Don't  forget that you have to account for the returning fuel as well.   Total
flow in my system is 40 gal/hr but depends a little on where you set  your
fuel pressure.  If I turn on both fuel pumps at once, my total  fuel flow is
almost 80gal/hr.

Dave Leonard

OK,

What are you really monitoring here.

If it is fuel pressure, you want your sensor as close to the endpoint of  the
run as possible. Any other place is subject to question as any restriction
anywhere in the line from where the sensor is, to the carb, fuel rail, or
spider  will give you a fuel pressure reading, but you have no idea of if that
pressure  is really doing anything for you.

With respect to the flow scan, measuring the flowage out of the tanks, as
has been stated is useless. Your sender should be, again placed as close to the
end point as possible for any reliable results (ie leakage etc) Some fuel
injection systems shunt the fuel back to the tanks before going to the fuel rail
or spider (Airflow) and some give total flow to fuel rail and a relief valve
at  the end relieves itself to the tank. In the latter case,m what you need
is an  additional flowscan unit on the return line and some logic to subtract
the  return pulses from the supply pulses, and your reading will be accurate.
Ron  Mowerer of Rocky Mountain instruments, I believe, has such logic already
in  production.

If you are going to measure something, make sure that the indication that
you are getting means something. Otherwise, why measure.

Rich (first posting on this list)


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