Because your Duramax factory fuel filter is located after our filtration system you will still need to replace the factory filter every 5,000-8,000 miles. Once you’ve installed an aftermarket Fuel Filtration System such as our FASS Titanium Series, the use of the factory fuel filter is no longer required and can be removed. The Titanium Signature Series diesel fuel lift pump was engineered by FASS Fuel Systems to be the top performing, longest lasting and most reliable aftermarket filtration system in the diesel industry. This is where a Titanium FASS Fuel Pump comes in to help. This requires your CP3 injection pump to pull your fuel under a vacuum, adding additional stress to your CP3 Pump and risk introduce additional air into your fuel. A FASS Fuel Systems can be a beneficial upgrade for your GM Duramax 6.6L diesel engine, this is because your Duramax doesn’t come with a factory lift pump like other diesels.
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