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replace fuel filter. check spark plug. fuel has waste in it bad fuel maybe.. has it been setting a long time. remove sediment bowl from carb. should at least drain the carb and catch the fuel from the drain. examine fuel caught for bubbles in bottom of fuel container. air filter clean? adj timing ? does it smoke when running? backfire? choke off ?
It appears that you have fuel venting problem or a float level set too high. Check the entire fuel system for kinked / blocked fuel lines/ filters and check the float level or fuel manifold pressure if it has one.
you probably dont have a fuel pump issue, atv's after sitting have a problem of not starting due to carb gumming up. if its fuel injected, then i would say poss fuel pump but if not, the carb gummed is more than likey the issue.
If your atv has been sitting this long, the carb is probably stopped up internally... take the carb to a qualified professional and have it cleaned and set...(take a few pictures so you know where all the hoses re-attach)
ALL it takes for an engine to run is:
1. A timed spark
2. Adequate compression
3. Proper fuel/air ratio delivered