Fuel Problems??

[shana]

Hi All,
I just purchased a 1975 20' Seafari Seacraft and I'm running into some problems. Hope you guys can help a newbie out...Well, it runs fine, then when you throttle up it bogs down and shuts off...We think that we're not getting enough fuel to the engine. Here's what we did so far. We drained the tank and replaced the old gas (some water was in it). Then we drained the Mercury (engine) carbs. We replaced the fuel filter and blew the lines out. Still happens. We notice that when we pump the fuel primer ball that it works better, but then the ball becomes flat and we cant pump it any longer. We then took the cover off the fuel tank area and blew out the vent. Then we thought that there may be a clog in the line in the tank, but when we took the 90 degree thingie off, we expected to see a hose, but found a metal tube which went from the top of the opening to the bottom of the tank. We could not figure out how to get the metal tube out and we were surprised that it wasn't a rubber tube with a screen on the end. Please Help!!! Any Suggestion would be appreciated