BADASS of New England
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BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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Most users ever online was 182 on Thu May 27, 2021 9:57 pm
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 Fuel pump relay ground issue

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3 posters
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GasTT

GasTT


Posts : 2675
Join date : 2009-01-19
Age : 36
Location : Treasure Coast, FL

Fuel pump relay ground issue Empty
PostSubject: Fuel pump relay ground issue   Fuel pump relay ground issue EmptyMon Jun 03, 2013 6:47 pm

Working on a RMW for somebody. Fuel pump not working. I applied 12v to the test lead and got nothing. Diagnostics point toward fuel pump relay ground. I applied 12v to the test lead while grounding the sending unit right at the connector, still nothing. I know the pump is dead. But still, the relay is not grounding. Cleaned the drivers head front grounds at the coil still nothing. Any ideas?
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sdstick

sdstick


Posts : 4292
Join date : 2009-03-20
Location : Revere, MA

Fuel pump relay ground issue Empty
PostSubject: Re: Fuel pump relay ground issue   Fuel pump relay ground issue EmptyMon Jun 03, 2013 10:13 pm

Drivers side kick panel ground is maybe the relay

Not sure where the sender ground is on a wagon...never looked...sorry

When you put 12v on the prime wire do you have 12V at the pump connector?

Check 12V to any ground back there

If you get 12V Make your own ground & see if the pumps any good
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GasTT

GasTT


Posts : 2675
Join date : 2009-01-19
Age : 36
Location : Treasure Coast, FL

Fuel pump relay ground issue Empty
PostSubject: Re: Fuel pump relay ground issue   Fuel pump relay ground issue EmptyTue Jun 04, 2013 10:15 am

I have power at the rear connector grey wire when connected to the test lead. I applied 12v and ground directly to the pump side of the harness today and nothing. GWS fuel pump.
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sdstick

sdstick


Posts : 4292
Join date : 2009-03-20
Location : Revere, MA

Fuel pump relay ground issue Empty
PostSubject: Re: Fuel pump relay ground issue   Fuel pump relay ground issue EmptyTue Jun 04, 2013 10:27 am

Exactly

Hopefully fuel connections, straps & bolts are still servicable

Did 2 (Matts & mine) in 4 hours the other day

Took me 1/2 hour (+) to eventually yank the 3/8 connection apart on my DD

Whoever replaced it bent 1 of the 4 legs of the internal snap retainer ( OEM metal connection)....SOB...not much blood when it let go luckily... Laughing

I also had to balance the heat shields during re-install because of how Matts exhaust runs...PIA

I was SOoooo happy I had anti-siezed every bolt in Matts & my DD wasnt beyond.

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boojum




Posts : 2182
Join date : 2009-01-21
Age : 36
Location : NH

Fuel pump relay ground issue Empty
PostSubject: Re: Fuel pump relay ground issue   Fuel pump relay ground issue EmptyTue Jun 04, 2013 8:41 pm

GasTT wrote:
I have power at the rear connector grey wire when connected to the test lead. I applied 12v and ground directly to the pump side of the harness today and nothing. GWS fuel pump.

Try to reverse the polarity briefly and back a few times.
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GasTT

GasTT


Posts : 2675
Join date : 2009-01-19
Age : 36
Location : Treasure Coast, FL

Fuel pump relay ground issue Empty
PostSubject: Re: Fuel pump relay ground issue   Fuel pump relay ground issue EmptyTue Jun 04, 2013 11:09 pm

Ill give it a shot
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