Leaky 1275 Spridget Motor, seeking help

[ejrussell@sprynet.com]

Seeking help from knowledgeable Spridget owners. I am helping a friend repair a 
Morris Minor that has a 1275cc Spridget engine. It is leaking oil from the back 
plate. We cranked it over (out of car) using a heavy-duty drill motor and have 
confirmed it is leaking from the oil pump. Is this common and how does one make 
an effective fix? 

Already tried new gaskets...

Eric <ejrussell@sprynet.com>
Bridgewater, MA