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Return of unused fuel to reserve tank

 
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Europa48



Joined: 01 Feb 2018
Posts: 13
Location: Kelso

PostPosted: Sat Jun 23, 2018 10:48 am    Post subject: Return of unused fuel to reserve tank Reply with quote

Hi

Does anyone know what the normal rate of fuel return is from a Europa Xs main fuel tank to the reserve is? Is it necessary to use the reserve side first before switching to the main tank to allow space for unused fuel to be returned, or does any excess just go to the main tank.

Thanks


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budyerly(at)msn.com
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PostPosted: Sat Jun 23, 2018 7:11 pm    Post subject: Return of unused fuel to reserve tank Reply with quote

The hump in the tank bottom allows the returned fuel to enter the tank reserve side and spill over to the main side until the fuel level drops to about 2.5 gallons remaining. Once the main side of the saddle is exhausted of fuel (2.5 gallons remaining), of course the engine quits if the selector is on main, so the fairly standard procedure of:
Aux fuel pump On
Fuel Selector Reserve
Engine Restart if not wind milling above 200RPM

This will allow you to have the remaining 2.5 gallons US on the Reserve side of the hump for about 20-30 minutes before total fuel starvation. Hopefully you never have to be that low on gas.

Keep in mind, if flying in a very high angle side slip will splash fuel from one side of the saddle to the other when fuel level is down to about 4-5 US gallons remaining.

Please study the cockpit module and fuel tank description in the build manual for a clearer picture of the tank shape.

Fuel return is very small at high cruise and normally is about 1-2 gallons depending on 912 engine type over a full 2.5 hour flight time. The 914 return is quite high at low power and low altitude and lower in full power operations at high boost.

Sent from Mail for Windows 10

From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> on behalf of Europa48 <corinthian(at)me.com>
Sent: Saturday, June 23, 2018 2:48:20 PM
To: europa-list(at)matronics.com
Subject: Return of unused fuel to reserve tank


--> Europa-List message posted by: "Europa48" <corinthian(at)me.com>

Hi

Does anyone know what the normal rate of fuel return is from a Europa Xs main fuel tank to the reserve is? Is it necessary to use the reserve side first before switching to the main tank to allow space for unused fuel to be returned, or does any excess just go to the main tank.

Thanks




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