Old Gasoline


Old 06-15-08, 09:32 AM
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Join Date: Sep 2005
Posts: 13
Old Gasoline

have about 1/4 tank (aprox 9.5 gallons) of old gas (regular unleaded) in my 38 gallons gas tank. This gas is about 10 months old and, due to ignorance, was not treated with a gas stabilizer previous the subsequent 10-month boat storage. The engine starts OK and was recently sea-tested for aproximately 15 minutes by a mechanic after an impeller repair.

What do you suggest my course of action should be:

A) drain/siphon the old gas
B) keep old gas and top off tank with premium gas
C) keep old gas and add an octane booster

The engine is an 06' 4.3L Carb Mercruiser 190hp.

Any comments and/or suggestions are greatly appreciated.
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Old 06-15-08, 12:52 PM
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Join Date: Nov 2007
Posts: 504
If you normally use regular gas, just fill the tank with that.

Other than that, drain it and use the old gas for the lawn mower mixed with fresh fuel.
Old 06-16-08, 08:48 AM
Join Date: Aug 2005
Posts: 2,268
Top off the tank with high octane fuel - then run it till it's almost empty before refilling --- you should encounter no issues.

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