Madison Co. Virginia | JOAt-MOn - 3/27/2026 17:23
This….the black one that was under the screen is what I was talking about.
Thanks! I watched yet another demonstration video about how these rotary pumps work, and the function of that valve makes better sense now. The red o-ring sealing the tip of the valve body is the only one that keeps the 100-ish psi case pressure separate from the low inlet pressure. The pressure regulating valve dumps excess pressure back into the inlet side by sliding past a small slot and hole in the valve body.
I got the pump back on the tractor tonight, and filled the governor housing with clean fuel. If there's no obvious leaks in the morning, I'll give it a go with bleeding and starting. The wet spot you see there is just where I forgot to close up the timing window before dumping fuel in the top of the pump.
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 (KIMG0435 (full).JPG)
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 KIMG0433 (full).JPG (208KB - 1 downloads)
KIMG0435 (full).JPG (172KB - 1 downloads)
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Roosa-Master injection pump -- can someone confirm this part orientation?
