on this truck it cranks but will not start this is what i did so far i pulled the wire off the ignition coil it sparks blue, i pulled the spark plug wire and there is spark out of the wire, and fuel pump is working i can hear the buzz when the ignition is on alswo when i open the fuel valve test port only little gas comes out whats next is it the fuel pressure regulator or ignition control module what can it be
2000 gmc jimmy 4.3liter?
- Thread starter John
- Start date
Molson02536
New member
Most likely your fuel pump is bad and will need to be replaced. You should have 62-65 PSI of fuel at the shredder valve, anything less and your fuel injector will not work. What ever you do, DO NOT PUT GAS DON THE THROTTLE BODY. If you ending with a upper intake fire or backfire from starter fluid, good chance your going to have to replace your fuel injector system.
You use Carb cleaner to see if you can get your engine to run till the carb cleaner runs out. The Carb cleaner is less volatile then starter fluid and keep your upper intake from exploding from a backfire.
Once you have determined that you do not have enough fuel pressure, inspect the ground wire to your fuel sending unit. Common for the ground wire to corrode off the frame and cause your fuel pump to be weak. If that is good, then go ahead and replace the sending unit and wire harness too for insurance that you'll not have any issues related to a broken fuel sending unit wire harness.
Good luck and be safe, keep us posted.
