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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 10-15-2018, 02:33 PM   #11 (permalink)
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have you changed the ''FUEL FILTER'' or air filter yet?

2013 2500 ltz 4x4 d/a,, fully loaded ,white crew cab

Last edited by dmax3500; 10-15-2018 at 02:34 PM.
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Old 12-01-2018, 10:02 AM   #12 (permalink)
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Originally Posted by jp1gt View Post
take a look at the fuel rail pressure under load. In my experience a restricted fuel filter will just give you low power on a diesel.
In addition to the fuel filter did it cold also be the braided lines in yoru fuel system. Over time those hoses can degrade and collapse causing the symptoms you describe.

There are braided lines at the top of the tank to the 1/2" SS line, one under the drivers side of the truck between the frame and the transmission and yet another at the drivers side rear of the engine.

All could be the source of the problem.

I had that issue with the one at the rear of the engine. Since the fuel is under suction from the tank to the Fuel Pump you will not notice any fuel dripping, because the FP is sucking the fuel.

I did all the lines on my truck just in case.

I followed the TSB except for one procedure. The TSB called for the factory swaged clamps to be cut twice, 180 degrees from one another. I didn't see a way to fit my Dremel in there so I made one cut, in the easiest way, being careful NOT to nick the fuel line. It is essential to cut it entirely on one side.

Then I took a large flat screwdriver and slipped it into the slot I had created and turned it with a pair of Channel Locks. When I spread the slot the hose and factory crimp came off easily.

The lower one came off quickly, about 20 minutes total to complete it, including installing the new hose and two clamps on each end.

The upper one was more challenging. I removed the fender liner so I could sit on a work stool and comfortably work. I didn't even turn the Dremel on until I had the tool positioned correctly. There are many small wires near it and if I cut one it would have made another problem for me to repair.

I worked slowly and carefully to make that one cut. The upper end of the hose is a quick connect fitting (1/2") and it came off easily. It is necessary to push the fitting further onto the Steel line as you pull the tool into the disconnect. Do that and it falls apart. If you fail to push it onto the steel line you will fight it for hours.

Get a good grade of hose, make sure it is Bio Diesel compatible! I got mine online a while ago and had this piece left over from another project.

Douglas, Maurice, LA
2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS monitor on Windshield mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, MBRP Downpipe back 4" exhaust with muffler and FTE 30" resonator/muffler, Sinister EGR Delete, ATP Heavy Tow tune, Bushwacker Bed Rail Caps, AMP Research Bedstep, Futomo oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 5100NEC GPS/Stereo, Air Lift LoadLifter 5000 Air Bags, Bilstein 5100 Stock Height shocks.
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