I removed my liftpump yesterday because after changing the fuel filter it went out. I made some pics of the pump and stuff.<br>Lift pump pics<br>Now I do have a question: I noted that there is a checkball on the inlet side of the pump. In my opinion this checkball would bleed off pressure through the pump motor to the inlet.( therefore bypassing the pump ) Either my pump is somehow different, or I do have a brain fart .... <br>I thought about drilling a hole into the pump inlet and inserting a screw to hold the checkball down.<br>Any thoughts about it ???<br><br>AlpineRAM

 

Alpine,<br><br>This is indeed your lift pumps internal bypass. This checkball will allow bypass when outlet pressure exceeds 15 PSI, and has in about 75% of all cases, been the failure point on the factory lift pumps.<br><br>If you were to seal the checkball shut to prevent bypass, you'd need a regulator downstream of the pump to prevent an overpressure situation from occuring in the system. The overpressure may burn the lift pump out, pop a line, cause a banjo gasket to leak, etc etc etc. The VP44 can't bypass enough fuel to properly regulate the system.<br><br>Rod

 

I see that this should be a pressure relief valve in some way. on mine it is just the ball. No spring to press the ball down. This made me wonder. <br>How is this system supposed to look and how does it fail ?<br><br>I see that the VP44 is not intended to be bypassing this amount of fuel a pump with a blocked bypass would give. <br><br>Thanks for the info<br><br>AlpineRAM