How big (litres) is the pod in the back? I assume you can/do bung it so it fills up completely. Just a little concerned about making it heavy in the bum. I see you already carry an Auxiliary too. 

Steve the tuna tube will need 1300 to1400 gallons per hour, I've got 1100 GPH and it keeps a skippie alive for just under 1 hour then it dies, bloody frustrating as I was hoping 1 tube would be sweet with 1100 as the next step in pump price is quite big.
I've tried a venturie system using 30 mm pipe under the hull and at 7 knots was no better.
Not shure what I'm going to do next season with the tube as I'm not 100% happy with it to be honest.
My pipe set up is identical to yours with funnel etc.

Pick up looks mint, good idea, wrap a bit of mesh around the pump pick up as fish scales get inside and block the impellor, kahawai scales seem to get into it even when you haven't caught a kahawai

Yes bubbles were a problem with my 1 st pick up, killed skippies in less than 10 minutes, good point re 90deg restricting flow, I've now lowered pump down under water line and force water into it with the under hull pickup, changed to a sealed specialist pump that has 32mm pipe inlet and 32mm outlet , real pain in the ass to be honest, skippies are bloody temperamental creatures.
Pick up placement is spot on, half way between side and keel strip opposite side from transducer .
Good idea piping outlet water away from pickup, another thing I underestimated was tube length, was bloody annoying having a big kahawai splashing water everywhere with its tail.
Be good to get out west this Sunday if your keen , give the tube a test before next season, still skippies around and maybe even a marlin

Kevin.S wrote: Why can't you mount the bilge pump in the bottom of the tube, with its outlet directed straight into the funnel, so there would be no bend at all?  Just thinking out loud so there could be a very good reason not to do this.  I think smooth pipe may give a better flow than that crinkly stuff as well.  Looking pretty good so far though, hope it keeps them alive.

Good point re smooth hose, generally guys are using 2800GPH pumps and running 2 tubes.these are $350 approx for the pump and a relatively large pump.
Bit hard to justify with 1 tube

I took Kevin's advice and mounted the pump inside the tube on its side pointing straight up. A spare piece of smooth 32mm PVC pipe pointing straight up with no bends or corrugation. 

:Hunter: wrote: Ive got an 1100 for my tube and I can keep a Skippy alive all day, I only use 150mm pipe though which I think helps of2fsh wrote: Steve the tuna tube will need 1300 to1400 gallons per hour, I've got 1100 GPH and it keeps a skippie alive for just under 1 hour then it dies, bloody frustrating as I was hoping 1 tube would be sweet with 1100 as the next step in pump price is quite big. I've tried a venturie system using 30 mm pipe under the hull and at 7 knots was no better. Not shure what I'm going to do next season with the tube as I'm not 100% happy with it to be honest. My pipe set up is identical to yours with funnel etc. Pick up looks mint, good idea, wrap a bit of mesh around the pump pick up as fish scales get inside and block the impellor, kahawai scales seem to get into it even when you haven't caught a kahawai

Yes it would help immensely , more flow past the fish, thanks for that idea I'll grab some 150mm from work and have a play

Your a genius! Just given me ideas to solve my tube problems! Thanks