1995 Chevy S-10 1995 S-10 fuel pump problem. Maybe?

KRIS1208

MEMBER
1995 CHEVROLET S-10
4 CYL
2WD
MANUAL
252,000 MILES

This thing is racking my brain. It works for a while, then the truck just cuts off. Nothing. After a while I can try it again and it works normally. I'm leaning toward the fuel pump, so I removed the bed from the truck and turned the key and I heard the fuel pump come on. And when it doesn't come on and I can not hear it humm right before I try to start, it won't start. Anyway I took a test light and checked the power at the pump making sure connections and the ground was ok. On the two wire plug, one wire had what appeared to be full voltage (12V) when I tagged the other wire the test light lit up about halfway, maybe 6V or so. Is that normal? Thanks for any help.

1 Reply

INTERNETMECHANIC

MECHANIC
700 POSTS

When the problem occurs, 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. The gray wire at the pump connector is voltage for the pump motor. The purple wire is voltage for the fuel gage sending unit. Engine cranking, take a voltage reading across battery posts, the reading at the gray wire, pump connector, engine cranking, won't be any higher. Right now, I don't care about the initial prime.