2000 Jimmy 4.3 vortec no start please help
So to start the truck just cranks with no attempt to start, I have checked spark in 3 cylinders and there is spark (the plugs are sparking but they are old), I replaced the fuel filter just because (12$) and that changed nothing, the fuel pump is fairly loud when turning the ignition to the on position I am thinking it may be weak? I am going to test the fuel pressure at the point next to the distributor pack today I just have to go borrow the kit from autozone. does anyone know what pressure it should be at that spot? do I just crank and watch or is there a different procedure? anybody have any ideas? I tried sparaying fuel directly into the tb and it still didn't even try to start.