I was loosing 2 to 3 mpg when my pinion seal was leaking and the rear end got low, also there is a bolt with a spring and a bering in the vp44 that cotrolls the inturnal pressur of the pump, and if it cant you will get the p216 also and losse the mpg this part is cheep and the cause of 30% or more of the vp44 that get replaced and people dont bother tooking at this.