Curious about the cap, but having an issue. I do have four Takeuchi's, but only replace the cap if the rubber gasket is bad. The issue on the TB153fr is it started to stall. Sometimes at idle, but sometimes when operating. Machines runs great (1860 hours). So right up to when it stalls, no sputtering or any signs of problems. Power is good, engine is strong. Fuel is a couple of months old in it. I'm doing maintenance on all the machines right now. Just changed the oil and filter, fuel filter, cleaned out air filter, and cleaned water separator. Once stalled, turning the key again it does not always start right up. Give it some heat though, and it fires right up. It may run for quite awhile with no issue, or it may stall again within a few minutes. This just started, so still trying to see what is going on.