When tested it would not work so needed repair, we stripped it and cleaned the contacts (one end at a time) in the first end we found some surface rust on both upper and lover contact assemblies, these were cleaned but the contacts are pitted, once re assembled that end worked fine once the contact gaps were set. We stripped the second end to find the upper contacts snapped, though otherwise everything was quite good, we borrowed the upper contact from the other end to test it works fine, both coils have a resistance of just over 3 ohms which is correct.
These pumps seem to be quite rare now and good ones are advertised for a couple of hundred pounds or more, this one needs the contacts replacing, it is listed on ebay at the moment with a starting bid of £40 http://www.ebay.co.uk/itm/SU-double-ended-fuel-pump-/131811307816?hash=item1eb090f128:g:bmAAAOSwt7pXM51I
Contact sets are advertised on ebay at around £15 a set and there are videos on you tube.
This pump was sold for £26 plus P/P