I never new how easy it was to repair my window washers when they were leaking. took them all apart in 30 mins and put back how easy it was then pumped them up with my bike pump.
just pumped up then found the leaks where the tiny cable ties go on to the washer leaver i cut them of and put new ties also my wiper arm and indicator kept spinning around the colum so i put in two bits of plastic and is now great, killed two birds with one stone
I use a portable tyre compressor to pump mine up to 42psi when I check my tyres - it is nice to have such a quirky system and it works (how very German )