[2013GV]

I have disconnected mine and flushed it with compressed air. Then installed an inline non return valve. It works perfectly the line is always full with washing fluid. 1 $ solution and now I have instant washing when the switch is turned.

There's a factory fitted non return valve in the line by the connector at the rear door where the line goes thru the bellows.

 

[2013GV]

Mine failed due to inter mixing different washer fluid brands, went to a sludgy gel and it never worked after I flushed the lines. Found it and replaced it, took me about 5 minures