I have a Ferris IS 1500 with the Kawasaki 19 HP engine. The engine starts fine, I can engage the blade and mow for about 5 minutes then the engine shuts off. I sent it to the local repair shop last fall. They replaced the fuel pick up in the tank, replaced the connection to the fuel tank, replaced the fuel hose and filter and sent it back. It ran fine for one lawn mowing then it was back to the same symptoms. It appears to run out of fuel. If you pull the choke up it will stay running for a few seconds longer. After leaving the mower set for a few minutes it will fire back up and run for another couple of minutes. Any ideas?