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Author Topic:   Gas Tanks
Bruce Boehle posted 07-09-2000 10:23 AM ET (US)   Profile for Bruce Boehle   Send Email to Bruce Boehle  
My Nauset came with two console located gas tanks. One Yamaha tank, one Johnson. Neither of them have a vent cap so consequently they both build up a ton of pressure when they cool down or heat up. The Johnson is bent in and bent out in other spots from pressure. They are also very difficult to open when under pressure. Can I buy replacement caps for these that have venting? Suggestions? Thanks Bruce
Dick E posted 07-09-2000 02:45 PM ET (US)     Profile for Dick E  Send Email to Dick E     
This is a bad situation.Tanks should be vented.
When you use fuel you will create a vacuum.That will be hard on your fuel pump and may cause your engine to run lean causing powerhead failure.

Try west marine or get NEW plastic tanks which have vents.West Marine have some on sale(6 gal)for $20.00

kingfish posted 07-09-2000 04:28 PM ET (US)     Profile for kingfish  Send Email to kingfish     
I concur - with no venting, you are almost certain to lose raw fuel into the bilge or onto the floor or somewhere under conditions of heat/expansion (bothersome and dangerous), given that the pressure that develops will certainly, sooner or later, find the point(s) of least resistance and cause a leak; on the other side or the coin, if your system really isn't vented, I'm surprised you haven't already suffered from the engine stalling out when it starves from fuel in a vacuum condition.

Rx - new tanks will certainly solve the problem, but I'll bet those tanks originally came with vented caps, and I'll also bet that replacement vented caps are available.

whalernut posted 07-09-2000 07:43 PM ET (US)     Profile for whalernut  Send Email to whalernut     
Bruce, I can relate to what the fellows are saying about venting. I have a 73` `16 Cirrituck with 2 6gallon metal OMC cans for the 85h.p. Johnson. It seems to run o.k. at high speed, but when it is just in gear speed, it will stall in about a minute. The tanks are non-vented. I also would like to buy vented caps for my tanks. I have seen them before for sale, but that was a few years ago, when metal cans were still fairly popular, as they are like $80.00 now and most people buy plastic. So if anyone can help with metal OMC vented can caps please help. I am going to put an 18Gal. Tempo plastic gas can under my bench seat and run the 2 metal 6 gallon cans as back-up and long distance fishing. Can someone help us? Regards-Jack Graner. P.S. can we turn the can caps the half turn to vent them as they still can`t come offf of the can? The only problem is the fuel leaking out when the cans are kind of full.
Bruce Boehle posted 07-09-2000 09:59 PM ET (US)     Profile for Bruce Boehle  Send Email to Bruce Boehle     
I will try to find a replacement cap and let you know. In the meantime I am leaving my caps loose so they can vent. I would like to leave buying new tank/tanks for next year since I plan on rebuilding the console and may opt for a different size tank. I have looked at the option of putting one under the seat but that's where my lunch goes! Does any manufacturer make a tank that would horseshoe around the tunnel thus maximizing the capacity the console area would hold? That would be ideal.
Thanks, Bruce
triblet posted 07-10-2000 02:51 AM ET (US)     Profile for triblet  Send Email to triblet     
Did you try a Yamaha or OMC dealer for the
caps? Also, West Marine carries a vented
cap for the Tempo tanks that might work.

Chuck Tribolet

lhg posted 07-10-2000 01:06 PM ET (US)     Profile for lhg    
Bruce: The mahogany consoles were specifically designed for two 12 gallon tanks (with vented caps!), which Boston Whaler had Tempo design for the boat. They were originally available in red painted steel, and then were brought out in red plastic. They fit perfectly under the console, held in place by the wood bar, and I used these for years. Tempo's model # was PBW-12, but recently they improved the tank and called it ULTRA-PBW-12, increasing the fuel capacity to 13 gallons. They cost $40 at Bass Pro (withdrawl fitting about $5 extra), although I'm not sure the new, larger one fits! These tanks have also been standard fare on the Montauk for years. I would make this upgrade instead of replacing the old 6 gallon tanks.
Bruce Boehle posted 07-10-2000 02:48 PM ET (US)     Profile for Bruce Boehle  Send Email to Bruce Boehle     
Thanks for the input. I have located the UltraPBW for $37.88 at Hern and will go that route. I will have to add about 1.1/2" to the bottom of the console to fit them under the shelf though. Off to the lumber yard for more mahogany I go.
Thanks, Bruce

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