Hello I'm a contractor with many Grasshopper mowers this is my only Gas mower here is the problem just in the last 2 weeks the mower has been hard to start spins very easy acts like there is no fire or fuel but I hear the fuel pump running and I have taken out the spark plugs replaced them and did not really help the problem so I have replaced the in line fuel filter also I have looked at the air filter and the inner filter is black but not wet from fuel. I have been running the mower in 107 degree weather I don't shut the mower off because it acts like a vapor lock. I do not use cheap gas this is the first time since new I have had this type of problem Yes the mower is serviced as the owners manual requests Can anyone give some advice