Did you check the bellows? Be sure that you are, in fact, sucking when the piston is moving.
In my experience 3, 4, 5 cycles should get you something unless there is a blockage at the jet, a bad supply line, or a bellows not sealing tightly against the wall and not producing any suction.
Best advice OTTOMH.
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Lewis
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Lewis Rosenthal
'63 Bonneville Convertible
'56 Safari
'82 Firebird SE
POCI #3596 (since 1978)
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