Quote:
Originally Posted by Texasdoc
I disagree with this statement: The factory internal bypass is way higher than any normal pressure setting for carbs
Only my pump is set at 7 pounds. It can pump out more but the pumps regulator sets the pressure at 7 pounds at the pump's output.
Now you take that 7 pounds, push it thru a 40 micron filter, along 8 feet of 3/8" hose plus connectors to the pressure regulator. The pressure drop is around 3 pounds, leaving me with maybe 4 pounds when at max flow.
If I had bought the 140 which is pre-set at 14, this would work since the pump's internal bypass would not get activated. But I don't have that pump.
So, I need to block my pump's bypass so it will go above the factories setting of 7, so I can actually get my desired 6.5 at the carb - letting the fuel pressure regulator control the final pressure.
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Ah yes, you are correct there.
You have Mallory's equal of Holley's Red pump.
If you can't get the spacer, you could make one, but I would be fitting a heavier spring.
I think it would a safer option to fit a heavier spring?