I've had a few problems in the past and got advice to pull carb and make sure it was clean, jets clear, etc. I did that. Now here's my(& others)problem: I have to squeeze the bulb to gas tank until I see gas coming out of carb, and then it starts fairly easy. But, to keep it from dying I have to continuously squeeze the bulb, JUST BARELY, like I'm keeping time. As soon as I stop, the motor dies 5-6 seconds later. I'm sure I need to replace the diaphragm; it has small dry-rott area with small hole. I've also replaced fuel lines but see a small amount of gas leaking from the elbow on fuel pump side of hose feeding float bowl. I'm beginning to have more than average problems locating parts too (all "No longer available". Any advice on that as well?