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911pete
Joined: 09 Aug 2018
Posts: 2
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 Posted: Thu Feb 19, 2026 9:57 am Post subject: Fuel System Manager |
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Hi
My airplane project requires a fuel system manager, or AFC (Auto Fuel Computer). The System consists of 2 wing tanks and a center main tank. The engine feeds from the main tank only. It is a 28VDC system
The electrical components of the system are a High Pressure solenoid, 2 low pressure solenoids (1 for each wing tank), a high level sensor and a low level sensor. 2 3 position switches (Off,Manual,Auto) and a low level or "bingo" light. There is also a jet pump (non electrical) that uses high pressure fuel from the engine to "siphon" fuel from the wing tanks to the main tank.
All the solenoid valves are Normally Open and require power to close. The fuel level sensors are NC or Normally closed. The planned sensors FU-ll25-03 from SMD Fluid Controls. I have attached a copy of the data sheet.
LPFS is Low Pressure Fuel Solenoid
HPFS is High Pressure Fuel Solenoid
Auto Mode Single-
When the pilot selects the “Auto” mode on either transfer switch the fuel computer reads the level inputs from the fuel level sensors. If the fuel is below the low sensor the AFC will remove power from that selected LPFS, allowing it to feed fuel into center tank. It will continue this until the high sensor tells the AFC that the center tank is filled to its location. At that point, the AFC will apply power to the selected LPFS to close it.
Auto Mode Double-
When the pilot selects “Auto” mode for both transfers, both LPFS’s are controlled as above.
Manual Mode Single-
When the pilot selects either transfer in “Manual” mode then the selected LPFS will have no power and therefore be open. The HPFS has no power any time that either LPFS has no power.
Manual Mode Double-
When the pilot selects both transfers in “Manual” mode then both LPFS’s and the HPFS will have no power and therefore will be open.
Off Mode Single-
When the pilot selects one transfer switch into the “Off” position the selected LPFS will be powered closed. No fuel will transfer from that wing.
Off Mode Double-
When the pilot selects both transfer switches into the “Off” position then both LPFS’s and the HPFS will be powered closed. This is the position for start up of the engine
Finally if there is an 20 second uninterrupted signal from the low level sensor the low level light is activated.
Originally this was operation was controlled by the use of a PLC (Programmable Logic Computer) system. I can't get anyone to provide me with it. Can a system like this be implemented using other means?
Any help would be appreciated
Pete
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Ultrasonic Fluid sensor.pdf |
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Last edited by 911pete on Thu Feb 19, 2026 3:17 pm; edited 2 times in total |
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user9253
Joined: 28 Mar 2008
Posts: 1949
Location: Riley TWP Michigan
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| Posted: Thu Feb 19, 2026 2:09 pm Post subject: Re: Fuel System Manger |
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What is the make and model of this aircraft?
Is it factory made or experimental?
Is the fuel gasoline or diesel?
What fuel pressure does the engine require?
Have you considered using a manual 4 position fuel valve; left, right, both, off?
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Joe Gores |
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911pete
Joined: 09 Aug 2018
Posts: 2
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| Posted: Thu Feb 19, 2026 2:18 pm Post subject: Re: Fuel System Manger |
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The airplane is a Viperjet, experimental. The fuel is Jet-A. There is a boost pump after the main tank to supply the fuel control and isn’t part of this system. This system is just to move fuel from the wings to the main tank. A manual fuel valve wouldn’t work in this application
Pete
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