1996 Chevy Tahoe Fuel System

NICKC23PA

MEMBER
1996 CHEVROLET TAHOE
V8
2WD
AUTOMATIC
130,000 MILES

The fuel pump is not engaging. Last month the truck broke down and was not getting fuel. After replacing the fuel filter, the relay, and then the fuel pump it started right up. After starting it a few times and then driving it home(about 10 miles) I parked it in my driveway for about 15 minutes. When I got back in, it wouldn't start. The fuel pump isn't turning on. I recently plugged a scanner under the dash, but there were no codes flagged. What could stop the fuel pump from recieving power other than the relay or wiring harness, after driving it 10 miles with no problems?

2 Replies

JDL

MECHANIC
16,098 POSTS

Welcome, you need to use a gage and check fuel pressure. Some of the national brand autostores used to loan out a fuel pressure gage, if you don't have one.

There shows to be an oil pressure switch in fuel pump circuit. It's just redundant power supply to the pump, wired in parallel with the relay. If that switch is functional and has voltage, once you crank it enough to bring up oil pressure, the switch closes and the pump will run, even without the relay. Without the relay there won't be an initial prime.

Are you missing anything besides fuel. You have spark at the plugs and injector pulse, engine cranking?