1. Don't replace your old petrol pipes with black cotton-braided pipe from the car spares shop, no matter how cool it looks. The braid hides the perished rubber and doesn't show the leaks until they start gushing. 2. Occasionally turn the petrol tap to "prime" while fettling so you can smell any leaks rather than discovering that your boots are soaked when stopped at traffic lights. 3. Don't buy a Vauxhall. My naughty water pump seized, snapping the timing belt and breaking the tensioner pulley off the oil pump casing. Replacing the oil pump requires the sump to be removed, which requires the engine to be removed....