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Bosch vp44 injection pump schematic
Bosch vp44 injection pump schematic






During PSG failure, several different symptoms surface, with the most frequent being long cranking when attempting to restart a hot engine. Excessive heat and thousands of heat cycles take their toll on the lead-free soldering that was used in the PSG’s internal circuit board, periodically interrupting the electrical signal. The majority of VP44 failures can be traced back to the PSG, the computer that’s married to the top of the pump. The VP44 is capable of supporting 1600 bar (23,200 psi). A cam-driven, radial piston pump, it features three internal pumping plungers, a fuel metering solenoid, a timing advance solenoid and a built-in computer called a PSG (or EDC) that monitors and controls fueling. The ’98.5 5.9L ISB Cummins was equipped with the Bosch VP44 distributor style rotary injection pump. To meet ever-tightening emissions standards on pickup trucks, Cummins introduced both a 24-valve cylinder head and electronically variable injection timing midway through Dodge’s ’98 model year. It’s a company that has specialized in the ’98.5-’02 VP44 Cummins since it was introduced. Below, we’ll highlight the key causes of VP44 failure and what can be done to prevent it from happening.įor more light reading on diagnosis and functionality of the VP44 from a highly reputable source, visit Blue Chip Diesel. To be sure, the VP44 remains one of the ficklest components to ever grace the legendary Cummins lineage, but there is now an unofficial protocol to follow in order to keep one alive. With knowledgeable diesel mechanics, injection system experts and enthusiasts in that following, all of the VP44’s weaknesses have been exposed, well-documented and some have even fixed by the manufacturer over the years. Needless to say, the VP44 got a bad wrap from the get-go, effectively becoming the red-headed stepchild of the injection pump world.īut despite the VP44’s unpredictable nature and the fact that many prospective Cummins owners avoid them like the plague, it still enjoys a loyal following. It followed a period of time where the fully-mechanical Bosch P7100 aboard the 12-valve 5.9L offered in ’94-’98 Dodge Ram 25s wouldn’t die even if you were trying to kill it. This version of Cummins’ 359 ci inline-six, the 24-valve ISB, came equipped with the Bosch VP44 injection pump-an electronic rotary pump that is notorious for failing unexpectedly. The dead pedal, the long-crank hot restarts, the engine dying suddenly while driving down the road, never to restart again. How to Keep the VP44 in Your ’98.5-’02 Cummins Alive








Bosch vp44 injection pump schematic