So I'm rebuilding the petcock on my 78 GS750 since small amounts of fuel were leaking from the lever when I switched from "prime" to "on". I have to say that these older petcocks are much more complicated than necessary compared to the one on my 82 GS1100. It's got the double diaphragm in the back too. So, I put everything back together after a thorough cleaning and it dribbles fuel in both the "on" and "reserve" positions (bench testing with tank on workbench with <1 gal of fuel in tank). Ugh!
Obviously it's getting air from somewhere for the fuel to flow. I double checked the double-diaphragm by removing it once more and all was well. I feared that I might have put the plastic plate that goes between the diaphragms in backwards, but it's sitting the right way. Once I had a look at it again, there's only one way it will fit if the small hole is going to line up properly. The small spring is in there too.
So, if the diaphragm is in there correctly, all snug as a bug, how in hell is this thing getting air? It didn't leak at the hose output before I did the rebuild. Anyone have a similar experience?
Help! Thanks!
J
PS. Don't want to go the pingle route. Don't want to drop the $$$ and don't want to turn my fuel on and off every time I ride.
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