TEF20 CAV Injection Pump enigma!

Evening all,

I'm trying to spill time a CAV injection pump on a TEF20. I understand the theory but I;m confused about the way my pump is behaving. When I give it fuel and turn the pump drive, I get fuel coming out of 3 pipes, not the one which I assumed would be the case. The flow of fuel I expected as the piston rises, doesn't happen on the piston that's rising, but the other 3! Another issue is the the cam chamber at the bottom of the pump seems to be filling with diesel!

Any suggestions?
 

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