My first answer , does this have fuel body with injectors? If so I would try injector cleaner, to check this take air cleaner off, you will need someone to look at the fuel spay in fuel body while you turn over the engine, the spray should be constant, if not injectors are dirty or fuel line filter needs changing, located driver side inside frame.
Probably fuel pressure issue. Check for leaks, dirty filter, low fuel pressure could indicate bad fuel pump. Normally, a float would cause flooding, but a clogged jet could cause a lean / no start issue. Try some gumout fuel cleaner and a gumout spray clean of the carb and linkages before you get to far into a part issue.
SOURCE: 1998 GMC JIMMY won't start, fuel pump not humming, below zero
The Fuel Pump is Inside the Tank and you have a Relay in the Fuse Distribution Block under the Hood for the Fuel Pump. Try these first and let me Know what you get!
SOURCE: 1993 jimmy 4.3 liter wont
Check the ignition module (located in distributor, under cap). These modules not only control ignition firing but also send a signal to pcm to control fuel injectors. They can become heat sensitive and fail intermittently. Most auto parts stores can check these modules if you remove and take them in.
SOURCE: 1976 gmc 350 - no fuel getting to carb, I
yes it is probably the pump or a problem in one of the fuel lines but i would bet more on the fuel pump or suction line into the tank. If you can take the line off going to the tank put it in a jug of gas and see if the pump will pump it to the carb or the engine will run.
SOURCE: 93 gmc sierra 5.7 liter engine, injection carb,
you say you replaced the fuse, but does the fuse have power? the gray wire at pump should have power when cranking, or for 2 seconds when turning key on. At fuel pump relay, put power onto gray wire, the pump should run if the wiring is good. if it doenst run then ck for power at fuse while power is on gray wire.
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