Re: Case 580 CK Roosa Master/Inj. Pump
Sounds like the plastic coupling inside the pump has disentegrated and the debris is clogging the return line. It's not a uncommon problem for older RoosaMaster/Stanadyne pumps.
To check for this, remove the return line from the pump. This will be the line that goes from the top cover of the pump, up to a tee fitting on the number one injector. Now remove the fitting from the pump that this line was hooked to. There should be a glass ball and a spring inside this fitting. It's a one way check valve. Check inside the fitting for black plastic/rubber debris. If there's any debris there, you should remove the pump and have it repaired.
The new coupling will be made of metal and you shouldn't ever have the problem again.
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