One pump will feed the rear screen while the other is for the front. One front jet working suggests pump is fine surely? Could be a blockage in pipework or if you can follow the pipework there will be either a "T" piece or "Y" piece where the pipework splits to feed the two windscreen jets[same I'd think goes for headlamps]has the pipework come off at these?Are the pipes split/kinked/holed? Just a few things to check before splashing the cash on new pumps.Two wires directly from battery terminals to pump terminals would prove if pumps are working or not.
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