did you try running the pulse line on the other channel ?
the pump….Obviously a leaky pump is not acceptable but it seems your pump diaphragm does not mind the fuel/oil as a pulse medium versus just air pulsing .
the fuel-oil & air mix acts as a hydrolic fluid and keeps things going as it flexes the diaphragm and the engine works ok
I would try another pump before giving up on it. .
I have one or two round B S pump… tomorrow I will try pushing some water in the pulse nipple to see it the gold screen leaks . I even suspect that that part of the pump should hold a pound or two of simple air pressure !
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