Heres a tried and true method (our companies own experience) to prolong in tank fuel pumps life. We had a fleet of Workhorse chassis step vans. One in particular had a terrible record of faulty fuel pumps. Always at the same location. Even started to blame the driver for working with a local garage to split the cost of a new fuel pump and replacement. Finally figured out that this driver on a weekly basis would drive his van to the point of nearly empty so he could fill up at a buddys service station. Turns out the pump wouldn't get the cooling from the fuel in the tank and break down. Started insuring that all vans filled no less than a quarter tank and fuel pump problems went away.
