Hi Mal,
AUB 662 is the part number of the body only. The fuel pump itself is an AUF
301 (also called AUF 303 later for replacement purposes).
The AUF 301 pump was introduced in August 1964 on both the MGB and the BJ8,
and now included a capacitor / condenser to reduce points burning.
In December 1967 the MGB Mk II and the MGC were introduced with negative
ground systems and alternators. In January 1977 the MGB got the AZX 1307 pump,
now fitted with a diode instead of a capacitor.
The AZX (diode) pump is polarity specific and was originally wrapped in black
tape for negative ground and red tape for positive ground. The diode itself
has two wires which can be swapped over, or a diode with the other polarity
can be bought.
Your AUF 301 (condenser) pump has only one wire for the condenser / capacitor
and as I understand it can be fitted to either polarity car. ( this site says
so-http://www.mgb-stuff.org.uk/fueltext.htm ) It originally had blue tape
wrapped around the body-cap joint, and had a stepped cap.
Best
Peter
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