When is the last time you changed the glow plug? Also what kind of glow driver are you using? I'm not inclined to think that this is a problem with the pump setting, because fuel is getting to the engine, and you did not mention any other poor running characteristics other than being hard to start the first start of the day. It sounds like you may be flooded when you first try to start the engine. Do you leave the plane sitting in a condition that would allow fuel to run into the engine for an extended period of time? For instance, if you fill the tank after setting up and then the plane sits for a while, fuel might be slowly running into the engine. We had a good thread on starting procedures for the DZ engines in the pattern forum recently, check it out here: [link]http://www.rcuniverse.com/forum/m_7830399/tm.htm[/link]