REFLECTOR: Fuel pressure

[John Dibble]

Check that you have a good ground for the pressure sensor.  A poor ground will cause a
high reading.

John

Gilles Gratton wrote:

> Carburetor help,
>                      My Weldon fuel pump on my Franklin engine is delivering
> 8-9 psi. Is this acceptable or too high? I have already adjusted it down
> from 12 where it was when I installed it. What kind of problem can too high
> a fuel pressure cause on the carb, if any.  I have a Precision Airmotive
> carb, model MA 4-5.
>            Sometimes when I turn on the electric boost pump while climbing
> at full throttle, my engine runs rough.  This clears up when I turn the bost
> pump off.  What could be happening here?
>      I use the Facet electric boost pump as recommended by Velocity. My fuel
> line system is
> 1. sump tank
> 2. shut off valve
> 3. filter
> 4. Facet pump
> 5. engine pump (Weldon)
> 6. carb
>          My fuel pressure gage is on the line from the engine pump to the
> carb.  I also have a parallel line with a one-way valve by passing the
> engine pump and running directly from the Facet pump to the carb.
>    Are everyone using those Facet pumps or is there a better one.
>
> Any theories on the rough running engine.  I have ruled out carb icing by
> applying carb heat to no avail.
> Gilles
>
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