REFLECTOR: Fuel Pressure == 0!?

Tom Martino tmartino at troubleshooter.com
Sun Jul 1 22:46:29 CDT 2007


A bad sensor can read low.  Or a bad ground to the sensor.


On 7/1/07 8:36 PM, "Hiroo Umeno" <humeno at microsoft.com> wrote:

> I got the brakes bled and I think I got it the way I want.  It took a while to
> get all the bubbles to go away but I am fairly certain that they are all gone
> now.
>  
> On to a new problem (sigh).  While I was checking to see if the brakes will
> hold the plane on run-up (it did fine), I noticed that the fuel pressure was
> reading ³0².  With the boost pump running, it was reading 3psi or so while the
> engine was running.
>  
> Very strange as I am used to seeing about 6-8 psi with the boost running.  The
> engine continued to run perfectly normally and the fuel flow was indicated at
> 13Gph or so when I was running at a fairly high rpm.  The fact that I get
> reading at all seems to indicate that the sensor is working fine.  The fact
> that the engine runs along happily means that there is no fuel system
> blockage.  I am a bit stumped.
>  
> I have a Franklin with the fuel pump AD complied with. I also have a check
> valve bypass for the engine driven pump for when the fuel pump bites the dust
> (the fuel pump fails closed).
>  
> One thing I can think of is that if the mechanical pump actually did fail,
> then the carburetor is essentially ³gravity fed² and it will show 0 (or very
> little) fuel pressure.
>  
> Does anyone know how I can check the operation of the engine driven Franklin
> pump?  What are the known (and likely) failure modes for these new pumps?
>  
> Hiroo
> 
> 
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