FASS 2011-2014 Duramax 6.6L Titanium Signature Series - 165GPH Fuel Filter Fuel Air & Fuel this adjustable fuel pump is

this adjustable fuel pump is rated at 240 gallons of diesel fuel per hour and offers adjustable fuel pressure from 1-55 PSI to customize fuel delivery for race or competition diesel engines

this is because your Duramax doesn't come with a factory lift pump like other diesels

7L Cummins diesel engine with enough fuel for multiple fueling upgrades

4L Titanium Signature Series 250Gph (TS F16 250G)

FASS 2011-2014 Duramax 6.6L Titanium Signature Series - 165GPH Fuel Filter Fuel Air & Fuel this adjustable fuel pump isFASS Fuel Systems Diesel Lift Pump 2011 2014 GM Duramax Lml 6. 6L Titanium Signature Series 165Gph (TS C11 165G). A FASS Fuel Systems can be a beneficial upgrade for your GM Duramax LML diesel engine, this is because your Duramax doesn't come with a factory lift pump like other diesels. 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.