming on
Check this link, it may take a little searching but may help.
http://www.autozone.com/N,311494/shopping/vehicleSelect4.htm
SOURCE: where is the fuel pump on a 1988 chevy S10 truck
in the top of the gas tank
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