Quote:
Originally Posted by ol'George
The Grommet is 30 yrs old, they all crack/leak, it is expected.
while you have it out, take the tank off and flush it, you will be surprised @ the crud in it.
Premium gas is not needed nor recommended unless you have a modified engine with high compression.
If you choose to use non ethanol fuel, that is fine,although it costs quit a bit more.
10% ethanol is acceptable but no more than 10% by engine manufactures recommendations .
I don't like it, but I accept it.
Also,
If you think about it, premium fuel is usually not as fresh, because not a lot of people use it, so it sits in the fuel tanks of stations a long time.
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What he said.

You will be happy now to flush the tank seeing you allready have it off. Rather than later when you have it reinstalled, and the tractor starts running poorly.
I also don't think the fuel is your issue. Moreso the age of the tractor...