Thanks to any or all...
It's dark outside right noe. When it gets light outside I will take a
picture of my pump and post it.
http://inyopro.com/images/injection_pump.jpg
Thank you very much for these photos, as they clear the question up
perfectly. I think I was looking for something more obscure down in
the back of the injector and missed the obvious thing right in front
of me.