Hobie1 I think you are building in unneccesary complication by adding a pusher pump to asystem which is perfectly capable of working 100% effectively without one. You have a Hilux with I would guess a VE type IP with an integral vane pump. This should lift fuel from a low mounted tank at the rear and you are only asking it to draw fuel from above tray level. If you are getting air problems then perhaps you need to find the air leak. Yeah not as easy as it sounds I know, Try putting your tank/cubie under a little bit of pressure with a hand pump or something (just 2 or 3 psi). The leak should then show itself. I used to use cubies as fuel tank and I know that they run out quicker than you like and then you get air in the line. I have a way of dealing with that simply. I have clear tops on my filter housings and a vacuum line connected with a clear line. I can lift the bonnet press a button and the air is gone.

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Johnnojack
4WD Isuzu Jackaroo 3.1 54,000km on WVO 2 tank home built system 6 solenoids. Mk. 8 version.