water in fuel

[runamuck]

I have a 1998 21cc Seacraft & I am having trouble with fresh water getting in the fuel tank.I have checked all lines & fittings & they are OK. The fuel tank vent is attached to the fuel fill with a vented fuel cap.I think this set up is my problem. Looking for advice

[Mark]

A friend with a year 2000 20' Master Angler had the same problem. The cause of his was determined to be some rather creative routing of the fuel and vent lines: in rough conditions, he took a LOT of water into the fuel tank [img]/images/graemlins/shocked.gif[/img]

[ScottM]

runamuck,
Do you have a fuel/water separator? If not, it's a good idea to install one even if you still have to re-route the fuel and vent lines. This way you can be fairly certain that contaminated fuel won't get to the engine. Another way to prevent/detect water in your gas is to install a sending unit from WEMA , which will detect water before it gets from the tank to the water separator. Plus, you'll get a much more accurate reading on your fuel gauge.

[FELLOW-SHIP]

The fuel Vent line should have a U shape in the hose allowing water (if any water can get into it from the ocean) to be trapped in the U it kind of looks like this.
boat vent location ----- U ------ inside location of hose (the U should be located lower on this example)

This belly of the hose traps water in the U and keeps anything from intering into the tank.

FellowShip [img]/images/graemlins/grin.gif[/img]

[RS]

The fuel Vent line should have a U shape in the hose allowing water (if any water can get into it from the ocean) to be trapped

I'm pretty sure it's the opposite. The vent line needs a riser loop to prevent water from entering the tank. Accumulations of water in a trap will ultimately be sucked into the tank.