Question about 1994 Chevrolet S-10 Blazer
Drove the truck, parked it. Came back and tried to start it, turned over fine, did not start. Checked spark, great, jumping nearly an inch from the screwdriver to the engine. Check fuel pressure, none, zero. (Just put a new one in two years ago from Car Quest, genuine Delphi GM unit). Never, never use Auto Zone or advance auto fuel pumps. They are junk and might last past the warranty of 1 year, but not in my case. Scream loudly. I could not hear the Delphi unit unless I took off the gas cap. Anyway, I checked for voltage at the plug before it goes into the tank. I had 12 volts to ground. So I changed the pump again. A new Delphi unit sold to me at cost. Carquest could not honor my warranty but treated me well, $76.00 for pump and sock, instead of $110. The pump did not work. I checked voltage at the plug where it plugs onto the pump, I had 12 volts across the plug. I ran out of time but checked the old pump with the new pigtail that came with the new pump, just across the battery terminal and it ran perfect. I checked the new pump, it ran perfect. Checked again at the plug at the fuel pump, terminals were good and I again had 12 volts acroos the plug contacts with the key in the on position. Two pumps that work good at the battery, but not in the tank with 12 volts present at the plug, in any position, ruling out the chance of a short. Twisted and turned the pump but it failed to run while plugged in at the fuel tank.
I am have the exact same problem but my ground seems to be intact and getting a good ground. Do you have any other ideas on what may be cause the Fuel pump not to kick on?
Posted on Oct 13, 2009
If you have power to the pump and it is not working, then you have a broken ground wire from the pump to the vehicle frame. To verify this, get a multi meter and set it to ohms. Put one lead in the negative side of the harness and the other lead to the vehicle frame. Make sure the frame is bare metal. You should have very little resistance. If it shows "OL," then the ground is open..or broken. Hope this helps.
Posted on Feb 15, 2009
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Posted on Jan 02, 2017
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