Originally Posted by ZetaTre

Normally the issue is not the tank which would actually be even a greater PITA to replace since it requires the removal of the whole fender.

What cracks are the pump. There's 3 of them (front, rear and headlight). The headlight's is different style being high pressure and it's mounted upper in the tank (it draws quite a bit of fluid when it runs and being higher up avoids the headlight to dry the tank empty, leaving you the ability to at least wash the windshield). That pump is normally fine

The two smaller pump for front and read crack. They leak down towards the bottom where they plug into the tank.

To get there you need to remove the wheel well cover. There's several bolts, and plastic rivets that hold the fender liner, you'll have to loosen the running board. Eventually you get there and you need small hands to crawl in and unplug the pump. If you don't have small hands then you have to release the bolts holding the fender. It's plastic so it flexes a bit without running the risk of bending it permanently.

Because it is time consuming to get there and the pumps are 50-60 dollars each (don't ask), expect it to be a 500-600 job. In the X5 BMW uses some "quick connect" on the hoses and the pump is the exact same type of the older one with push on rubber hoses (that cost 10 bucks on Amazon), but has a different nipple to attach the hoses... So it doesn't work and you gotta get the BMW labeled one and fork out the 60 bucks

When one of mine broke, I ended up replacing both of them because I didn't want to be in there any time soon.

If you look around on forums for E70 X5 washer pump replacement you'll see it's common and you'll also find plenty of tips and advice...