[Mgs] MGA FUEL PUMP [now MGB]

[Paul Hunt]

Very interesting, although *in theory* the pump should operate for many 
years with just one contact.  But maybe the twist is such that it is 
preventing even one contact closing properly.  Or maybe the MOV isn't as 
effective at quenching as the diode was, which was better than the 
capacitor, and the single working contact is burning and insulating.  The 
theory of the two is that if one burns and insulates it will still get the 
mechanical rubbing action which will eventually clean it again, but it does 
need both to make contact enough to lift both sides of the fixed contact a 
little at least.

But before removing and opening up the pump do check that you have 12v 
between the two spades on the pump, i.e. it isn't an electrical failure 
elsewhere.

PaulH.

----- Original Message ----- 
> Ah-ha.  If this is a points type pump a couple years old, I have some 
> detailed information that may explain this mode of failure (maybe).
> http://mgaguru.com/mgtech/faulty/ft037.htm