It sounds as though it may be either a duff pump or a blockage in the pipe
You could rule out a duff pump by putting it in a bucket of water and running cable from a 12V source to the pump terminals
You could either run twin cable from the car battery or use a jump start power pack
It could possibly be a blocked/stuck non return valve as well
Good luck
It would be worth trying another Whale pump if you were on site and could borrow one
Where are you in UK?
Strangely enough a friend has just paid me for a replacement pump today
------------- John
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