Dam you're lucky bro! I'll bet a nickel you've got a rotted out tank. Mine had the same symptoms you described, minus the explosion and I had holes the size of your fist in my tank when I finally got it pulled out. Foam holds moisture and rots out aluminum tanks.
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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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