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Old 29-11-2020, 11:04   #16
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

I believe Monel tanks were used in these boats.
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Old 29-11-2020, 11:10   #17
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

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Originally Posted by roland stockham View Post
Gas is an explosie fuel and produces vapour that is heavier than air which can collect in the bilges. If stored below deck it needs a gas tight compartment and all electronics must be spark proof. Think the same spec's as on a tanker. On a yacht this is almost impossible and cirtainly impractical. Also how will you get the fuel up on deck to fill the outboard? Almost all available pumps say 'do not use for gas' unless they are gas fuel pumps fitted in the tank that are so slow they would only be practical if you ran the tank as a remote with a permenant line to the outboard. Stick to cans on deck, much safer.
Wow, just wow.
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Old 29-11-2020, 11:34   #18
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

Gas and gas oil mixtures has a very limited shelflife particularly on a boat. I would expect trouble, i.e. clogged carb if you try to store for 2 months or longer.
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Old 29-11-2020, 11:53   #19
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

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Wow, just wow.


Is that a good wow?
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Old 29-11-2020, 11:57   #20
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

I am cruising so I run through fuel very quickly averaging 10 or more gallons per week. So though proper storage and filters will still be used I just want to clarify that some of the other concerns are not applicable to my particular situation.

As far as gas build up in response to robin the fuel tank on the alberg is situated in the cockpit lazerette which is a seal compartment to begin with but beyond that a vent hose is run out past the combing to stern.

I am planning on installing a bilge blower in any case because propane, fuel, noxious chemicals should be expelled anyway.
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Old 29-11-2020, 14:13   #21
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

I really donít think this is a great idea. I grew up with small gas engines in wood boats so Iíve seen it work out well and Iíve seen failures. Letís say...dramatic failures. Filters are nice but you might have a screen in the pickup tube. Get out when itís rough and it can get plugged. The tank might be fine but where fittings are attached, Iíve seen them fail. Seams fail from the inside. Iím old and I can tell you...old means you start springing leaks no matter how great you look on the outside. Same with tanks. Iíve seen some monel tanks last a very long time.
You have a classic risk reward decision. The downside with gasoline is bad.
Even if you change the delivery line, the fill and the vent and you get it pressure tested (which they do to all new tanks) and you put in a blower and a sniffer...you still have two problems. Condensation and fuel quality.
It would be OK if it was rum. I have a fuel injected 25 hp Yamaha on my dinghy and I can tell if the marine gas is two weeks old even stored in a 2&1/2 gal jug.
Filtering is not a magic solution. Neither are additives nor stabilizers. I just hope you donít do a lot of work for what might be an unsatisfactory result.
Happy trails to you.
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Old 29-11-2020, 14:37   #22
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

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Why? Do you smoke below decks in your boat?

Itís insanity on sooooo many levels to smoke in a boat.
Smoke..... gas / alcohol stove. A flame down below would scare the hell out of me. But what do I know...
Only have had diesels in every boat Iíve owned.

However assuming the set-up is safe, I would cut out the original metal tank and add a plastic tank in its place.

Good luck and be safe!
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Old 29-11-2020, 14:59   #23
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

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Why? Do you smoke below decks in your boat?

Itís insanity on sooooo many levels to smoke in a boat.
Chotu, u making me giggle. Yes, I hate smoking. But is there anything more insane than owning a boat?
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Old 29-11-2020, 15:08   #24
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

Since the old tank is in the lazerette... if tank in good shape... racor and fuel filters and stabilizer when sitting long periods. Absolutely need racors if going to outboard.

I sold my tohatsu 9.9 o/b to a fella sailor in San Carlos Mx. as he went south on his tri he clogged up over 10 times. Bad fuel. No racor set up on his boat. Lesson learned. Dirty fuel and no racor... stress out of your mind. Who needs that?
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Old 29-11-2020, 15:30   #25
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

Personally i would not countenance using petrol (gasoline) as main propulsion on a boat. I worry about my 2 gallons of dinghy outboard fuel. Having said that you might look at converting your petrol tank to Explosafe to reduce catastrophic risk.
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Old 29-11-2020, 15:42   #26
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

Check this out
EXPLOSAFE :: FAQ
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Old 29-11-2020, 17:04   #27
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

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Personally i would not countenance using petrol (gasoline) as main propulsion on a boat. I worry about my 2 gallons of dinghy outboard fuel. Having said that you might look at converting your petrol tank to Explosafe to reduce catastrophic risk.
You do realise that the boat originally was fitted with an inboard petrol engine and ran with it for years don't you?
I would suggest that using the original tank for its original purpose will continue to be just fine, provided the fuel line to the outboard is properly installed with appropriate filters.
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Old 29-11-2020, 18:01   #28
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

You'll be fine. If the tank is monel it will last forever.


There are brand new cabin cruisers with gasoline propulsion being sold to this day.


There are over 800,000 boats registered in Minnesota. Aside from the canoes, kayaks, and SUPs, nearly all of these use gasoline. There is one fire or explosion caused by gasoline every year or two, usually on boats in derelict condition or leaving shore with known fuel leaks.
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Old 29-11-2020, 18:58   #29
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Re: Utilizing old onboard fuel tank as storage for outboard fuel. (Opinion/suggestion

Looks like there is definitely a line in the sand. As I see it, the line has more to do with safety concerns than functionality of the system.

The input and warnings have been heard. Iíll do a final assessment of the components and work involved but as this was originally a gas engine boat I see no reason why routing the fuel to another location increases the risk any more than at its original manufacturing and design. Obviously safety standards have changed over the years but again I believe the individual, and vessel are as safe as the operator is responsible. I plan to be responsible in the installation. To be perfectly honest the current system of Jerry cans and refueling underway (spilled fuel on decks) is much less practical and safe than having a tank which was designed and built for the sole purpose of conveying fuel to an engine.
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