I installed a RACOR #14278 fuel heater between the tank and the FASS. I removed all the factory lines, filter housing, lift pump, etc. I had a local hydraulic shop make some stainless/teflon hoses to replace the factory lines from the tank to the injection pump.
Soon I will be installing a Transferflow 54 gal. replacement tank and will do away with the factory sending unit housing.
Bob