This is normally due to either a clogged intake filter, or water in the fuel. To rinse the intake filter and the tank, put in a quart of fuel and shake, shake, shake to rinse crud off filter and dump out. Otherwise you'll have to disassemble to get to the filter. To remove water from fuel, dump it into a bucket. The water will coalesce in the bottom, then pour slowly back into the tank, leaving the 'bubble' of water in the bucket.
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This is normally due to either a clogged intake filter, or water in the fuel. To rinse the intake filter and the tank, put in a quart of fuel and shake, shake, shake to rinse crud off filter and dump out. Otherwise you'll have to disassemble to get to the filter. To remove water from fuel, dump it into a bucket. The water will coalesce in the bottom, then pour slowly back into the tank, leaving the 'bubble' of water in the bucket.