[Healeys] Fuel pump polarity

[Simon Lachlan]

I have an AUF301 SU pump on the bench. Old, but looks serviceable with new
points and a bit of tlc.

How can I determine its polarity? (I'm not sure where it came from or when).

It's not electronic(!) and has - I'm hopeless with electronic terminology -
something which resembles a small condenser across the points. There is no
obvious left or right/pos or neg appearance to this thing....looks like it
goes on either way.

Any ideas?

Simon