If you have just invested in a Cummins VP44, you need to know what to do make sure that it functions well and serves you for as long as possible. This injection pump is crucial for proper delivery of fuel to the engine of your vehicle. For your vehicle’s engine to operate properly, it needs spark, fuel as well as compression. There are two main types of pumps in vehicles, namely mechanical and electrical fuel pumps. Most of the vehicles these days come with electrical fuel pumps.