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What we have done on bikes...
First drain all the old fuel out & remove petcock and fuel cap.
We then used water, yes water to get any larger particles out as its the cheapest liquid to use. We even used a pressure washer to get anything stuck as some rust get stuck to the walls or its old fuel as they can both look the same, pressure washer works very well or go to your car wash place and do a couple of washes.
Used compressed air to dry tank and let it sit outside.
Recheck the tank or shake it to see if anything is still in there, if then repeat.
Check you petcock also and clean it on both settings, on & reserve.
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