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Old 09-06-2009, 08:31 PM   #1
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Question Fuel Tank Heater?

I was underneath the GMC today looking at how everything was arranged/constructed when I noticed a box about an inch away from the front end of the fuel tank that looked like it could be a small radaitor, possibly to help heat the fuel tank during cold weather. There are two metal pipe lines connected to the box. I didn't have anything like this on my 96 PSD. The only fuel heater I was ever aware of it having was electric and located in the bottom of the canister that holds the fuel filter (I know because I had to replace the heater once).

I searched the Diesel Place but didn't find anything.

So, is this GM's solution to heating the fuel in winter?

If this isn't a heater, then what is it?
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Old 09-20-2009, 08:52 PM   #2
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Now you've got me curious. I never knew about this, so tomorrow I'll be under my dually looking for that box. There is another website dedicated to Duramax trucks: http://www.duramaxforum.com/forum/index.php.
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Old 09-21-2009, 05:05 PM   #3
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Hi, Ray:

Why wait for tomorrow? I wiggled under the truck this evening and took photos from various angles. I think this one might be the best of the bunch as it shows the fuel tank, the little radiator and the air gap between them. The two metal tubing lines from that radiator run along the inside of the frame towards the front of the truck. I have not yet traced where they go.



Hope this helps.
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Old 10-20-2009, 02:01 AM   #4
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Hello what you see before your fuel tank is the cooler that cools the fuel returning from the engine before entering the fuel tank. Its is unused fuel coming back from the injectors and the fuel is hot so they cool it down.
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Old 10-24-2009, 08:49 PM   #5
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Frank, I found out the fuel heater is in the fuel filter housing, left of the primer cap.
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Old 05-04-2011, 10:12 AM   #6
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Correct on both accounts; the fuel heater is in the filter mount block and the "radiator" thing in front of the tank is the fuel cooler.

Interestingly enough, the new LML Dmax engines do not have the fuel cooler. Makes one wonder if it's not needed, or not effective ...
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