Boat Gas Tank Not Venting

After so many years of use that plastic has to break down and get weak.
Boat gas tank not venting. They have to hold back vapor pressure until 5 5 psi. Captain aurora richard kittar. Open the manual vent valve if the tank does not have an automatic vent or a one way air check valve installed before you remove the cap to fill the tank. Taking a look on the outside of the hull and seeing if the vent is even there if it is corroded broken or upside down.
I run about 5 gallons of gas from a full tank and end up with a vacuum in the tank when i remove the gas cap. When installing a vent hose avoid sags aka traps anywhere in the vent. On one occasion my engine quit running as the pump could not overcome the vacuum. The fuel tank vent is located on the outside of the boat normally relatively close to the fill port on the gunwale of the boat.
Boat fuel tank vent tips 1. Many fuel vents have fine wire screens that keep out minute debris as well as. Close the manual vent after you have finished filling the tank. Clean the screen on your fuel vent.
Some boats will have explosion proof exhaust fans to vent the area prior to starting the engines and others will have will have proper ventilation built into the locker design. A boat fuel tank overflow can be caused by a clog in the vent. Open the vent after you connect the fuel hose and tank to your motor. Thanks for your question.
I m sure it has to do with the enviro system. No fuel tanks can be made with a free flowing vent. My gas tank is not venting this is not a filling problem it is not venting as it is taking gas from the tank. Don t trap fuel in your boat s vent line.
If in doubt take the tank off the boat to open the vent and make sure that there are no fuel fumes on the boat prior to starting the motor.