Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
What is it that you are trying to do? If you are testing the fuel pump electrical circuit, the gray wire that goes to the top of the tank is the pump voltage lead and should have voltage when you first turn on the key and start cranking the motor. If you look at the diagram below, that is the gray wire on the left side that goes to the fuel pump sender assembly. Sometimes even if these pumps run, they do not develop enough fuel pressure to open the poppet valves on the injectors. These system are really pressure sensitive and just a couple of pounds under is enough to keep them from running. Your system need 60 to 66 pounds at key up to start the truck. You can rent a pressure gage from any parts store and Auto Zone has a loan a tool program that only requires a deposit. The gage just screws on the valve (looks like a tire fill valve) on the fuel injector rail. Thanks and good luck.
Hi Bill, I am now having problems with MSN and had to come back on through Internet Explorer, so don't be surprised if you loose me, but I will get back on sooner or later. I would like you to check with the dealer and see if the part numbers on the fob will give us an idea of if it is a late model fob or an early one. Then we should be able to decide which style lock cylinder to use. If it is the old style with 2 small white wires going to the lock cylinder we may be able to bypass the system for ever. Read what I was just getting ready to post and we will go from there. I have to leave for a few hours now, but will be back before bed time. We should be able to work this out somehow. Thanks
If they did the system the way I think they did the 30 minute program in the post below may do the job. If that won't work, you may need to have the dealer install his tester on the van and read the resistance value on the system and then maybe we can solder a resistor in the line to bypass the system permanently. I am still waiting for a couple of other opinions on the best way to approach this with out causing you more problems.