Hello.......again, A while back I posted a request for help with my McCullough chainsaw replacing fuel lines and primer bulb. So several responses directed me to the fuel filter, which had fallen into the tank and without it, apparently it won't run. I fished it out, soaked it and cleaned it and attached it and stuffed it back into the tank. An emergency took me away from it at that point so without really testing it, back on the shelf it went. Now it's firewood time and I brought it out and followed the usual routine and this time I was able to get it to start and run for about 3 to 5 seconds then it dies. It didn;t start like the instructions show you on the cover (supposed to start at 1/2 choke, throttle lock pushed down and when it warms up, place throttle to run and off you go) But all four times I was able to start it, it was not on any choke and fired right up....then died after a few seconds. I removed the cover and re screwed to carb down to see if there were any leaks while it ran and I saw none. Fuel lines and return line still connected (got fuel line set with 2 lines, one thin blue one and a thicker yellow one and have the thin one as my input from the tank into my primer bulb and the larger yellow one as the return line ) , and there seems to be no gas leaking, ANY help at this point is appreciated so I do not have to rent a saw for my wood, thanks very much!

I have a 20+ year old Toro Proline mower with a CH20 Kohler Command, and one of the head gaskets is bad. Around 800 hours on the machine, and I probably should just replace it one of these days, but it does such a good job that I keep dragging my feet. Anyway, I replaced one of the head gaskets about 7 years ago, but the gaskets are not too expensive, and most of the work of course is getting the shrouds, manifolds, etc. out of the way, so intend to do both of them this time around. I have a buddy who works part time at a local mower shop in his retirement years, and he said that I/we should at least lap the valves while it's apart. I will obviously inspect the cylinders at that time, along with wiring, hoses, etc. that are otherwise near impossible to get to, and just wondering if there are any other maybe less obvious components that I should be looking at.