Bad Gas question?

[GLOCKMEISTER]

So I filled up my Bayliner runabout with bad gas. It runs fine and then every once in a while and I choke a little bit and sputter.
Its 50 gallon tank. The motor is at 150 mercury four stroke about a 2013 model. Question is is there an additive I can just add to the tank that will get the water or whatever it is out or do I need to completely drain the tank?

Maybe Quick Clean? Or Sea Foam?

[Buccaneer]

Sea Foam would be my first try.

[AlumRanger]

Methinks you're too late. Drain the tank, change the fuel filter, and clean the carb. Put in fresh fuel and treat with startron.

[WVBullet]

Drain it and install new fuel filter

[tav]

how in the world did you get bad gas? i guess you won't be going back to that station .

[Nightmare]

Perhaps you filled up right after a new load got dumped at the station and stirred up sediment. I'd start with checking and changing the filter. See what happens from there. Start with cheapest and simplest.

[Casslaw]

Start at the engine and work back. Take the filter off, if it’s plastic open it up and see what’s in there. Put some gas in a mason jar and see if water is in the gas or if there is sediment.

A Bayliner runabout probably has a water separator, how does it look?

Identify the cause before you go chasing your tail, just my .02

[billnorman1]

Start at the engine and work back. Take the filter off, if it’s plastic open it up and see what’s in there. Put some gas in a mason jar and see if water is in the gas or if there is sediment.

A Bayliner runabout probably has a water separator, how does it look?

Identify the cause before you go chasing your tail, just my .02

The jar test is important. If you have a good size water separator/filter it should trap some if not all contaminants. Is it ethanol fuel and how old is it?