I have ordered a gmc 3500 d/a and this truck will be used exclusively for towing travel trailers, 5th wheels, etc. I will putting between 70 and 90,000 miles per year on this truck. I'm going to install a nicktane pre-filter, dual remote oil filter. after market exhaust, and intake inlet and filter with stock electronics. My question is do I need to install a lift pump? Thanks for any replies. Soon to be retired, Saxman. Edited by: saxman