I have a related problem with a Yamaha 200 four stroke. It doesn't starve for gas unless it sits for an hour or so while I'm fishing. It runs fine at high speeds, but during a start up and mild idle the bulb will collapse. I pump the bulb, and it runs just fine. We put in a new fuel line... Same problem. We even took the hose off the bulb, attached a clear hose to the engine side of the bulb, and watched the fuel run back into the tank. Maybe just an anti-siphon valve? Any ideas?
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 My Father circa 1985 holding a grouper and red snapper behind his 27' Scotticraft, Seaducer, with twin mercruisers - a member of the Bucket-Bow Boats.
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