Old gas in boat; To drain or not to drain

Need some advice.
I haven't been able to go fishing in ~18 months due to that 4 letter word "work".
I had filled up my tank with gas (~35 gal) prior to this prolonged storage. Fuel stabilizer (Yamaha) was added at that time.
I run two engines, one fuel injected (Yamaha F115) and one with carburetor (T8).
Since it has been quite awhile, and the fuel stabilizer states it is good for 6 months, will it harm my engines to run with "old gas", or should I drain and start fresh? I hate to waste $100, but engine repairs are more costly.
Thanks in advance for your advice.

I would bite the bullet and drain it. Use old gas in lawnmowers and the like. Get a bunch of fellas with gas cans to take help you out; its gona take a lot of cans...

I’m with Ice, drain it, better safe than sorry.


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Anyplace to pull a sample and take it to for evaluation?

As fragile as the combustion additives are, 18 months will definitely affect the performance of the fuel. If the gas had alcohol ,you might experience problems with the carb engine as plastic parts get very brittle. Bottom line is the gas has to be freshen up to have complete combustion. Pump half out and refill with adding a carb/injector cleaner. I kinda like seafoam product. Hope this helps.<*)}}}><

drain it dont use it in a lawn mower as it will be bad in it also.

I put stabil in a motorcycle and left it for 16 months while I was in the 'Stans. Once I got back home and spring came around it fired right up. It ran fine, until I put in a ditch.

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Originally Posted by Muttly

drain it dont use it in a lawn mower as it will be bad in it also.

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I figure if the mower runs, in my opinion, its all good. A lawnmower is easer to drain than a boat. Hate to see that much gas go to complete waste; How would you dispose of that much gas muttly?

All,
Many thanks for the advice.
I'll probably go with Chatt's middle of the road solution.

If anything id mix it 50/50 with fresh gas. Put the in your truck and it be fine either way. I leave gas in my duck-boat all year. And I t run fine with stabilizer in it


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I use 91 octane...when my boat sits for an extended period of time I will make sure I add fresh gas and that I have a 50/50 mixture. Then I put seafoam in it. Did it the other day and ran it all day at Melvern in the fog and it ran great. MY boat had sat for at least a year with old gas. Put fresh gas in it to bring it up to the 50/50 mixture.

You guys are great.
Where else can a person get decades combined experience from knowledgeable "boat guys".
Looked up Seafoam since several have mentioned it. Website says it can stabilize fuel for up to two years. Good for both fuel injected and carbureted engines.
Thanks again.

Quote:

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Originally Posted by Spine guy

All,
Many thanks for the advice.
Seafoam has served me for many years, its good stuff... I'll probably go with Chatt's middle of the road solution.

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I would throw in a can of Heat for good measure.

Star Tron additive will keep gas fresh,for 2 years. Can be bought at Walmart and some Automotive stores. I use it on my gas as well as Seafoam and never had a problem on my boat motors, chain saws, small motors, atv, or generator. All start great when they sit. I also use pure unleaded gas as well.