Uggh, my meth kit has been working since I bought the truck, the pump is in the same location and now it has 60Kmiles on it, it's been working flawlessly and sprays very well.
Every truck that has come through the shop has the pump in that same location; dozens and dozens of installs, and no returns on pump failures.
Just to add to it, I never have fluid in the meth tank (because i'm too lazy to fill it) and I run weeks and months with no fluid in the tank, with the pump pumping (the LED illuminated), and it's still good.