Thread: Boat fuel tank fill limit valve.

Originally Posted by No.3

Gummed up, strip out and clean. It's basically an air separator, trying to stop fuel blarting out the inlet and creating a danger when filling if I have the right valve. There's a doohickey in there that closes on liquid fuel hitting it, which allows the air to sod if while keeping the fuel in (hopefully).

When the valve stops playing it starts restricting air/vapour out of the tank as well which isn't helpful...

Thanks for your advice. I would be very surprised if it was gummed up as the boat is only a year old and has probably only been used a couple of a dozen times.

The hoses have low points in them and I did wonder if the low point on the vent hose might be full of liquid preventing it from venting, but the tank does fill to a point, it just shuts off too early.

I guess I could ask Profile for advice but with other issues I have found them to be quite dismissive.