Mine ocassinly doesn't start after being warm, but it is less frequent now. I just turn the key to on for a couple of seconds then it always starts up. The reason I said start with the fuel filter is there is a pressure regulator bulit in to the fuel filter and it send fuel back to the tank if the gas can't pass though the filter, ie junk in you fuel or sedment that got moving around. If it doesn't start the first time I turn it off, then to the on position for 2-3 seconds and let the fuel system pressurize it's self again.
Dawsen