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#3295471 - 02/26/14 07:14 PM Re: Warning signs of a failing fuel pump [Re: GreeCguy]
GreeCguy Offline


Registered: 03/21/05
Posts: 2520
Loc: Elderly County, Florida
Thanks for the replies fellows. "Wonder the Thunder Pig" is currently at 153,000 and I noticed yesterday the pump seemed to be on the loud side. It also seems to labor under load, (climbing hills and accelerating from a stop). Pretty sure it's the original pump. Didn't know if it was me or if that was a warning sign of problems in the near future. I think for the sake of not being stranded in the middle of no where in the middle of the night, I'll be dropping the tank and replacing the pump this Saturday.
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#3295484 - 02/26/14 07:26 PM Re: Warning signs of a failing fuel pump [Re: GreeCguy]
yonyon Offline


Registered: 03/06/12
Posts: 3492
Loc: NJ, USA
Another sign of a fuel pump about to quit is feeling a sudden, inexplicable, and urgent need to completely fill up your gas tank even though it has enough gas in it already. If this happens you should not shut the engine down until you drive to wherever you're going to replace the pump. If you feel that you must fill up the tank right away and can't fight the urge you can leave the engine running while you fill up.

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#3295506 - 02/26/14 07:43 PM Re: Warning signs of a failing fuel pump [Re: Donald]
clinebarger Offline


Registered: 12/19/13
Posts: 240
Loc: Fort Worth, Texas
Originally Posted By: Donald
Buying a GM vehicle.


The Lift pumps on 24v Cummins engine's are known for their reliability....Right??? The fact it takes out the Injection Pump if ran too long is just icing on the cake.

Back on track....When was the last time the fuel filter changed? A clogged filter will make the pump louder.
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#3295589 - 02/26/14 09:13 PM Re: Warning signs of a failing fuel pump [Re: clinebarger]
GreeCguy Offline


Registered: 03/21/05
Posts: 2520
Loc: Elderly County, Florida
Originally Posted By: clinebarger
[quote=Donald]Back on track....When was the last time the fuel filter changed? A clogged filter will make the pump louder.



Just changed it about a month ago.
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#3295613 - 02/26/14 09:41 PM Re: Warning signs of a failing fuel pump [Re: yonyon]
Vikas Offline


Registered: 07/22/05
Posts: 8446
Loc: NorthEast
Originally Posted By: yonyon
Another sign of a fuel pump about to quit is feeling a sudden, inexplicable, and urgent need to completely fill up your gas tank even though it has enough gas in it already. If this happens you should not shut the engine down until you drive to wherever you're going to replace the pump. If you feel that you must fill up the tank right away and can't fight the urge you can leave the engine running while you fill up.
Knowing you, I think you are joking. I presume you expect having to drop the tank to replace the fuel pump and by Murphy's Law, you will need to do it just when the gas tank is completely full!

But then again, sometimes you are serious, so one never knows!

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#3295630 - 02/26/14 09:51 PM Re: Warning signs of a failing fuel pump [Re: clinebarger]
Donald Offline


Registered: 03/21/04
Posts: 13760
Loc: Upstate NY
Originally Posted By: clinebarger
Originally Posted By: Donald
Buying a GM vehicle.


The Lift pumps on 24v Cummins engine's are known for their reliability....Right??? The fact it takes out the Injection Pump if ran too long is just icing on the cake.

Back on track....When was the last time the fuel filter changed? A clogged filter will make the pump louder.



I have an AirDog to go in to replace the current lift pump.

Cummins did their best to make a great engine, and Dodge did their best to screw it up with a poor lift pump, then moved it into the tank and still more problems.
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#3295644 - 02/26/14 10:01 PM Re: Warning signs of a failing fuel pump [Re: GreeCguy]
TooManyWheels Offline


Registered: 02/21/03
Posts: 3695
Loc: Houston, Tex
A mechanic who is up on the technology can monitor the waveform of the pump circuit with a scanner and tell when it is underperforming, i.e. about to die. I don't have a link handy, but it shouldn't be hard to find.

