If you have removed the pump, then it's a quick job to open it up and clean inside. Undo the screws on the bottom half and open it up. Sounds like you have maybe an open valve on the intake side, and a stuck valves on the output.
There are no gaskets involved with opening it up other than the diaphragm. Once open, you will see the check valves...they are held in with metal keepers. Each valve is spring loaded and points up or down, depending on it's job. Just poke the seats with a non sharp item, and make sure the little spring forces the seat back.
The fuel which dried up in the pump over all those years will usually form a white powder. Often, there will be other crap stuck in the fuel pump: contaminants from the tank and the lines. Clean out the pump, and perhaps put an inline filter in the short rubber flexline before the pump if contaminants were found.
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18-11-12, 16:54
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