mate its not the tanks, its condensation getting in there, the idea is to fill the tank to capacity after each use, try some meths in the tank, it helps evaporate the water, I run 3 fuel filters just for this reason, sounds to me as if your going to have to drain the water off but do it through the fuel line as you must have more water than fuel for it to cut out after 5mins

Best approach is drain the lot till the tank is dry and start again, if you have that much in there then you have more than a condensation problem...

The volume of water that After Dark is talking about finding in his tank would, I reckon, be too much for condensation. You do get some condensation in a tank, but enough to fill a filter and clog it - sounds to me like a water leak.

You need to thoroughly check the filling system, O-rings, seals, and whatever else, to make sure it's totally secure. Also the breather or could the water be sitting on top of the tank and leaking through the fuel gauge sender (if you have one). Is it running back down the fuel hose and getting in somewhere there - check every way into the tank.

I've got a half full 180 litre alloy tank in mine and it's just sat through this cold winter with no condensation at all.

Titahi wrote: RB I think your mate got screwed... Without the pleasure of sex! The $5500 works out at $1800 dollars to replace each injector?, I,ve got some new ones, $800 each plus fitting, but not $1000 to install two bolts, clip in the wiring loom and tune with the computer! Get him to ask for a break down, or go disgruntled former postal Given that the problems these injectors experience with small amounts of water intrusion, I wonder if BRP will include a small water separating filter online on future models? Or continue to loose customers and goodwill?

He showed me a copy of of the receipt, cant remember what was what but all $5,500 was accounted for! Same place just charged him $2000 to service his 75 R-tec, changd the seal on the gear box behind the prop, new steering cable and helm "because the steering was a bit stiff".

Water in fuel. Had the same problem with my diesel. here is my check list.
1) Condensation in tank - fit tank drain hose and a valve at lowest point of tank. Regularly drain the dregs in the bottom of tank. 
2) Check the o- ring on the fuel filler cap. Replace regularly if filler cap is outside. Move filler point under cover.
3) Check if water can sit on breather, cover breather so it is always dry.(this was my problem).
4) Change hoses if they look suspect. Dagwood's experience is good news for this process. Synthetic hoses do fail with time even when covered up fro UV light. they do not last forever.
5) drain fuel filters as part of the pre trip inspection
6) Do not refuel in the rain!

The secret is to keep checking and check again.  My experience is water caused my fuel pump to  fail and I returned to Port at 4 knots. Cost about $1500 to overhaul and retune, included haul out as a marina berth was not available. Never want that to happen again.
Water in the fuel is a no go area with me.