Excessive case pressure being expelled after the throttle is lifted. With a VE you will get smoke, with a VP44 the truck often dies. The return side is too restricted, switched to an A1000 and bypass regulator, problem fixed.

 

It's my understanding the factory/OEM fuel return orifice is sized to work in conjunction with the case pressure regulator.

Are we talking about the resulting case pressure spike as the regulator backs off with side-stepping the throttle after a high RPM run?

Bobby, your incoming fuel pressure is regulated isn't it?

 

But, we are not talking about a factory or OEM quantity of fuel.

Yes. If you were to remove the KSB completely, use an open return fitting with the bypass regulator on the return side to control pressure, this would not be the case.

 

Got'cha.

(Folks still need to keep up with the throttle index though).

 

Read more: https://www.dieselbombers.com/newrep...#ixzz0Z2eDSPJF


Yep, I have a aftermarket pump with a bypass reguator, 15psi. Never watched the gauge when letting off to see if it jumps though.

 

Is that the spike that can kill the shut off solenoid?

 

I would think so Richie! Could be wrong though, I dont know the inside of these pumps like some of y'all.

 

I don't even know the outside , let alone the inside of these pumps.

 

I just keep playing with different parts and it has seemed to work somewhat good so far, I usually learn about it AFTER I mess it up and have to go back and fix what I did...

 

The only reason the vane pump is integrated into the VE or VP44 is for static timing alteration, lose the KSB and a lot of issues will follow suit.