I have a 3-screen Garmin G3X panel (non-touch) that is working perfectly except my fuel quantity indicator on the right wing has gone wonky. Even after filling the tank, it indicates zero fuel. I?m assuming this is a problem with the sending unit but I wondered if anybody has any other insights. I?m guessing I probably need to replace the sending unit however my RV-7A is over 10 years old and has one of the old Stewart-Warner units (#F385B). I need to get this problem resolved before AirVenture since I will be flying from south Florida. If it is a sending unit issue, what is the sending unit you folks are installing? I currently use the float (resistive) type unit and that?s what I plan for the replacement.
Van's Air Force
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Fuel sending unit problems
- Thread starter wjnmd
- Start date
Carl Froehlich
Well Known Member
Some things to check:
- Is the sender center wire intact?
- Is the sender really grounded? Easy check is to measure the resistance to ground on the sender base.
- Measure the resistance between the sender post and ground.
- Measure the G3X input from the sender to ground.
If it worked before I would first make sure the wiring is not the problem. If it has never worked with your G3X, then I would assume the G3X wiring is the problem.
If you do replace the sender, just get the replacement from Van's.
Carl
- Is the sender center wire intact?
- Is the sender really grounded? Easy check is to measure the resistance to ground on the sender base.
- Measure the resistance between the sender post and ground.
- Measure the G3X input from the sender to ground.
If it worked before I would first make sure the wiring is not the problem. If it has never worked with your G3X, then I would assume the G3X wiring is the problem.
If you do replace the sender, just get the replacement from Van's.
Carl
