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Why doesnt my replaced fuel pump not work?

Tiny
RECAP
  • MEMBER
  • 2001 CHEVROLET IMPALA
  • 165,435 MILES
I replaced the fuel pump, fuel filter, and now im not getting and fuel. I have spark and from what I can see the crank shaft sensor is ok, and I had the relay checked and its fine. Im at a stand still and I cant figure out what else to do? Thanks.
Thursday, December 15th, 2011 AT 10:48 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check if the injectors are pulsing
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Thursday, December 15th, 2011 AT 10:50 PM
Tiny
RECAP
  • MEMBER
  • 3 POSTS
They are pulsing right at 12volts
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Thursday, December 15th, 2011 AT 11:07 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Power the fuel pump from the battery to the fuel pump wiring connector and see what happens
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Thursday, December 15th, 2011 AT 11:19 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Did you check for power and ground when you were at the fuel pump connector, and possibly even look at the connector itself for terminal or heat damage?
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Thursday, December 15th, 2011 AT 11:21 PM
Tiny
RECAP
  • MEMBER
  • 3 POSTS
Yes there is power going to the pump, I checked after I checked the injectors. I think it could be a bad pump.
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Friday, December 16th, 2011 AT 12:00 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
[quote]they are pulsing right at 12volts[/quote]

Injectors are not controlled through power. They get a pulsing ground signal and you need to use a noid light to test that.
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Friday, December 16th, 2011 AT 12:02 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
What ground source did you use to determine power to the pump, the circuit ground. Have you load tested the ground circuit?
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Friday, December 16th, 2011 AT 12:03 AM

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