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Hello my name is ***** ***** am I speaking with?
Just so I follow you. You have 15 gallons of new gas added to 30 gallons of 3 year old gas (for a total of 45 gallons) is that correct?
Where you would want to start here is by getting a portable tank, filling that up with fresh fuel, and running the negine off of that and see if the engine runs better. If it doesn't, step 2 is changing all of the fuel filters on the engine, including the one inside of the vapor tank. Does that make sense?
What is the serial number on the engine?
The next question was going to be if it was injected or not, and that is why I wanted the serial. The vapor tank is on the engine, it is where the high pressure pump, and high pressure fuel filter is located.
I actually have to run and go meet a customer on the water, I will be back in a few hours if you can wait. If you can't wait you can "re-list" the question and if anybody else is around they will pick it up.
Let me know what happens when you run it on the portable tank, and we can take it from there. Do you think you can do this later today?
93 would be fine, as long as it's fresh new gas 87 on up will work.