Hi you should never put a kink in any part of the washer pipe as this will cause all sorts of problems the pipes are routed with gentle bends and you will never lose pressure because both circuits from the pump have anti drain-back valves so when the pump is not being used the valves shut to maintain the pressure, example, last summer one of my cab colleagues could only get his washers to work at the front with the bonnet up, turns out he had replaced all the feed tubes with silicone hoses but forgotten to do each section against the old pipe so the one that went to the tank was about 10mm to short and kinked when he closed the bonnet, thats how critical it is.