My 20B came with a 4-port injector/metering pump from a 13B with three ports feeding the 3 rotors and one port blocked.  The pump began leaking (dripping out around the adjustment lever shaft) during the dyno runs; and then continuing to get worse as the pump finally stopped pumping after a total of maybe 4-5 hrs operation.  The replacement pump pumps very well, but immediately began showing some leakage.

 

I don’t know the outlet plumbing of the pump, but it is a positive displacement from the plunger, and as metering pump I’m thinking it may be setup for positive flow to each port; so blocking a port may be the cause of the leakage and failure.

 

Anyone have some input on this?

 

Thanks,

 

Al