Ed---The sole purpose of a fuel regulator is to provide a constant
pressure in the fuel line after the pump. This assumes that the engine's
fuel intake is not more than the capacity of the pump, or the setting of
the pressure regulator. It would be rare for the engine to need more
than 3 lb. of pressure, unless extremely modified. Running a typical
solid state pump, good for about 5 lb. psi, can on occasion sink the
floats, as Ed pointed out. The regulator set to lower the pump's
pressure will save this from happening. At the end of Don's reply he
mentioned that he will be using an 02 sensor and A/F monitor to check
the 'vital statistics' on his particular modified setup. I must agree
that spending $1500 +/- for Webers and not knowing whether it is jetted
correctly for the engine is a crap shoot. For another $150 or so, you
can install the modern equipment in the exhaust system to tell you
exactly your fuel-to-air mix at ALL rpm ranges and engine loads. It is
relatively simple to install and use. Too much OR too little fuel can
cancel out the purpose of going to different carbs.
Be wary of what some of the parts suppliers advertise about the use of
regulators. They would have you believe that these gadgets will stop
high end fade,
regardless of the reason. If your fuel supply is sufficient, and the
float needle valves let in enough fuel to keep up. then you can just
about bet that any high end fade is cam or valve spring related.
Dick T.
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