Fuel "Control monitor" or "Signal conditioner"

[edasmus]

Any recollection as to the cost of that repair? Thanks!

[JeffAxel]

they do time and materials, so my fix might not be the same as yours. It wasn't unreasonable though.....of course, what is reasonable for me might not be for you!! : )

[edasmus]

Thanks...I'll keep my fingures crossed! Believe it or not, after 20 years of airplane ownership I am rarely taken back by maintenance issues. This is just a crazy expensive hobby and that's all there is to it! Not for the faint of heart, that's for sure.

[edasmus]

Well, the part is getting shipped to Aero-Mach Labs today and it sounds promising. Thanks again and I'll keep everyone posted on the results. I will be out of town for a week or so but I will have updates as they become available.

[edasmus]

Well the signal conditioner was returned from Aero-Mach with apparently several items repaired that were "not per factory specs." The bill from Aero-Mach was $470 plus some shipping charges which seemed reasonable compared to any other options. My shop installed the unit last Friday ($140 to them) and calibrated the unit with the fuel gages. I got in the airplane yesterday (Saturday) and after visually inspecting the fuel tanks and seeing they were full, I turned on the master switch to see the fuel gages indicating EMPTY!!! ( %^&*(#@!$%^&%^$

After engine starts the gages came to life although occasionally still wiggling back and forth until reaching cruise at which they worked fine and indicated correctly as fuel was being used. I suppose something is loose somewhere so we will dig some more and I will share the info as it becomes available.

[Pete Somers]

That sounds good for the repair, but now down to finding out what is really wrong with the system.
Firstly replace the white connector on the signal conditioner.
Check the wing break plugs for any signs of corrosion.

The pins on both of these plugs and sockets suffer from a build up of corrosion and the only way to cure this is to replace them.

The plug and socket on the back of the instrument cluster again suffers from the above and needs to be cleaned.

The fuel indicating system on the 337G - H requires some looking after and any corrosion etc will deem the system useless.

Did your shop use a capacitance test box to calibrate the system??

Good luck
Pete

[Ernie Martin]

There's another thread on this with lots of info. I've checked everything and still get erratic readings. The signal level, especially at smaller fuel loads, is quite small, so any corrosion or other impedance screws up the reading. I've given up, take the readings when they're there (I never get a positive but inaccurate reading -- it's either correct or zero) and never take off without visual confirmation of fuel in the tanks.

Ernie