It won't die when pulling the relay because it has another power path to the fuel pump through the oil pressure switch . Fuel Pump Electrical Circuits Description and Operation watch this video on fuel pump control , shows chrysler first , ford ,then gm . wait for gm an he explains the oil pressure switch . Plus when it won't start ,don't guess or theorize ! Test what's missing ? check for spark , no spark check ignition system , coil's , ignition module , crank sensor etc... has spark ,do a fuel pressure test etc... don't think computer , when it won't start does the check engine light come on with the key on run not start . If light is lit ,nothing wrong with the cumputer . If want to fix cars you really should take some automotive classes . Test don't guess .Watch some other videos crank no start videos etc...
SOURCE: Fuel pump problem
Check the ground. Sometimes it will work its way loose, not allowing it to start. If ok, check your fuel pump relay in the fuse panel under the hood on drivers side fender well.
SOURCE: Fuel pump problem
Check the Ground wire which runs from the fuel pump to the back of the truck. Had this very prob myself.
SOURCE: 1988 gmc s15 2.5l 5spd/starts strong then dies
Have you tried replacing or testing the fuel pump and/or filter?
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i'm having the same problem with mine i had it plugged to a computer and it's a bad misfire it runs fine at times and sometimes it sputters
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