Begle1

Now, somebody somewhere sometime was talking about threading an auxillary fuel input line into their fuel solenoid port.

Has anybody actually done this and have we decided whether or not it would work?

(You see, I'm designing a custom dash, and I figure that it would be cool to keep the stock piston pump for regular use and then maybe have an auxillary electric pump threaded into the solenoid port. But, if I did that, then I would need three fuel pressure gauges instead of only one, which would mean that I need to design a more complicated dash. So that's why I ask...)

wannadiesel

It would have to be a high pressure pump, that area can be as high as 150 psi.

Begle1

You're saying that fuel is being pushed out of the solenoid port at 150 PSI? How does that happen?

Now you got me really confused.

mhuppertz

Where did you tap yours Dave?

Underpsi

Im pretty sure he T'd off the inlet or just before the inlet going into the IP

gman07

The VE's vane pump takes the fuel from the lift pump and pressures it up to a higher pressure. This high pressure fuel enters the case, and is fed through a passage in the pump head, down to a port to enter the plunger area. The fuel shutoff solenoid simply blocks the passage to the plunger.

The VE will still require fuel for lubrication, so you'd have to leave the lift pump hooked up to the normal inlet. Other than that, it would probably work (with a pump capable of 150psi).

Begle1

I didn't know that; I figured the plunger would be on the other side. Why would they put the plunger after the vane; are they trying to make it wear out faster?


So the question now is, what starves first; does the lift pump starve the vane pump, or does the vane pump starve the injection pump? Would anything be gained by bypassing the vane and going straight to the injector-head-thing?

gman07

The lift pump generally starves the vane pump. At high RPM, a starving vane pump means lower case pressures, therefore, less advanced timing.

You have to keep fuel to the vane pump for lubrication. It'd probably work to use the shutoff solenoid port as a secondary feed though.