MG Car Repair: MGB71 Fuel pump, mg car club, positive earth

Question
My MGB from 1971 needs a new fuel pump. I have looked for a spare part but there are several different pumps for sale. Ones with negative or positive earth. How do I know what pump I actually need for my MGB? Any advice would be appreciated.

Answer
The MGB went from positive earth to negative earth around 1965.  Your car is a 71, so it is negative earth.  If you have any doubts, check which way the batteries are connected.  

The correct pump for your car is an AUF305 (Moss part #AZX1307).

Pumps are expensive (about £100) and you may not need a new one.  Mostly, the points burn out.  If you replace the points (cost about £12), then your old pump should be good for another 10 years.  Make sure you buy twin points (AUB6106A), they last longer.

For more advice, see my new book on the MGB (Barrie's Notes) available through the MG Car Club.