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Fuel Flo Problem

Postby JimB » Mon Sep 04, 2017 12:38 pm

I have an EIS feeding my Sport HS displays.

The engine is a Rotax 914 so I have two Floscan transducers. It has worked fine for years. I just did 100 hr maintain on engine and wiggled some wires near the Floscans. Test flight after was normal but next flight had low fuel flow. When I looked at the DEMO file, the FF was jumping around, suggesting a bad connection. But I can't seem to find anything wrong. With engine not running FF show 0 as expected.

what should I see if I disconnect the signal from first the return Floscan and then the supply Floscan?

Any other troubleshooting ideas?

Thanks.

Jim Butcher
JimB
 
Posts: 76
Joined: Tue Mar 12, 2013 12:52 am

Re: Fuel Flo Problem

Postby JimB » Tue Sep 12, 2017 3:09 pm

An update. I found that when I disconnected the return Floscan sensor, the EIS fuel flow was about what I expected, 40 GPH. When I had the supply Floscan disconnected and the return Floscan connected, the EIS fuel flow showed 0.

The problem eventually turned out to be a loose connection on the dSub feeding the EIS.

Jim Butcher
JimB
 
Posts: 76
Joined: Tue Mar 12, 2013 12:52 am

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