Truck dies at 1/4 tank of fuel - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 13 (permalink) Old 01-15-2020, 04:53 PM Thread Starter
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Truck dies at 1/4 tank of fuel

Hi everyone. So i have an issue of my truck dying when the fuel tank just reaches 1/4 tank. At first, i hadnt put that fact together yet, and i was looking at fuel lines and the filter housing for leaks. When i filled the tank, it had no issues and ran perfectly.....until it hit 1/4 tank again, then it just drops off like its out of fuel. I pulled the tank to see if the sending unit had a crack in the pick up yube, but it looked fine. Could the Cp3 pump cause this, like maybe getting weak? I should also add that this is a totally stock truck with no tuner. Tia for any suggestions or advice.



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post #2 of 13 (permalink) Old 01-15-2020, 05:08 PM
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Gauge might just be off tbh. Cp3 shouldnt cause it to die at 1/4 tank.
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post #3 of 13 (permalink) Old 01-15-2020, 05:30 PM Thread Starter
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I thought about that, but i used to get close to 400 miles to a tank of fuel, but since this has started im only getting around 300.....which would make sense if i still have 1/4 tank of fuel left. I didnt know if the Cp3 would be possibly on its way out, therefore not able to pull fuel up that far anymore, causing it to die. Hell, i dunno?



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post #4 of 13 (permalink) Old 01-15-2020, 06:17 PM
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How many gal. to fill it when it runs out?

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post #5 of 13 (permalink) Old 01-15-2020, 06:54 PM
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Quote:
I pulled the tank to see if the sending unit had a crack in the pick up yube, but it looked fine.
Did you test it?
Visual inspect won't catch a leak in the fuel module.

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post #6 of 13 (permalink) Old 01-15-2020, 06:57 PM Thread Starter
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Ill have to really check next time i fill up. I know it doesnt take as much as it used to but ill get a good number tomorrow.



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post #7 of 13 (permalink) Old 01-15-2020, 06:59 PM Thread Starter
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I did not test it other than look for cracks in the pick up line. I didnt see any place that it could be sucking air though.



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post #8 of 13 (permalink) Old 01-15-2020, 07:02 PM
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Cracks in the welds on the top side of the module, suck air at lower fuel levels.

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post #9 of 13 (permalink) Old 01-15-2020, 07:26 PM Thread Starter
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Quote:
Originally Posted by Hook'em_Horns! View Post
Cracks in the welds on the top side of the module, suck air at lower fuel levels.
Hmmmm....maybe ill drop it again and look. Is there a piece of specific test equipment or method to test this other than sucking off my tank? Is there some sort of pressure tester or vacuum tester?



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post #10 of 13 (permalink) Old 01-15-2020, 07:34 PM
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Pull a vacuum on it, or apply psi to it.
Honestly, with the age and labor involved to get to it, I'd swap in a new one from Rock.

It can also leak from the seal failure in the quick connect line attaching to the nipple on top. This is normally removed and replaced with bulk fuel line and a clamp, when installing most lift pumps.

You might consider installing a JK pump at the same time you're into it. Positive pressure pushing forward will help overcome issues with vacuum finding leaks, or hoses collapsing in the bends. $30 more for a filter head, you can add a FWS filter to the setup too, greatly prolonging the life of the stock filter under the hood and adding more filtration protection.

Some ideas here;
https://www.duramaxforum.com/forum/d...-pump-kit.html

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Last edited by Hook'em_Horns!; 01-15-2020 at 07:39 PM.
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