Truck dies at 1/4 tank of fuel - Page 2 - 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 #11 of 13 (permalink) Old 01-15-2020, 07:47 PM Thread Starter
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Originally Posted by Hook'em_Horns! View Post
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
I almost ordered a new sending unit from Rockauto, but after i pulled the tank and didnt find anything, i kind of dismissed that idea. If it had a leak near the welds though, wouldnt that cause it to suck air at all fuel levels? It may still be the sending unit, but ill test it first when i have time to go through that again.



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post #12 of 13 (permalink) Old 01-15-2020, 07:54 PM
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If you've had it long enough to know your range, and you've suddenly lost 100 miles on a tank, I don't think it's the sending unit with bad info.

At higher tank levels, the draw pressure isn't as much and any air mixed in goes unnoticed. But at lower levels, the beast raises it's ugly head. Like a drink straw with a split in it.

Usually this shows up as a fuel limp 1st, instead of just dead on the road though.

Another thing to consider too.....was there anything in the basket when you pulled it?
It's not unusual to see an additive cap seal get dropped in the tank, float around for years until it finally gets trapped in the basket at lower levels, randomly being sucked to the teat and causing problems.

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Last edited by Hook'em_Horns!; 01-15-2020 at 07:56 PM.
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post #13 of 13 (permalink) Old 01-15-2020, 08:04 PM Thread Starter
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Quote:
Originally Posted by Hook'em_Horns! View Post
If you've had it long enough to know your range, and you've suddenly lost 100 miles on a tank, I don't think it's the sending unit with bad info.

At higher tank levels, the draw pressure isn't as much and any air mixed in goes unnoticed. But at lower levels, the beast raises it's ugly head. Like a drink straw with a split in it.

Usually this shows up as a fuel limp 1st, instead of just dead on the road though.

Another thing to consider too.....was there anything in the basket when you pulled it?
It's not unusual to see an additive cap seal get dropped in the tank, float around for years until it finally gets trapped in the basket at lower levels, randomly being sucked to the teat and causing problems.
All i saw was just a little bit of stuff on the screen, but it was 97% clear. No signs of any type of blockage. I think there may be a small crack in the tube that i missed when i looked at it, but i felt pretty confident when i put it back in. But its worth a second look. I sure dont want to do it a third time, so i may just get a new sending unit and at least i can eliminate that as a possible cause down the road. Luckily, i keep a 5 gallon can of diesel in my truck box, so at least im not stuck for long!
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