The solution is easy,

a. Get your wife to buy things for you e.g. the pump and Landrover parts.
The down side to this is that then she will control what you buy a little more, this will make her happy but will ruin your free rain you have now.

b.Get your son to buy stuff for you and to clean up the dog do's, it might cost you more as im sure he will want to be paid for it but would be easier than explaining every purchase to Mrs P38 more than likely.
This has only 1 down side and that is he then has amunition for bribery depending on what you want Mrs p38 to know about will depend on how much you will need to pay him to keep his mouth shut.

c. Buy good quality stuff and check it before you buy it with anything you can like the pump. By the way it sounds like the fan must have been hitting the grill and at 3000 odd RPM it doesnt take long to through it out of balance and then have it rattle it self to death.

__________________
I have no signature......