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Installed new fuel pump and still no fuel pressure to crank?

Tiny
FREDMAC2018
  • MEMBER
  • 2008 GMC ACADIA
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Installed new fuel pump and still no fuel pressure to crank. Fuses and relays are good. Is there a crank relearn I have to perform after changing pump?
Monday, March 12th, 2018 AT 11:02 AM

13 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

No, there is not re learn. It is a plug and play.

Did you verify power to the pump prior to replacing it?

Roy
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Monday, March 12th, 2018 AT 1:36 PM
Tiny
FREDMAC2018
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  • 7 POSTS
No I did not. I guess I will have to drop the tank again and check it.
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Monday, March 12th, 2018 AT 2:20 PM
Tiny
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  • MECHANIC
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Before you do that, I attached a diagram for you to view to be sure you are getting power to the pump. At the fuel pump relay, jump terminals 30 and 87 and see if the pump runs. Here are the engine and fuel pump wiring diagrams so you can see how the system works. Check out the images (Below). Please let us know what happens.
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Monday, March 12th, 2018 AT 2:44 PM
Tiny
FREDMAC2018
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Okay thanks. I will try it today.
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Tuesday, March 13th, 2018 AT 12:25 AM
Tiny
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Keep me updated.
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Tuesday, March 13th, 2018 AT 2:41 AM
Tiny
FREDMAC2018
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  • 7 POSTS
It turned out to be the wiring harness was bad. I have ordered a new one. Thanks
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Friday, March 16th, 2018 AT 2:38 AM
Tiny
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Good find.

You are welcome.

Roy
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Friday, March 16th, 2018 AT 2:44 AM
Tiny
FREDMAC2018
  • MEMBER
  • 7 POSTS
I think the root of the problem is water getting inside the connectors on all four doors. After a good rain I have to unplug them all and drain the water. What would you suggest on this problem?
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Friday, March 16th, 2018 AT 9:54 AM
Tiny
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Which connectors? Where?
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Friday, March 16th, 2018 AT 9:56 AM
Tiny
FREDMAC2018
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  • 7 POSTS
The speaker connectors that plugs in on all four doors.
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Friday, March 16th, 2018 AT 3:02 PM
Tiny
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Try sealing the area they go through with some windshield sealer. That will resist water.
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Friday, March 16th, 2018 AT 3:36 PM
Tiny
FREDMAC2018
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Thanks.
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Friday, March 16th, 2018 AT 4:44 PM
Tiny
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You are welcome.
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Friday, March 16th, 2018 AT 4:48 PM

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