My truck wont start .the starters fine and fuel pumps fine

SOURCE: 2000 chevy silverado 1500 4.3 eng

Chevy Trucks, Blazers, S10 pickup and the like will vapor lock ecspecially the 2000 models. Do not tighten the gas cap past 1 click. There is a tube that runs from the top of the tank down and this gets hot and collapses or burns in half. We just bought a reinforced rubber tube cut it to lengh and use it instead of part and it's worked grat for 2 years so far.

SOURCE: Truck has trouble starting- runs fine after start

I found the fuel pressure regulator on the fuel rail was leaking fuel into the intake manifold via the vacuum hose.Was hard to start and rough idle. Pull vacuum line and see if fuel is coming out-if so like me-replace it. About 50.00 at Murrays. Also the two inner cylinders on the passenger side-opposite of the vacuum line will be very rich fouled-replace them all

SOURCE: my truck will not start.

I have had similar problems and had to replace the fuel pressure regulator. It's a major expense because it sets below the diaphram in the intake manifold. Ask your mechanic about it, it may be the issue. I would get about 30,000 miles between replacement, I've replace it 3 times since purchasing the 2000 chevy blazer new, first one was under warranty.

SOURCE: 1987 chevrolet truck with tbi fuel injection

check your ecmb fuse in your fuse box,if fuse is good your computer might be bad

SOURCE: dont know whether its the fuel pump or something else

How did you determine its not the fuel pump?It could be the fuel filter but I dont think so.Your truck requires a certain amount of fuel pressure to start and a different amount to run properly.You would have to check what your fuel pressure is to say its not the pump.It should be something like 65 psi to start and 55psi to run.Even though you can hear the pump come on when turn the key it might not be putting out enough pressure to start the truck.I realize im a little late with this post but it might helpfull to others.