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boatn

6 gallon portable gas tank

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Are 6 gallon metal portable tanks suppose to vent? After mine sit in the heat for a while the gas expands and spills/vents out the fill neck. The fill caps on mine seal tightly and if I open the caps slowly alot of air is expelled but I still get a spill. Am I suppose to leave the caps on loosely? Do the tanks need rebuilding and where do you buy a rebuild kit?

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Yes I remember as a kid using them they had a screw on the filler cap you would open

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Very old ones were pressurized, and did not vent. The line to the motor was a pair, with one side returning pressure to the tank. No one has made one like that in many years, though. All modern outboards (as far as I know) use a non-pressurized tank, which will have a vent screw in the cap. The hose shouldn't drip if the vent is left open.

If your tank does not have a vent screw in the cap it may be a pressurized type. The giveaway is the hose -- double hose = pressurized. With that kind of tank, it was sometimes necessary to leave the cap loose to avoid leakage.

Well, wait, now I think of it, at my East Coast place I do have a 1970's vintage outboard with a no old non-pressurized metal tank that has no vent screw. I don't use that motor much. The cap vents poorly if left on tight, and on very hot days I leave it loose to avoid the hose dripping. Maybe similar to what you have.

I doubt there is a rebuild kit for it, but a new plastic tank should work as a direct replacement no problem.

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Thanks for the responses. I need to look for new caps. The engine is a 1990 Yamaha 85 2 stroke aith a with a single hose. But both of my caps are sealed. If I can't find new caps I guess I need to buy new tanks.

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If they are Mercury or Yamaha brand tanks you might be able to get replacement lids. They were about $15 when I bought a couple several years back. I think I got the last two in New Hampshire because I went to 3 or 4 local places before I found them.

Good luck!

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