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SD-CAT-DMAX Sinister Diesel CAT Fuel Filter Adapter for Duramax

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SD-CAT-DMAX Sinister Diesel CAT Fuel Filter Adapter for Duramax

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The Sinister Diesel CAT Fuel Filter Adapter is meant to prolong injector life, but it also make routine filter changes faster and less of a mess.


Sinister Diesel CAT Fuel Filter adapters are a much needed innovation for the Chevy Duramax engine.

IF you own a Duramax and have spent any time researching them and their potential failures then you have read about the LB7 injector issues. Well, we work on a lot of Duramax trucks here at Lead Foot Diesel Performance and I will be the first to tell you that injector issues effect all Duramax engines, not just the LB7 trucks.

The problem is not the injector design, the problem lies within the design of the fuel system and the factory fuel filter rating. The stock fuel filter is only an 8 to 10 micron, but Bosch requires their common rail injectors to be filtered at 2 microns of filtration. So by running the factory GM fuel filters or even the absolute best aftermarket OEM style filter you are quite simply destroying your Duramax injectors.  LB7, LLY, LBZ, LMM or even a new LML it doesn’t matter; the factory filter is not keeping those injector damaging particles from passing through your injectors.

Installing the Sinister Diesel CAT Filter Adapter will give you exactly the filtration that Bosch requires for your injectors. I would however recommend installing an aftermarket fuel pump when using this product. A better fuel filter is obviously going to be more restrictive and if you didn’t know, the Chevy and GMC Duramax is the only diesel engine that doesn’t come with a stock low pressure fuel pump. Your fuel system operates off vacuum, which means the CP3 injection pump is not only having to pressurize and supply fuel to the two rails and 8 injectors. It is also having to pull its own fuel supply from the tank. So putting a 2 micron filter in place of an 8 micron filter is going to put a lot more stress on the CP3.  

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