Fuel pressure hose - servo to transducer

[plehrke]

I am replacing the fuel pressure hose that runs from my Bendix RSA-5AD1 servo to the fuel pressure transducer on the firewall.
Question: Since there is no flow in that hose, is it necessary to pre-fill it with fuel to eliminate the potential of hysteresis in the fuel pressure gauge due to a hose full of air? I don’t remember from when I put in the hose the last time.

 

[Avanza]

You don´t need to fill up the hose with fuel.
The small amount of air will dampen out any pressure fluctuations.
In fact, it´s easier to connect the transducer without fuel in the hose.
Make sure that sealant used is compatible with fuel.
Permatex or Hylomar will work.

Good luck

 

[TS Flightlines]

Phil, we've found that all the pressure hoses are somewhat self-purging, other than the brakes of course.
Tom