Super C stalls after running 30 min.

A_Gauthier · Jun 26, 2010

The engine runs great, then after 30 min or so acts like it's running out of gas and stalls. If I wait until the engine cools it starts right up again and then stalls all over. It does this with or without the PTO engaged.

I have replaced the coil and plugs, cleaned the cap and rotor. There is sediment in the gas tank and carb, but gas is flowing. I cleaned the gas filter screens. Any ideas where to go from here?

erik dekeyser · Jun 26, 2010

Some times it will look like you have gas at the carb but if you let it run for a while it will slow down. The dirt collects at the top of the sedement bowl and slows down the gas or plugs it completly. Try and disconect the gas line at the carb and blow compresed air into it back to the tank. You might have to take the tank right of and clean it out. Also take the bowl of and take it apart and clean it good. Good luck,Erik..

Jeff Z. · Jun 26, 2010

Even if the bowl is full of gas it still may be plugged were it enters the bowl at the top of the sediment bowl assembly and gas from the tank can"t flow and push the gas through the bowl.

Many times a person thinks since the bowl is full there is no problem.

Even when you run out of gas the bowl is still full with a gravity system.

Harold Evans · Jun 26, 2010

This could be vapor lock, too. I agree with the others who have suggested a clogged gas line or filter, however I had these same symptoms on one of my tractors and discovered that its gas line was too close to the exhaust system near the engine. Take a good, close look at the entire gas line and see if it is close to something that gets real hot. If so, just reroute it and all will be well, no matter how hot the tractor becomes. Worked for me.

D7fever · Jun 26, 2010

check to see if the vent in your gas cap is open, if it is blocked, it will do what you described

Jeff Z. · Jun 26, 2010

d7Fever, Good point.
Air has to get in so the gas can get out.
Kinda like holding your finger over the end of a straw with water in it.
Nothing flows until you let air in.

ScottyHOMeY · Jun 26, 2010

The fuel issue is well worth checking out. If that doesn't fix it, it sounds a lot like a coil problem that's only going to get worse.

A_Gauthier · Jun 27, 2010

Jeff Z, thanks for the thoughts. I did unscrew the drain plug at the bottom of the carburator and gas was coming out ... so I assume that the gas is flowing. However, I think the whole fuel system could use a good cleaning one way or the other and it looks pretty straightforward to do ... even for a mechanics rookie like myself

Again, thanks for the advice.

A_Gauthier · Jun 27, 2010

Harold, thanks for the suggestion. That's an interesting fix. My father thinks I should replace the metal fuel line altogether and add a NAPA in-line fuel filter. After reading your post, I'm not sure if adding rubber and plastic parts right there is such a good plan. Any thoughts?

Super C stalls after running 30 min.

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