OMC Plastic fuel tank

[Newyota]

Have a OMC Durotank I think it's called from around 2000 that came with the boat I bought about 5 yrs ago and was wondering since I got it if these are supposed to build up pressure in them?The hoter out it is the more pressure.Thought these are vented somehow.I have been trying to read about them.thanks

 

[robert graham]

EPA requires ventless tanks now and they can and will build pressure and swell up some....pressure is capable of causing some gasket and O-ring seal leakage in the fuel system.....maybe best to crack open filler cap just enough to allow loss of pressure but don't tell the EPA boys I said so...

 

[GA_Boater]

The tank is vented, but it's a one-way vent when running the motor. EPA type tanks do swell and there is a over-pressure vent but the pressure pretty high. Cracking the cap is the only way to relieve the swelling.

 

[Newyota]

thanks..