After replacing fuel pump injectors do not spray

Tiny
BIGJOE0096@GMAIL.COM
  • MEMBER
  • 1988 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
I just changed my fuel pump on my truck an the fuel injectors wont spray. They worked before the old fuel pump went out.

Truck is a c1500.
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Saturday, July 6th, 2019 AT 9:55 PM

3 Replies

Tiny
STEVE W.
  • EXPERT
Welcome to 2CarPros. From your description it sounds like the replacement pump isn't operating. Can you hear the pump turn on? To test if power is getting to the pump you can use terminal G in the under dash connector. If you jumper from that terminal to battery positive it will send power directly to the pump, bypassing the relay and the oil pressure switch. If the engine now starts and runs there is a problem in the power through either the relay or the OP switch. If you hear nothing and it doesn't start then it is likely there is a problem with the pump or the wiring at the pump. That may also be why the old pump stopped, not that the pump was bad but that there is no power to it.
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Saturday, July 6th, 2019 AT 11:04 PM
Tiny
BIGJOE0096@GMAIL.COM
  • MEMBER
There is power going to the pump I took the gas line that goes to the fuel injectors off and there was gas before and after turning the key over to start the truck.
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Sunday, July 7th, 2019 AT 12:08 AM
Tiny
STEVE W.
  • EXPERT
If you have fuel you will want to test the pressure. The injectors need around 10 psi minimum to operate. If you have that pressure but they still don't spray the injectors may be bad or there may not be a signal going to them. For that you use a noid light and plug it into the injectors control wire.
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Sunday, July 7th, 2019 AT 4:17 AM

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