The Perko vent shown is however, designed to comply with the current EPA standard for fuel systems. Snowbirder didn't say how old his boat is but if the fuel system was installed before 2010 then he can have a fuel tank vent that vents directly to the atmosphere and does not have to have the flowback feature Nevertheless, the info provided by Gonzo as to the new regulations will be valuable to new boat builders and DIYers as well Non compliantĪnother reason that the tank must be vented is a potential vacuum that might occur from the fuel pump drawing the fuel into the fuel pumpįurther in the tech info, they discuss the air moving in and out of the canister to keep the canister carbon "clean" With the filling vent open to atmosphere, this would not happen. If air is getting to atmosphere, then it is vented to atmosphere. ![]() I would screw the cap on the filler, cover the 1 1/2 inch hole with your hand and blow on the vent. If this is a filler that meets the requirements, with the canister as shown in the drawing, this vent cannot be open to atmosphere when the filler cap is closed When you look at the Perkos drawing with the integrated FUEL FILLING VENT, this is also what it shows. ![]() It appears that this vent is to assist in filling, ie fuel volume in, vapor out WHEN filling. ![]() Ie they say that this is a sealed fill and when the cap is closed, and sealed, this forces the fuel vapor through the carbon canister that is a new requirement. Click to expand.If you read the Perko info that Gonzo presented, it appears that the fill in question is not vented to atmosphere when the cap is closed.
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