I've been struggling for the past few days. I was getting low pressure to my VP44 ([email protected]
, [email protected]
) so I replaced the lift pump. After that, the pressure fluctuated less, but the pressure was still low ([email protected]
). When I did the swap I eliminated most of the banjo bolts, so I'm pretty sure the problem doesn't reside with supply line restriction. I figured the problem might be with the Bosch Overflow Valve on the return side of the VP44. I've been looking into ways of modifying the stock valve (first pic attached), but the ball bearing that is retaining the spring assembly is too hard for me to drill through with the machining tools I have access to. I would have to roll the dice and buy a $50 carbide bit that *might* do the job. Unfortunately, no EDM machine in this shop. I also looked into just buying a fuel pressure regulator for the return line and eliminating the overflow valve, but diesel rated fpr's are two hundo at the cheapest for 15-20 psi adjustable capability.
So, this leaves me with my main question. Can I put one of the 12v overflow valves on (the ones that come apart) and modify the spring for my pressures? Or while I'm at it, would I be able to install the Tork Tek adjustable valves for the P7100 pump on my VP44 (http://www.torkteknology.com/product...-OFV020.html)?
I've read that the VP44 is rated for 15-20psi, and it looks like that Tork Tek is set to 30psi but is adjustable. Has anyone tried to turn one down to 20psi? Are the threads/sizing the same between the two injector pumps? Any info is greatly appreciated. I've been searching for an answer for the better part of a week now.