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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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Old 09-10-2002, 12:01 PM
cabdoors cabdoors is offline
Join Date: Sep 2002
Location: Iowa
Posts: 2

Do the 2003's 6600 have a fuel cooler?
I am brand new to this and am thinking about a new Duramax. I read somewhere that there is a fuel cooler but I don't remember which model year.
This is my first post.
Old 09-10-2002, 12:42 PM
BLUMAX BLUMAX is offline
Join Date: Mar 2002
Location: Portland, Oregon
Posts: 44

First off welcome "cabdoors" I'm sure others will chime in on this but the only fuel cooler I know of is a little raditor looking thing in front of the fuel tank. Kneel down on the drivers side, front edge of the box and you'll see the tank with the cooler in front of it. Second, quit thinkin' and go get it!! You'll be in love from the first drive and develope that famous "DMAX Grin". After 7 months and 10,000 miles I'm still impressed. You'll get lots of geat info from our fellow members, so enjoy the site, and go buy that truck
'02 2500HD, LS, Ext Cab, LB, D/A combo, 4x4, Indigo Blue (the good lookin' blue), Graphite Interior/Buckets, just about every option but leather
Old 09-10-2002, 09:23 PM
Merconvert Merconvert is offline
Join Date: Jul 2002
Location: Hemet Ca - Southern Ca.
Posts: 23

Hey Guys, if you run dirt or dusty Roads,blow the Fuel Cooler out now and then . Makes for better running.

2001 Dmax crew 3500 stock.
Old 09-11-2002, 01:30 PM
deerhunter7 deerhunter7 is offline
Join Date: May 2002
Location: Rogers Mn
Posts: 136

Merconvert Thanks for the pointer. One more thing to remember to check...
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Old 09-11-2002, 02:12 PM
Allison Jettester Allison Jettester is offline
Join Date: Dec 2001
Location: Lexington Park, Md
Posts: 137

Welcome to the forum, Cabdoors. I do believe that the cooler in front of the tank is an engine oil cooler. It is mounted there to warm the diesel. Diesel doesn't like cold.


[ 09-11-2002: Message edited by: Allison Jettester ]</p>
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Old 09-11-2002, 02:22 PM
DMAX Daddy DMAX Daddy is offline
Join Date: May 2002
Location: Oxnard, CA
Posts: 338

My 2003 has the little radiator in front of the fuel tank, so yes to 2003 Fuel Coolers [img]smile.gif[/img]
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Old 09-11-2002, 04:53 PM
2K2AD 2K2AD is offline
Join Date: Jan 2002
Location: Virginia Beach, VA
Posts: 109

I was under the impression the little radiator in front of the fuel tank was the injector computer. The fuel runs through it to cool it and the fins help dissapate heat the old fashioned way. My 2K2 has this assembly, maybe what you guys are referring to is in addition to it.

2K2 EC/SB K2500 D/A<br />Other than the TS123, Dakota Digital Boost and EGT gauges and the H2 Wheels with 33x12.50 R17s - Bone Stock
Old 09-11-2002, 08:05 PM
Posts: n/a

Nope, the injection computer is up on the engine and fuel is run around it there to remove heat. The return fuel then goes back down along the DS frame rail and up through that fuel cooler "radiator" before going back to the the tank. That's one reason for the admonition about running the tank too low. All the return heat from the ECM isn't mixed with enough cooler fuel in the tank and the fuel going forward is getting hotter and may not cool the ECM enough. When I plumbed in my aux tank, it came with a quick-connect tool to snap into that fuel cooler so that returning fuel goes through the cooler and then to the "in service" tank (OEM or aux). As one who spent a bit of time up under there futzing around with the plumbing, I can tell you that it is just a tube & fin cooler. And it's not oil, Jettster, it's fuel - and the return flow of warm fuel *and* the heat added to it by the ECM take care of that "cold diesel syndrome" you're referring to.

[ 09-11-2002: Message edited by: Idle_Chatter ]</p>
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