Leaking shurflo pump - which spares ?

There is no gasket between the motor and pump head. When I took a similar pump out there was also signs of leaking like you describe but very very minor. Have you tried tightening up the bolts holding the pump head to the motor alternatively take it apart, coat the joining surfaces with "gasket seal" and put it back together. A replacement pump costs about £50 plus postage and is probably a better buy than obtaining a replacement head. 

peedee

I think it is the edge of the diaphragm that serves as the gasket, but it is some years since I had on apart and memories fade.

The area where I observed there had been leaking was at the junction of parts 3 and 4. The only other area it could leak from is between parts 1 and 3. Part 2 is installed internally. My problem which caused me to remove the pump was air getting into the system  manifesting itself as poor pump performance. I chose to fit a new pump and recondition the old pump by replacing part 2, the valve kit. and retaining the old pump as a spare. See >this thread<

peedee

Hi peedee, thanks for the info. I have previously tried tightening up the bolts, but on the basis that there was some form of gasket/washer there did it gently - a compressed washer just goes rigid and stops doing what its meant to do. It improved, but only for a period. If there isn't a gasket and its just the diaphragm edge then I may try tightening it more.

"Gasket Seal" is a good idea. I might however do as you did, and replace and save as spare. I think I saw the TK 7 20psi (which is what it is) at around £65.

Thanks for the assistance.