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When the 5 ohm resistor is added (with or without the capacitors, the power supply stays alive, but the pump does not react at all. The pump doesn't start, bump, hiccup. Nothing. The voltage drop across the 5 ohm resistor is about 1V (which gives about 200mA).
Something is not adding up here. This result suggests the pump has a DC resistance of 55Ω (11*5) which means it should never draw more than 1A never mind 20A. How did you have this wired?
....If there's confusion then it is being over thought....