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the internal bypass concern involved a concept using pump rotations and fuel control rod position a few pages back.
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I thought it might be something like that. fuel rate from the tank, compensating the return line of course, is still going to reflect fuel demand by the engine. Sooo the zemco's or a pair of zemcos would still work.
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if the ball melts in the old zemco a 6mm BB works nice.
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You know that is interesting. I have heard of that happening but the last one I rebuilt had a very hard plastic ball with a fairly thin skin. Id say pretty roughly the same mass as the fuel and I would think that would be important for universal positioning.
If i remember correctly there is a rubber piece that acts as a nozzle inside. Perhaps that could be sized for the engine? It is enough of a restriction that larger engines can be starved for fuel.
Do you happen to have one on hand? My father has one that I fixed and I am going to see if he can bring it back from Idaho the next time he visits. See if I can't figure a way to improve or dupe the design by cast or machine.
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there probably is an inexpensive impeller in a fish bowl pump or
something that would make a good flow meter, we just haven't found it yet.
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You really think that would stand up to gasoline and hot diesel fuel?