I love hearing "PAPA"
This is an idea I got from Black Magic. May have already been tried out.
This pump uses two pump heads, one is for the main car hydros and the other is for the piston inside of the tank.
As the switch is hit for up, fluid flow from the AUX. pump head flows to the cylinder inside of the tank, forcing the piston to compress the fluid in the tank, which, forcing the fluid into the MAIN pump pickup.
The plumbing of the AUX pump is on the outside of the block, but some can be run into the block.
The black heavy lines under the pump heads are fluid pick ups.
Any comments, suggestions? I see the return from the cylinder will need to be worked out. I could use a dump, again this could be plumbed inside of the block using a second internal dump.