Hydra Mac model 10

I have a hydra mac 10 and I am looking to add a secondary reservoir behind the operator so I will have positive pressure on the intake side of the pumps to avoid the starvation issue. I know that they did this with the next model (12) to fix that issue but I don't know how to set it up exactly. Anyone have any insight?

Diesel or petrol?
Either model should have a fuel pump of some sort, so it really shouldn't need the gravity feed to keep it going. I wonder if you could add a small inline fuel pump.