There is only one and a half or two inches between the fuel bowl/filter and the mechanical pump. I was worried that if I intercepted the flow before it reaches the high pressure side of the mechanical pump; A. The pressure would be reduced below specifications and B.The diaphragm pump might become damaged by the hotter and thicker oil. From the high pressure side fuel flows through a tee(banjo bolt) and into the rails. Almost set on the fuel bowl/mechanical pump deletion(I have most of the parts, though I am working on converting a Blue Bird Bus as well and could use the Bosch pump on that if a miracle of enlightenment made the bowl/mech pump deletion unnecessary)Please check out my poorly labeled thread(no mention of wvo), I don't want to hijack or post inappropriately.