Could be small restrictions in fuel passages inside the carb, like cholesterol in the blood vessels. Sometimes a complete rebuild doesn't do any good, because you just can't get to everything.@Stumpy, out of curiosity, what would cause the fuel pump on the carburetor not to pump? I rebuilt the carb on my spare mower and the passages are clean. The diaphragms are new. If I dribble fuel into the carb it runs fine, but as soon as the fuel runs out it dies.
As you probably know gas turns to varnish over time, and will coat everything it comes in contact with. I've tore into carbs that sat so long, they were well past the varnish stage, and there was literal dust in the bowl, everything was super dry. Needless to say, that carb was unsalvagable.
Even just sitting over the winter can be problematic for summer equipment. How it's stored can make a big difference. Obviously inside a closed building is better than a tarp over it, outside.
Always a good idea to drain the fuel, but I'm too lazy for that, so usually use a fuel stabilizer. Even then I've had to pour in little gas into the carb of our mower, after sitting all winter, but is good the rest of the summer.
Different manufacturers call for different fluids. I've seen 20w-50 be used, to a very specific hydrostatic fluid.what type hydraulic fluid do these thing use in the diff? atf? regular tractor type hydraulic fluid? any idea ho much goes in? slow or sluggish reverse..... does this mean low fluid? I should be ashamed..... Ive never checked the fluid but I should have enough regular atf or hydraulic fluid to do a fluid change.
Al