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"I have not seen one of these roller pumps, not work, if it turns..."
Agreed with this portion of your thought. The Bosch supplies plenty of pressure if given electricity and liquid fuel to pump -- and it turns.
If a broomstick tap gets it going, it wasn't turning. A hand on the pump can reveal whether it is turning if not an ear. However, we don't know if the OP's pump was turning; only that it had voltage.
--
Art Benstein near Baltimore
Flowers leave some of their fragrance in the hand that bestows them. -Ancient Chinese Proverb
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