FASS 2015-2016 Duramax 6.6L Titanium Signature Series - 100GPH Fuel Tank Fuel Air & Fuel and all other particulates down

and all other particulates down to 2 microns absolute

FASS Whisper Technology was in development and testing for over two and a half years to meet FASS Fuel System's high quality and durability standards

Then returning the fuel

the Bulkhead fittings function as both a suction and return tube

Optional Fuel Pressure Gauge Port

FASS 2015-2016 Duramax 6.6L Titanium Signature Series - 100GPH Fuel Tank Fuel Air & Fuel and all other particulates downFASS Fuel Systems Diesel Lift Pump 2015 2016 GM Duramax Lml 6. 6L Titanium Signature Series 100GPH (TS C12 100G). 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 CP4 injection pump to pull your fuel under a vacuum, adding additional stress to your CP4 Pump and risk introduce additional air into your fuel.