My machine was giving trouble on inclines where it would run out of fuel even though the tank was full. I changed out the pick up tube in the tank where all is new including the elbow fitting that goes into the tank. Mine was steel they gave me a plastic one to replace it. It fight in tight and the dealer assembled the picj up tube and keepers so that was all ready to go. All I had to do was push the elbow in place secure the parts that makes it expand so it cant come loose and connect the hose going to the prime bulb. I cant get the machine to start so I pump the bulb it cranks up and runs fine. I can shut it down and leave off for a while and it will crank back up no issue. If I leave it sit up for several hours ..say 18 to 24 hours I will have to prime the bulb again before it will start and then once it is going then I can run it as much as I would like. Any ideas why I am losing prime?