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#3295686 - 02/26/14 10:36 PM Re: Warning signs of a failing fuel pump [Re: Vikas]
yonyon Offline


Registered: 03/06/12
Posts: 3492
Loc: NJ, USA
Originally Posted By: Vikas
I presume you expect having to drop the tank to replace the fuel pump and by Murphy's Law, you will need to do it just when the gas tank is completely full!

But then again, sometimes you are serious, so one never knows!


I'm serious this time.

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#3295688 - 02/26/14 10:41 PM Re: Warning signs of a failing fuel pump [Re: TooManyWheels]
yonyon Offline


Registered: 03/06/12
Posts: 3492
Loc: NJ, USA
Originally Posted By: TooManyWheels
A mechanic who is up on the technology can monitor the waveform of the pump circuit with a scanner and tell when it is underperforming, i.e. about to die. I don't have a link handy, but it shouldn't be hard to find.


This is pretty much true, but requires an oscilloscope or equivalent tool. Some scan tools will have that built in, but not all and not any cheap ones.

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#3295840 - 02/27/14 06:55 AM Re: Warning signs of a failing fuel pump [Re: Donald]
George7941 Offline


Registered: 05/10/05
Posts: 1497
Loc: Toronto, Canada
Originally Posted By: Donald

Cummins did their best to make a great engine, and Dodge did their best to screw it up with a poor lift pump, then moved it into the tank and still more problems.


The blame for the lift pump goes to Cummins, not Dodge. Cummins supplied the Carter-sourced lift pump mounted on the block. I agree that Dodge's in-tank pump wasn't very good.
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2006 GMC Sierra 4.3l, NV3500,G80 locker rear, Formula Shell Synthetic 5W30, Wix 51036, Dexcool.
1987 BMW R80

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#3296130 - 02/27/14 11:13 AM Re: Warning signs of a failing fuel pump [Re: yonyon]
Vikas Offline


Registered: 07/22/05
Posts: 8446
Loc: NorthEast
Originally Posted By: yonyon
Originally Posted By: TooManyWheels
A mechanic who is up on the technology can monitor the waveform of the pump circuit with a scanner and tell when it is underperforming, i.e. about to die. I don't have a link handy, but it shouldn't be hard to find.


This is pretty much true, but requires an oscilloscope or equivalent tool. Some scan tools will have that built in, but not all and not any cheap ones.
And frankly, if I ever see a real mechanic who gets paid on the flat rate ever did that in a real life (vs youtube) I would probably die of heart attack! Seriously, driveablity specialist are extremely rare breed and you won't find them employed by a corner gas station or a generic car dealer.

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#3296620 - 02/27/14 06:24 PM Re: Warning signs of a failing fuel pump [Re: Vikas]
yonyon Offline


Registered: 03/06/12
Posts: 3492
Loc: NJ, USA
The best driveability guy I ever knew was working at a gas station when I met him, but he was salaried, not on flat rate. I worked with him for a few years and in that time I never saw him put the scope on a fuel pump.


Edited by yonyon (02/27/14 06:24 PM)

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#3296894 - 02/27/14 11:08 PM Re: Warning signs of a failing fuel pump [Re: GreeCguy]
artificialist Offline


Registered: 09/23/07
Posts: 7043
Loc: Florida
sometimes when a car doesn't start due to a failed fuel pump, you can smack the gas tank, and it will make the pump work again.

But you can't count on this method.
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#3296936 - 02/28/14 01:07 AM Re: Warning signs of a failing fuel pump [Re: GreeCguy]
Nick R Offline


Registered: 07/14/09
Posts: 10674
Loc: NEO
Our expedition had no warning. Just started, chugged for a few seconds, and then died. Fortunately it was right across the street when this happened, but it gave me no warning when it did.
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