Perhaps your pump froze and the PO 'fixed' the problem by unplugging it. If you have an ohmmeter, try that first. If you connect the pump to 12 Volts and get sparks but no noise of motor running, the pump or the motor is frozen. If you get no sparks and no noise either, the motor is burned out.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970