Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: Leaking low permeation fuel tank
Posted by Salsa on 12/22/17 - 6:03 AM
#1
1967 Nauset with 50 hp Yamaha 4-stroke
After two years of very light use, the 12 gallon low profile/low permeation fuel tank began leaking. Gas odor had become steadily more noticeable and when checking the tank discovered paint beneath the tank was discolored and moist with fuel. Tank had never had more than 10 gallons in it and that amount following fueling at the beginning of each use. (West Marine catalog states that this tank has 13 gallon max capacity.) When returned to dry-stack, fuel in tank was always well below 10 gallons. Fuel connection and fuel line were intact and not comprised. Obviously a seam leak in the tank. Note that this tank expands when exposed to warmth of the sun, therefore there is a build-up of pressure. Removed the tank, emptied the contents into storage for use in farm implements. Discarded the empty tank.
Posted by butchdavis on 12/22/17 - 7:42 AM
#2
The tanks are designed to vent when internal pressure exceeds a certain level. Depending on the storage attitude of your boat a small amount of fuel
could have escaped through the tank vent and run down beneath the tank causing paint damage.
If a tank seam failed it is a dangerous tank fault. It would be a pretty good idea to notify the USCG and West Marine about the failure.
Posted by Phil T on 12/22/17 - 8:03 AM
#3
Would really help to know the Brand and Model # of the tank.
The EPA compliant vent/caps open at 3 psi. I had a portable Moller 6 gallon that spewed gas all the time. Ditched the cap. Problem solved.
What was obvious about it being the seam?
Posted by Salsa on 12/22/17 - 9:35 AM
#4
I should have mentioned that one of the first items I checked was the cap. I detected no leak around the cap. That cap, by the way, screws in several turns for an extraordinarily tight seal. As has been pointed out, that tank system works because of pressure. There was no evidence of any escaped fuel on top of the tank.
Local store was advised of the tank failure, as well as the catalog website.
By the way, I usually have good experiences with West Marine products. This is the first WM product problem I have had over years of ownership of sailboats, trawlers, and now, an outboard.