Running some type of snake, (old vhf antennae) through the drain plug and then feeding it through the pvc pipe under the tank may clear a blockage. Shooting some compressed air through there might blow it out as well.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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