Question about 2003 GMC Sierra 2500HD

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Is there a sending unit in the tank for a 2003 gmc 6.6 duramax diesal

Please refer to the above

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Yes the float mechanism is like the toilet tank set up but uses wires on a printed circuit board to measure the level tank removal is required to service the float assembly.

Posted on Apr 17, 2014

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2006 gmc 2500 hd sieara duramax diesal,reduced engine power light came on, what is the problem??


Unhook battery wait a few minuites reconnect battery should reset computer codes to allow you to get it to a repair shop.

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1 Answer

How do you change the fuel sending unit on a 2003 duramax diesel


2 ways this can be done 1 lift the bed of the truck offso you can get to the top of the tank where the sender is located ( 8 bolts 4 on each side, three 9/32 screw aound filler neck and 1 or 2 plugs for tail lamps. Th other option is to drop the tank down by removing filler neck hose from tank and 2 straps held in with 15 mm bolts , It would also be helpful if the tank is as empty as possible...good luck

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Is the fuel sending unit duramax in the tank


where else did they ever put one on any vehicle? even a sightglass would have to be on it to work

Apr 17, 2014 | 2003 GMC Sierra

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Will a transmission from 2003 duramax fit in a 2004 duramax?


They will deefinitely providing the 2 are the same model. In 2004 the Allison tranny was available in a 5 or a 6 speed. Before 2004 only the 5 speed was used. If one is changed for the other there will be shifting issues and codes set in both the ECM (engine control computer) and TCM (transmission control computer). Make sure you are putting in a 5 speed Allison tranny.

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2002 chevy silverado 3500 crew cab duramax will not start


sounds like a fuel pump/sending unit.. a pump normally just quits with no warning..

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1 Answer

Excessive black exhaust on 2003 GMC Sierra Duramax Diesel.


This is what i would try (cheapest first) redexe/wyyns
injector cleaner,double dose,then i have put 1gal gas in 10gal diesel to increase burn temp (you may encounter a hot start problem temporarilly)then if still smoking, get a compresion check on the engine(this will tell you volumes)
by the way the NATO tanks put in 1/3 gas in diesel to stop it freezing in arctic conditions.any more than 1/3 can result in problems.

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Problem with Diesel Fuel System. Gmc 2002 duramax 2500 HD 4x4 will start 

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1 Answer

Auto repair


My jeep when empty still has 6 gallons approx left with the light on, i assume the sending unit took a ****, or the float is messed up. As the 2 people above i would say the method to fix your problems is having the sending unit replaced. Which means taking the fuel tank down and replacing the sending unit which housed the fuel pump and the float/line. Not cheap.

Jun 19, 2008 | 2003 Jeep Liberty

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