No power to fuel pump

2002 CHEVROLET SILVERADO
210,265 MILES • 4.8L • V8 • 2WD • AUTOMATIC
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CRAZYCARL
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  • 4 POSTS
Can I just hotwire the fuel pump? I want to run a toggle switch to the fuel pump so I can turn it off and on with the toggle switch. can I do that?
Nov 2, 2020 at 6:41 AM
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ASEMASTER6371
  • Experienced Mechanic
  • 52,796 POSTS
Good evening,

Yes, you could do it, but before you do that can you do a couple quick checks?

I attached the diagram for you to view of the fuel pump circuit. You need to go to the relay and do some testing. You need to verify voltage to the relay for operation.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check for one terminal with voltage all the time. Then there should be another one that needs voltage only for 2 seconds when you turn on the key.

Roy
Nov 2, 2020 at 7:29 AM
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CRAZYCARL
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What do I do after I check the this is in the relay and check the amps on it.
Nov 6, 2020 at 10:19 PM
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CRAZYCARL
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And how would you run the toggle switch? would you run it straight from the battery for a hot wire to the hot wire to the fuel pump?
Nov 6, 2020 at 10:19 PM
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ASEMASTER6371
  • Experienced Mechanic
  • 52,796 POSTS
You check voltage not current at the pump.

Yes, a hot from the battery to the switch and the other wire to the pump.

Did you check the relay?

Roy
Nov 6, 2020 at 10:27 PM
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CRAZYCARL
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Yes, I checked the relay and guess what I went through the whole system again and I got everything working proper it's running rough. I think I need a fuel filter and change my oxygen sensors out. but thanks for your help I might have more questions later take it easy Roy.
Nov 8, 2020 at 1:43 AM
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ASEMASTER6371
  • Experienced Mechanic
  • 52,796 POSTS
You are welcome.

Always glad to help.

Roy
Nov 8, 2020 at 2:22 AM
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