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johnney

ys 400

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i have a 2011 hisun ys 400 starts and runs good for a while then all of a sudden while sitting the engine idles up and then stumbles and quits

HELP

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Welcome to the forum!

You'll need to narrow it down some. What are the other particular details leading up to it dying.

Are we dealing with a motor that is at operating temperature when it dies? Has it been sitting up, unused for a while? Or is it a semi daily driver, that's recently developed this issue? 

While we're working this problem, I'd try some easy stuff. Like pulling the gas cap while at idle, to let it breathe. See if it makes a difference. Listen for back pressure hiss when it breaks the seal.

Next would be to blow out the fuel lines. Both fuel in, and vapor return lines. Check the filter. 

 

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