Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi There, I'm Clayso a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
From your description sounds like the problem is in the Underhood Bussed Electrical Center (UBEC). With a test light verify the #24 30a GAS FUEL PUMP fuse has power during cranking and initially turning on the key. If there is no power at the fuse then obviously there will be no power on the gray wire out to the pump.
When you first turn the key on listen for the fuel pump relay to click. If the relay doesn't click remove the relay and verify battery voltage on pins 30 and 85. There should be power at all times on pin 30 and for about 2 seconds on pin 85 just after turning the key to the on position. If you have power at the relay connector you can jump pins 30 and 87 and see if the fuel pump energizes. If the fuel pump does not energize with 30 and 87 jumped let me know, I'll have to put together a diagram for the location of the gray wire from the UBEC. Also let me know the first 10 of the VIN to assure vehicle accuracy. The fuel pump relay should have numbers 30, 85, 86 & 87 stamped on the relay.
Let me know.Thanks
BTW, I can't answer as to why the van hates you. I do know they have more reason to hate me from all of the words I've had with them over the years.
The #24 fuse will not have power until the relay is energized. The link below is a circuit diagram for the fuel pump and the fuel pump relay.
Fuel Pump Relay Circuit
I'm pretty sure the problem is going to be found at the X2 connector on the B1 terminal. This is the gray wire coming out of the UBEC and going to the fuel pump. What I've seen is with the relay jumped and power through the fuse there is not enough current to power the fuel pump. I always check this circuit with a headlamp as a test light. I see you have some pretty wild voltage readings 16v and 14v. Voltmeters won't load circuits and in my opinion cause more confusion than solutions. Jump the relay and verify battery voltage at the #24 fuse and then verify battery voltage on the gray wire at the pump.
Let me know what you find.Thanks
Hi there, just checking to see if you found power to the fuel pump yet.
Let me know.
Positive ratings are greatly appreciated.