1998 GMC Sierra fuel delivery problem

Are you not getting any fuel whatsoever to the TB? The fuel line could be plugged with gunk and build up, or maybe you are getting some fuel, just not the correct amount of pressure. Could need a fuel filter, or sometimes (but pretty rare) the fuel pump does go out but keeps running, it just doesn't send near enough pressure to the engine. Also, if by chance you are getting fuel to the injectors, those plug up, get dirty and go bad. (Couldn't count how many I've replace) ;) Hope that helps.

If you are sure that no fuel is getting to the TB, you should probably start by pulling your fuel filter off (runs along frame rail, driver side) and looking to see how dirty the fuel is that comes out. You should also try blowing our your fuel line to make sure nothing is clogging it and stopping flow.

After some further investigation I am getting fuel to the fuel meter body with good pressure (approx. 60-63 psi). This tests I've run do not indicate a fuel pressure regulator problem but I think it may be the only thing left. Fuel pump is fine and a new fuel filter has been installed. You may be right with the dirty injectors. Funny how it happened in the first place, I filled the tank, drove it maybe 10 miles (ran fine) shut it off and then it wouldn't start. Thanks again for your feedback.

If you're looking for a quick fix, I've seen varied success with fuel injector cleaner additive. I'm gonna get flamed for even mentioning the stuff, I know. But seriously, don't buy the $2-3 stuff from the gas station, but the $15-20 stuff from a parts store. A buddy of mine has a 2000 S-10 Blazer that lives on the stuff. He's too cheap to replace the injectors so every 1-2 months his car won't start anymore. He's always got an extra bottle in the back, drops it in the tank, turns the key and it fires right up. Every single time, and he's been doing it for about 100,000 miles now.