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I used a Carter fuel pump in a water cooling system for a portable diffusion pump but, after two pumps failed, I checked into the pump's construction and found that it was a type of pump that uses the fuel as a coolant for the motor. They circulate the fuel through the inside of the motor case as well as in the pump section so the water was actually being circulated in the pump. The 12V caused a small electric current to flow through the water (it actually had some ethylene glycol added) and this current eventually erroded the wire braid connection to the brushes. When the brush contact was eaten through, the pump stopped. Lesson learned!Regards, Neil Tucson, AZ