Fuel pump relay getting hot

THUNDER123

MEMBER
1999 CHEVROLET TAHOE
5.7L
V8
2WD
AUTOMATIC
200,000 MILES

Changed my fuel pump truck runs great for a few hours then my fuel pump relay gets hot and shuts down. I don't know why the pump is pulling too many volts. Could a bad gas cap be the problem? And since it shuts off when the relay gets hot does that mean the oil pressure switch is bad?

Monday, April 15th, 2019 AT 1:29 AM

1 Reply

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

Check the relay connectors for corrosion. Resistance causes components to heat up. Also the relay itself could be getting weak itself. A relay has to parts to it. It is nothing more than an electromagnetic switch. When electricity is supplied to an electromagnetic coil it is energized and pulls a switch closed, which completes a circuit and let's electricity flow to desired component. When the switch gets to weak to be held in place by the magnetism of the energized coil, it will intermittently fail. Switch out the relay for a new one and see if this solves your problem. Get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

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Wednesday, June 2nd, 2021 AT 2:35 PM