Did you install a screen before the electric pump or just trust the in-tank screen?

The bellows type pump sounds promising for pumping oil, an impeller pump seems like it would tend to cavitate. I guess I just need to pump some oil with it to test it before I install it. duh

New veg oil is more expensive than diesel, but used veg oil is free, at least for now.

I read somewhere that there is a bypass valve in the injector pump that returns fuel to the tank at about 12psi(?). I am thinking that something approaching that number would be perfect for the boost pump. But if you are saying that you get a 5-10psi drop from the tank to the lift pump, I think it would be enough of a margin for any conventional pump.