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If the bulb is collapsing you are:
A) pulling a vacuum on the tank as the vent is clogged, this could be temporary cured if you open the fuel fill and allow air inside. (be careful no water gets in there)
B) as mention, your pick-up is clogged with tank corrosion stuff. If you have a fiberglass tank and an older boat, this is most likely your problem. This could become a chronic problem. If so, take off the screen on the pick up, and put a pair of RACORs on board with a lever switch so you can change the filter on the fly and change the cartridges several times a season. (then consider selling the boat or changing the tank to AL)
If the tank is AL and it is old it could also be the problem. You will need to open the tank, inspect and de-fuel it. (filter the fuel out and put it in your truck)
Ethanol has caused more marine fuel tank problems than you can count.
C) maybe you just got a bad batch of fuel with bunch of crud.
BTW, if you have fuel injectors, you DO NOT want this crud to reach them!! You might be looking at more serious repair expense. Keep that fuel clean.
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