What's the rated current draw on this pump? If it's like the cruise actuatator and in the milliamp range, a 1amp fuse may do you no good.

What I'd do, and mercedes should have done, is let the ACC board operate a relay, and the relay would bare the amp load of the pump, not the relativly fragile ACC. Granted most of them work for a decade or better, but simple as it would be, it seems a good idea.

Same logic applies to the cruise amp, and I believe they would last longer, you just shouldnt drive a motor off a transistor setup like that. One day I'll try and rig a relay setup for the cruise as well.

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1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K