Low Pressure Fuel Supply Pumps
Hi Everyone,
The fuel in my RV-10 is located in three tanks. Left and right wing tanks of 30 gal. each and an auxiliary tank located in the baggage compartment.
As mentioned earlier I have installed a header tank on the cockpit side of the firewall. This header tank needs to be full of fuel all of the time as it supplies the high pressure Walbro fuel pumos that charge the fuel rails on the engine.
I have installed two Facett fuel pumps in the bottom of the center tunnel on a bracket that has them angled up from horizontal 45 degrees. This is necessary to make sure that bubbles in the fuel do not congregate in or around the pumps. This also helps stave off vaopr lock if the fuel gets too warm. I shouldn’t have too much trouble with this as I am returning unused fuel back to the tank supplying the system.
I have run the two pumps in paralell in the same fashion as the high pressure Walbo pumps. I am building an IFR capable aircraft with all of the necessary redundancies of which dual fuel supply and pressure pumps are a part.
I used aluminum tubing with AN flared fittings throughout the installation and made sure that all of the lines were supported and isolated from other items in the center tunnel. I took great pains to make sure that the fuel lines were routed away from heat sources such as the cabin heat exchanger.
Each of the Facet pumps will have its own power supply from independant sources so that an electrical system failure won’t put me out of business.
Here is a picture of the tunnel with the pumos in the center bottom.
Dave