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frankm(at)clara.net
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 Posted: Sun May 15, 2011 10:10 am Post subject: Faulty fuel gauge |
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I have a capacitance fuel gauge sender in a tube behind the baggage compartment, and a VDO gauge on the panel. For some reason the gauge refuses to read more than about 5/8ths full even when the tank is brimming. I had this fault intermittently last summer, but after about an hour's flying the fault corrected itself and the reading returned to normal. Once the tank really is below 5/8ths full the gauge starts functioning normally right down to empty. The vent appears to be clear and blowing down it makes no difference. It was recently completely emptied when I was replacing a fuel pipe, so there is no foreign substance in the tube. The wiring appears to be sound. It's as though the top part of the probe is inneffective, but as I don't understand these things I would welcome advice. should I pull the capacitance tube apart to look at it?
Frank Mycroft
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budyerly(at)msn.com
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| Posted: Sun May 15, 2011 3:50 pm Post subject: Faulty fuel gauge |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Frank,
I too have had some inconsistencies but mine seems to be a result of differences in fuel. With Mogas (auto 94 octane fuel), My Westach gauge with Princeton 5-S sender was perfect, but when I began using 100LL my fuel gauge has been inconsitent on the low side. I have to recalibrate everytime I switch gas, and with only half a tank it is awful. Luckily the sight gauge works as does the JPI fuel totalizer.
Your system of a tube located behind the baggage compartment is a bit different, and I would check that the tube does not have a bubble in it. In flight, the bubble may become dislodged. Since it is behind the baggage bay, it may not be visible to validate there is no bubble. Also if you have the sensor tube detached from the sender circuit, then the small vent hole in the outer aluminum tube may be leaning against the fuel tube preventing full venting of the capacitance tube. That said, if all is well behind the bulkhead:
Provided you have not been switching fuels, and since the problem is with only the upper end, it does sound like a bad sender. The Princeton, Skysport and Westach probes are not serviceable. They are remove and replace items I am afraid.
Regards,
Bud Yerly
Custom Flight Creations, Inc.
www.customflightcreations.com
(813) 653-4989
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