Fuel pressure sensor
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Please keep your posts friendly and on topic. No politics or discussions of a controversial nature not related to our favorite subject of flying and avionics. Offending posts may be removed or moderated.
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Awalkerch750
- Posts: 8
- Joined: Wed Jan 06, 2021 10:48 pm
- Location: Fitzgerald, GA
Fuel pressure sensor
I have a three-wire automotive style fuel pressure sensor/sender 0-5 volt with signal wire. My Discovery Lite EFIS set to this style sender reads 7.7 psi with nothing hooked up. After attaching the wires to the RDAC the efis reads 4.2 psi. Using a manual gauge installed in the fuel line I know my fuel pressure is 42psi. Any help appreciated.
Re: Fuel pressure sensor
You need to switch the pull-up resistor OFF.
It is forcing full scale (5V) with an open input, and pulling the sensor reading higher than actual.
It is forcing full scale (5V) with an open input, and pulling the sensor reading higher than actual.
Stuart
NZ MGL dealer
NZ MGL dealer
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Bill Hertzel
- Posts: 48
- Joined: Sun Sep 13, 2020 3:26 am
- Location: Ohio, USA
Re: Fuel pressure sensor
Have you configured all the settings properly?
Menu>System Setup>Fuel Related Setup>Setup RDAC1 Senders>Fuel Pressure Setup
It sounds like the system thinks 5 volts = 7psi instead of 70psi.
Also, confirm your sender is 0.0-5.0v and not the more common 0.5-4.5v; it makes a difference.
Menu>System Setup>Fuel Related Setup>Setup RDAC1 Senders>Fuel Pressure Setup
It sounds like the system thinks 5 volts = 7psi instead of 70psi.
Also, confirm your sender is 0.0-5.0v and not the more common 0.5-4.5v; it makes a difference.