Good pics - surprised you're getting that much soot.

I recently replaced my shut-off valves (both at IP and key switch). When I tested the shut off valve at the IP, I drew vacuum with a pump and watched oil run up the vacuum line!

I suspect a decent amount of oil had pulled up that line as it had invaded the key switch valve.

I've thought it might be a good location to place a filter - along the IP shutoff valve line - in the event the diaphram leaks again.

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83 300d - 390k