Some one please help me. I am putting an aftermarket fuel pump in my truck that can put out up to 40psi. I no not enough fuel will hurt the injection pump, What about to much fuel? Will it all go back through the return line or do I need to put a fp regulator on it?

 

Welcome, 40psi is too much. Most guys like to keep around 15-20. you can only return a certain amount of fuel thru the return outlet on the VP-44. I read a thread on TDR several years ago where a guy put a flow meter in the return line and tried serval different lift pumps and several different pressures and got 30gph on every test except one with stock pump in stock location which was less then 30gph. What pump are you planning on using? If you use a regulator make sure it is a return style one and my choice of placement would be after fuel filter before injector pump, or put a tee on the injector pump and the regulator downstream of injector pump thus running all fuel past inlet at whatever pressure you desire.

Jed

Edit; that is for and 24 valve truck not 12valve, you might fill out signature so people know what your truck is.

 

Thanks for the welcome. The pump is an msd pump from summit. I guess you would call it a screw type maybe. I had thought about putting a holley on it but I run WVO and heard the vains in them dont sling out as much as they should in oil. I have a pressure regulator but I havent yet figured out how I want to tap into the return line for it.

 

Have not heard of anybody using that pump let us know how it works for you, everybody is on the search for the ultimate lift pump. I will put a walbro on mine when the stock one craps out.
Jed

 

I have not hooked up my fuel pressure gauge yet so I am scared to see what I am running. With what everyone has posted being so low, I am sure that with the veggie oil being thicker mine is even lower. But never know that stuff has a lot of lubricating potential.
Richard

 

40 is to much. II said anything over 21 is bad. You have to get a FP gauge hooked up before things get screwed up. I have a Walbro in my truck and a simple way to solve the high pressure problem is to put a tapped banjo on the vp input line and run a line between the banjo and a tee on the stock return line. I put a hose clamp on the line between the input and tee and tightened it until it was reading 17 idle 12 WOT.