After many years of observing and experimenting with the VP44 fuel system, we at Blue Chip Diesel are convinced that the operating environment of the vehicle and how additional horsepower is made inevitably determines the life expectancy of a VP44. That said, there are several factors that can help in increasing that life expectancy. 1. Temperature of the Pump The biggest factor in the success of a VP44 pump is that of temperature. Trucks that operate in hotter parts of the c