Hello to everyone as this is my first post! I own a 1990 743 with 2400 hours that I am having problems getting started.I have replaced the fuel filter (it appears to be sealed) and have replaced the rubber hand pump.About 5 years ago I replaced the pickup tube in the fuel tank and the hoses and hose clamps seem to be tight.Before I try to start I check the rubber hand pump and it is not firm,somewhere I am loosing pressure. When I engage the starter there is white exhaust and it takes a fair amount of time of priming the hand pump before the engine trys to fire.With work being as slow as it is I would like to try and get it going myself.Any imput would be appreciated! Thanks in advance Doug