94 s10 blazer 4.3 vortec "W" vin. We are at our wits end with this truck! It will crank over but will not start unless you spray either in the plenum. We have replaced the fuel pump twice, the computer, sensors, spider injector, pick up coil, plugs, wires, ignition switch. You only hear fuel pump come on when it's cranking and accessory doesn't work. The key is very worn and sometimes it's hard to tun. Would the ignition lock cylinder stop it from starting? I don't know what else to do. Anyone know of what else to do?

 

what brand pump did you put in it,if its not delphi or ac delco,ive had most aftermarket pumps dead on arrival or weak.

Sad.

 

it wasn't either of those but it was an expensive one. It was like 300.00. The first one was a cheaper one and it didn't work

 

what name brand was the pump? Delco or Delphi is what you need.

 

i'm fairly sure i have a factory pump on mine. when the key is turned on, you can hear an initial wine of the pump priming, and then it's quieter.

you're sure you're getting fuel?
could the fuel pressure regulator cause an issue this grand?

a lot of these guys on the forum call for a leak down / fuel pressure test. i believe 55 psi or thereabouts consistently and after ten minutes worth of running is desired.