Cut the yard last week then put it away. Now it won't start. I tilted it up on the right side to look underneath it and then set it back down. It started but ran for five seconds with the choke pulled out. Now, it will do that every time if I tilt it up for a few seconds and set it back down. It just won't stay running. New gas, carb looks good, plug looks good, air filter good. Even the filter from the tank to the hose looks good.
Trash in the tank fuel line outlet. When you tilt it the trash moves and lets some gas in. Set it down and the trash goes back in the hole and shuts off the gas. No pressure to feed fuel so when you pull choke makes it run rich and then starves for gas again. Dump gas, disconnect the line at the carb. Put a clean tube (drinking straw, plastic tube, whatever will fit so you don't get gas in your mouth) in the gas line and blow air into the tank through the filter clearing the obstruction. Reconnect line then see if it runs longer before it shut off. If it does clean the tank and flush the dirt out.
If that doesn't change anything then it has to be a carb diaphragm leaking and it need a rebuild kit and fuel system flush.
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