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Very Leaky Gas Cap
My 07 521VX just developed a very leaky gas cap. When I take corners while trailering i can see a lot of gas spilling out. ALOT. I had a spare brand new cap and assuming it was the rubber O ring I just put the new cap on and it still leaks. What else could it be? I also tried switching caps with the one that is on my Port tank that I know does not leak and it still dumps so it must be the part that the cap screws in to. But I don’t see how or why that would start happening out of nowhere.
I am wondering if there is a one way baffle/valve in the filler tube or at the tank that may have gone haywire.
Last edited by Paintworx; 09-25-2021 at 06:38 PM.
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Are you sure the new cap has the O ring? If it’s a black ring,it can be hard to see. You might try another ring of the same diameter but a bigger wall thickness.
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Ya there is a large o ring on it. I even switched caps with the tank that doesn’t leak. It’s something other than the cap that is causing the problem because I have tied 3 caps on that tank and they all act the same. I am wondering if the hose that leads to the tank has somehow repositioned and has a low spot. Gonna pull the seat and take a look.
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It looks like I may have just over filled the starboard tank and the fuel is pushing back up the fill hose. All I can think is that it’s coming out of the air breather which vents outside of the Oring. 20199E73-1630-4CAA-912E-6F6FE0023397.jpeg
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You might be right,that’s plenty full.
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I siphoned some out and put it in my truck. I am not sure how it overfilled since I always use the same procedure. Wondering if the ground at the gas station was more sloped and let me fit more in there. Ez fix I guess but why can’t they figure out a way to vent the tank so the fuel cap can seal and I can fill the tank all way up. Maybe a one way flapper valve that will close is the fuel tries to go back up the hose.
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Thanks Again Mike. I promised I tried to search first. Must not have used the right words. I had finally figured out how to get the gas in without too much headache but I had never noticed the gas spewing out when taking sweeping right hand turns when towing. Maybe it has always been doing this (probably). I have the whole top cap of my boat wrapped with Paint Protection Film and this gas spillage has ruined it around the fillers and down the rub rail.
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With nothing but an open fill hose to the tank(s) and a small vent line the full to the neck fuel can/will spill out on turns. The addition of the Perko "anti-puke" flappers resolves this and allows for rapid fueling without having to do silly fuel island rituals to keep it from burping petrol all over you.
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