One of the most common failures of the VP44 injection pump is the cracking of the stainless steel diaphragm (pictured on the far left) which in turn causes premature & excessive wear on the advance piston. Lack of fuel pressure to the injection pump is the reason for this. The internal supply pump (the item on the far right of the picture) inside the injection pump creates an enormous vacuum which causes the diaphragm to flex, crack & break. Another main failure of the VP44 injection pump is the advance piston (middle item pictured). The piston becomes scored (light colored marks at top & bottom) & sticks in the pump housing which usually sets a P0216 timing advance failure code. This failure can also be contributed to lack of fuel pressure being supplied to the injection pump. In other words, keep your VP44 pump supplied with fuel pressure!!!!!!
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