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Mine does something similar but I can hear the clicks but not the pump working. This happens every now and then. I'm almost sure is the pump but since this is intermitent I have not been able to check for voltage on the pump. I'm thinking about throwing a line to the positive terminal on the pump and hooking the voltmeter so when it happens I can be sure of my diagnostic.
If there is voltage and the pump doesn't work it is the pump if I have no voltage then something else is wrong as an example the main relay.
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