Check the size of the fuse protecting that plug. They usually are not rated to handle 20 amps. 20 amps at 12 v is 240 watts. You'll need heavier gauge wiring and I'd wire it directly with a fuse in the circuit. If you want the pump to be portable, install it with a dedicated, properly rated, connection. A cigarette lighter type plug isn't rated for that kind of power. Most every plug has a fuse under the nose pin, much less than what your pump needs.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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