Weird Intermittent Fuel Issue

[Yfz450jrc]

I'm running into a weird intermittent fuel delivery issue on my 1994 GMC Yukon. Can anyone help?

I replaced my rusted gas tank with a new gas tank and fuel pump.

It was running fine in the garage, but when I pulled it out, it stalled. I tried starting it but the fuel pump wasn't kicking on. So, I replaced the fuel pump relay and everything seemed fine. I pulled it back in the garage and it died.

I am able to to disconnect the battery for 60 seconds and the fuel pump will start working again for several minutes. After a few minutes running, it then dies again and the fuel pump wont kick on again unless I disconnect the battery for 60+ seconds.

Is my new fuel pump and or fuel pump relay faulty? Is something causing my relay to have problems? Perhaps a bad ground or wiring problem?

 

[Caman96]

You sure fuel pump ground is connected to a cleaned area on frame and TIGHT?

 

[Schurkey]

Multiple potential causes. Loose connections would be high on the list.

IF (big IF) this is traceable to the fuel pump relay, you've also got a fault at the oil pressure switch, because the oil pressure switch should bypass the relay when the engine has oil pressure.

 

[1997]

OBD1 can set codes without check engine light coming on,

any codes?

 

[Yfz450jrc]

You sure fuel pump ground is connected to a cleaned area on frame and TIGHT?

Seems so. I'll try cleaning the frame better and tighten it real good though

 

[Yfz450jrc]

Multiple potential causes. Loose connections would be high on the list.

IF (big IF) this is traceable to the fuel pump relay, you've also got a fault at the oil pressure switch, because the oil pressure switch should bypass the relay when the engine has oil pressure.

Thanks. Would it make sense to replace the oil pressure switch for good measure?

 

[Yfz450jrc]

OBD1 can set codes without check engine light coming on,

any codes?

Had no idea it could throw codes without a check engine light. I'll check that too.

 

[Schurkey]

Thanks. Would it make sense to replace the oil pressure switch for good measure?

Test it, replace if faulty. Could be a wire-harness issue as easily as the switch itself.