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Old 07-12-2019, 10:18 AM   #1 (permalink)
Mmcclos08
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Duramax Suburban Fuel Cooler

Hello all, long time Lurker, first time poster. I have been researching the duramax conversions here for a long while and am currently working on my own swap. (2002 LB7 into 2001 Burb 2500) One question I have is regarding the fuel cooler. Given the limited space in the suburban, has anyone tried something like a Derale 2 pass fuel cooler on ebay instead of a factory duramax cooler? not sure if the 20 inch would cool as well or if can handle the return flow? Seems it would be easier to keep clean and mount along the frame rail.

Thanks for any help!

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Old 07-15-2019, 01:08 AM   #2 (permalink)
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The factory fuel cooler does a poor job of cooling. The Derale 26" 2 pass heat sink cooler does a much better job. A quality built cooler behind the grille would provide the best results.

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Old 07-15-2019, 08:54 PM   #3 (permalink)
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Derale 12730 from summit racing is what I used in place of the factory unit on my conversion. I mounted it to the rear crossmember in front of the fuel tank on the driver side. It is mounted at an angle with the top leaning forward to avoid contact with the body. I only run the fan when pulling my 10k travel trailer here in the Appalachian mountains. Highest fuel temp I have seen on my Edge is 177 degrees. That is when the tank is low, and I’m running 72-74 mph, outside temp was 90 degrees and the humidity was almost 80%.
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Old 07-16-2019, 08:29 AM   #4 (permalink)
Mmcclos08
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Thanks for the replies guys, that is very helpful. I was thinking of doing a fan on the factory cooler but for the price, the derale sounds like a better unit.

Burb2LBZ, I see you are in PA also, do you have any advice on registering this when I am done? I have seen some posts of other states varying from total PITA to "I just take it to my mechanic and he puts a sticker on". I am curious what you went through. Of course, it probably depends if you live in an emissions county which I do (Washington).

Here are some pics of where I am waiting on the mobile blasting guy so I can start my way back up. I started this about 3 weeks ago but have only been working weekends and couple week nights after work:
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Old 07-16-2019, 10:45 PM   #5 (permalink)
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I am in Fayette county so no emissions testing here. Guy that does my inspections doesn’t even realize that it is not a factory option so he just checks the typical brakes and lights and puts on a new sticker. I am not sure what you may encounter in the emissions testing area. Wish I could be more help.
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Old 07-16-2019, 10:53 PM   #6 (permalink)
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Being so close, let me know if I can help in any way, I know the wiring is a bit different for you LB7 vs my LBZ, but may be able to assist if you run into any issues. Also...if you don’t plan on using that HD hood off the truck I am looking to pick one up for my burb 😉
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Old 07-17-2019, 07:43 AM   #7 (permalink)
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Thanks Burb2LBZ, I actually grew up in Belle Vernon near the Fayette county line, I appreciate the offer and will surely let you know if I run into any snags. Haven't decided on the hood yet, I am thinking I am going to use the HD hood, but I have to see how it looks. If I dont use it, I will definitely let you know. It needs buffed since it sat under some trees most of its life, but it is in really nice shape otherwise.
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Old 07-18-2019, 11:55 AM   #8 (permalink)
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Given GM removed the fuel cooler in 2011 and has yet to bring it back, I decided to leave it out on my 2003 Suburban conversion. I've put about 40,000 miles on it, and while I don't tow heavy with it (I have my truck for that), I never see high fuel temps.

Interestingly, my truck (which has the factory cooler) sees higher fuel temps than the Suburban. I regularly see 180+F on the truck, but the Suburban stays in the 140-160 range. I am not convinced the fuel cooler actually does anything at all.
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Old 07-18-2019, 12:59 PM   #9 (permalink)
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Quote:
Originally Posted by DAVe3283 View Post
Given GM removed the fuel cooler in 2011 and has yet to bring it back, I decided to leave it out on my 2003 Suburban conversion. I've put about 40,000 miles on it, and while I don't tow heavy with it (I have my truck for that), I never see high fuel temps.

Interestingly, my truck (which has the factory cooler) sees higher fuel temps than the Suburban. I regularly see 180+F on the truck, but the Suburban stays in the 140-160 range. I am not convinced the fuel cooler actually does anything at all.
GM brought the fuel cooler back for the L5P. Since fuel temps are read at the engine in the return line the differences could be possibly with the truck injectors returning more fuel. The factory fuel cooler is not very good and it is mounted in a poor spot. At the very minimum you want to keep fuel temps below 140*. Fuel temps below 140* will yield better performance, MPG, and keep the asphaltenes from dropping out the fuel and slowly plugging your fuel filter with tiny lil black specs.
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2006 Chevy Express 1 Ton Ext Duramax, EFILive. Edge Insight CTS.Throttle Down Kustoms Bumper.TCI Deep Pan. Fumoto valve. Diamond Eye 4" Turbo Back Exhaust BYE BYE Kitty and Ruffler. B&M Supercooler. AEM dry filter with custom air intake made by yours truly. PCV Re-Route. Diamond Eye turbo direct pipe. Kennedy lift pump. EGR valve and cooler delete. Trex-Tech Up pipes. Batmowheel. Turbo Performance Products turbo sock. Setrab fanpack fuel cooler. Jw Speaker headlights.



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Old 07-22-2019, 01:26 PM   #10 (permalink)
Mmcclos08
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Quote:
Originally Posted by ShopSpecialties View Post
GM brought the fuel cooler back for the L5P. Since fuel temps are read at the engine in the return line the differences could be possibly with the truck injectors returning more fuel. The factory fuel cooler is not very good and it is mounted in a poor spot. At the very minimum you want to keep fuel temps below 140*. Fuel temps below 140* will yield better performance, MPG, and keep the asphaltenes from dropping out the fuel and slowly plugging your fuel filter with tiny lil black specs.
This is great info. I wasn't sure if there was a target temp or not. I should have the drivetrain back in this weekend then will see what I am looking at space-wise and compare to the options presented here. I am going to put something back in, just not sure what. I found a reversible fan for under 50 bucks that I might try and mount to the factory cooler and see what that gets me temperature wise. I do plan to pull up to 10K lbs with this, so I am sure it would get pretty hot in the summer with a low tank. Plus the tank is smaller to begin with so there is less heat sink.

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