Looking to fit a new pump in my 6.0 mtr tinny. What size pump would be recommend for this size boat?

Can you have too big of a bilge pump?

I have a 6m tinny and I have a 1,000gph TMC 'heavy duty' bilge pump as the main pump.  It's on a blue sure bail float switch.

The 1,000gph seems to be a good size for general bilge pump work.  It will keep up with a 1 inch hole (e.g. bung left out ) comfortably.  My boat has a grid structure with limber holes so the pump is servicing the entire bilge.

Each outboard produces up to 12A charge and the pump draws 6A so that seemed an appropriate balance.  Also has a 28mm outlet, which allows much more water to be moved than the 19mm common on small pumps.

A frightened man with a bucket can shift more water than a pump.

MikeAqua wrote: Also has a 28mm outlet, which allows much more water to be moved than the 19mm common on small pumps.

Fraser Hocks wrote: 28mm over 19mm outlet pipe is a huge advantage and mounting the discharge point where its as low as possible, but wont take much slop back down it will ensure you minimize the impacts.

You can install it so the discharge pipe runs to high point and then down to a lower outlet. This reduces head, but increases surface friction due to the longer pipe.

Thats defnitly one of those comments you read, that sees your head turning rapidly from side to side, finished with a hand palm to the forehead.

 Well a few yrs back was messing/ using using a high volume bulge pump to establish required flow rate for a fish pond....
It was placed in an artificial stream....re circulating .. not too different to sitting in a bilge.....because it was sucking so much the water level dropped down to the point where it could not flow to the water holding area where the pump was fat enough. Was pumping a mixture air and water.

Very often there are drain holes and beams that restrict water flow to the pump in many bilges.. not to dissimilar to the artificial stream... and the bilge in our boat