Wierd washer pump behaviour

Hi all, my washer pump wasnt making any sound so I purchased a replacement and fitted it.

I ran a test prior to connecting the pipes back onto the pump itself, water shot from both nozzles individually.

Now the wierd part.

Upon connecting the pipes back on, the water only comes out the rear jets, whether I push the wiper stalk or pull it towards driver??

I disconnect the rear pipe at the pump itself and then the front ones work.
I put my finger over the rear pump nozzle, then no water sprays at all?

For the MOT I connected the pipes in reverse so whether you push or pull the wiper stalk, the front jets spray.

Any ideas?
 
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