97 gmc 1500 2-wdr 5.7L engine will not start

SOURCE: fuel problem in 97 chevy truck 1500

your fuel pressure regulator could be bad also check fuel pressure with a guage it should be about 55 to 65 pounds

SOURCE: 2000 chevy silverado 1500 4.3 eng

More than likely its a bad termianal connection on top of the fuel pump. Its a comon with chevys'

SOURCE: 03 silverado turn the key to start but starter will not engage

Interesting problem, on the starter is a "trigger" wire that originates from the ignition (may run to the power distribution center). When the truck is started 12 volts runs down that wire and activates the solinoid on the starter. Put a 12 volt test light on the trigger wire by the starter, have someone hit the key to start, test light should come on, if not chase wire back and look for a break in the wire or replace trigger wire.

SOURCE: 98 blazer stalls

It could be your fuel pressure regulator, check this link for details:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528022b9c4

That's what it looks like.

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.