Running into HUGE issues with Kohler Mag 20 & 18 engines dumping fuel into bottom of the engine. To the point that I want to put a stick of dynamite under each of them!!
Replaced the fuel pump with a manual one on the 20hp Mag in the 982 last year after it crapped out while blowing snow, new one did the same thing about a week or two later. NICE!
Just picked up an 1872 with an 18hp Mag in it - did the same thing after running it for about 2 or three hours. Talked to local dealership about it, only connection between two was using Sea Foam as an atitive in my fuel. SO, I drained the tank completely, left it sit open for a few days to evaporate everything out of it. Engine oil was drained and sat with plug off for two weeks or more, so everything was out of it. Last week, put the new fuel pump on (manual type) and made sure it was fastened tightly against block. New fuel lines, fuel filter, plugs, plug wire ends, oil filter, and oil. Once I got fuel filter filled with gas and all the air out of lines, it fired right up. Ran perfect! I put a total of 1.5 hours on it afterwards - between idling (to check for leaks) and driving around the yard. Hooked the 450 blower up, ran tractor with it on - worked beautiful. What a beast. Kept an eye on the fuel gauge to confirm no gas was leaking into the bottom of engine (checked dip stick too, smelt it, fresh oil only) - perfect! Yesterday started working at moving the cab off the 982 over to the 1872. Everything worked great. Went out today to move the 1872 so I could use the 100 to move fire wood. 1872 wouldn't roll over? Thinking to myself that was odd, perhaps bad ground or starter dirty, or something? Scratched my head for a bit and noticed a drip from the front end as I was looking down. Hmmmm....
Well, removing the side panel - oh what fun again! - I notice the end of the muffler was wet about 3/4 of an inch up the end. Odd! Got looking and watching, oh yeah! Engine was FULL of fuel again and so was the muffler! Looked at the fuel gauge and almost 1/4 of a tank of fuel was gone.
So, needless to say after I was done cursing the tractor out. I drained the oil again and removed the muffler to drain it out. Thought what the heck, lets try rolling it over with plug wires off. Finally it did roll - SLOWLY - and it spit the fuel out the manifolds. So needless to say that engine is PERFECTLY clean inside now, from top to bottom! I'm sure there was a cup or more of gas that spit out from each cylinder. What a freak'n mess!
In fear of burning the darn thing - I closed the door and walked away.
What is causing the fuel pump to fail (I'm assuming that is what is crapping out all the time)?? I purposely bought new gas this time without adding any Sea Foam to it.
I also installed a new carb kit when I went over it the first time thinking the needle/float was messed up?
Am I the only person who has issues with these things dumping gas all the time? What the heck am I doing wrong? I now have an 1827, 982 and a 782 sitting in my shop - ALL have the same problem! Heck I check the white rag I put on the bench when I do carb work - I'm not leaving parts behind! I buy parts for it direct from Cub dealership for the engine. I'm at the end of my rope here with this problem.
Need some direction guys. Please.
