I have a M18QS built in 1990, and installed on a 1991 Craftsman GT6000. I bought the mower used when it was a year old. Last year I started experiencing the "runs fine for 20 minutes, then dies" problem. I'm an average backyard mechanic, but this has me baffled - here are the details.
I've known for a while that the ignition modules on these were prone to issues. After inspecting the wires, and seeing that they were pretty well cracked and worn I decided to go ahead and replace the ignition module. While I was at it, I put a fresh oil filter and oil in it (easier to do with the shields off). It also has a new ignition switch less then a month old. It started right up, was idling smooth, took it out to mow, was running fine with power, and 20 minutes later it sputtered and quit. Again, acting like it was fuel starved. Started checking the fuel lines - no fuel between the filter and the fuel pump. Went and got new fuel line and a new fuel filter. When I removed the old fuel filter entirely, there was also no fuel between the tank and the filter. Drained and removed the fuel tank, removed the fuel pickup and found it full of crap. Fired up the air compressor and blew out the fuel pickup. Reassembled everything, jumped on and cranked the motor - watched the fuel filling up the new filter as I cranked (which implies the fuel pump is working - right?)...but...the engine wouldn't start. Sprayed a bit of carb cleaner in it which has served to help start it in the past and still nothing, not even a burp from the plugs igniting the carb cleaner. 30 amp fuse is good, but replaced it just to see if it made a difference - nope. Disconnected the kill wire to see if it made a difference - nope.
Anybody have any ideas for what I should try next?
I've known for a while that the ignition modules on these were prone to issues. After inspecting the wires, and seeing that they were pretty well cracked and worn I decided to go ahead and replace the ignition module. While I was at it, I put a fresh oil filter and oil in it (easier to do with the shields off). It also has a new ignition switch less then a month old. It started right up, was idling smooth, took it out to mow, was running fine with power, and 20 minutes later it sputtered and quit. Again, acting like it was fuel starved. Started checking the fuel lines - no fuel between the filter and the fuel pump. Went and got new fuel line and a new fuel filter. When I removed the old fuel filter entirely, there was also no fuel between the tank and the filter. Drained and removed the fuel tank, removed the fuel pickup and found it full of crap. Fired up the air compressor and blew out the fuel pickup. Reassembled everything, jumped on and cranked the motor - watched the fuel filling up the new filter as I cranked (which implies the fuel pump is working - right?)...but...the engine wouldn't start. Sprayed a bit of carb cleaner in it which has served to help start it in the past and still nothing, not even a burp from the plugs igniting the carb cleaner. 30 amp fuse is good, but replaced it just to see if it made a difference - nope. Disconnected the kill wire to see if it made a difference - nope.
Anybody have any ideas for what I should try next?
M18QS Problems
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