Inboard Tank fuel sending unit gasket replacement G model
 

I am in the middle of replacing the fuel sending units cork gaskets, how difficult is the removal and installation of the tubular capacitors in the inboard tank? Any help would be appreciated.

Are you referring to the main fuel inter-connects ? Rubber couplers?

1973 G model type fuel quanity sending unit
 

Once you remove the bolts from the top of the tanks for the fuel sending units, two wires are attached to a tubular capacitor that sits upright in the tank and measures dielectric values in relationship to the fuel level. That was a mouthful, the tubes are upright in a cradle, just wondering how difficult were they to remove. Can't get the new gasket on without having them out of the tank. Thanks for responding.

They are installed in clips, pull the bottom of the capacitance tube forward towards the front engine and they will pop out of the clips. Make sure on reinstallation that they are oriented correctly, push back in the clips and they will snap in place.

N67S
Dan Schultz

Hi Chaps

Apologies for the basic question, are the tubes marked with an up so that it can assist with installation or is it as simple as wires to the top.

Regards
Dave

Capacitance Tube Orientation
 

The orientation of the tubes were with the white plastic insulator on the bottom.

I'm going to pull mine in the next week for a CIES update, I'll take pics if you still need them. They are very easy to remove and generally easy to put back in.

Let me know how that CiES install goes. Mine was a bear and I have a blank spot between 35-50 gal per wing. Talked to CiES at AEA last week and think I can reorient my inboard sender to eliminate the irritating lack of fidelity between 35-50 gals.

‘77 NA G model with long range tanks (150 gal).

Will do! I’m doing my 73G and my brother is doing the family 69D so we will have a few good datapoints.

What is the orientation recommendation from cies?
Can sensors be installed without removing upper wing panels?
This is a near future project for me.

For my 337G i’ll have to pull the wing panels since the access doors aren’t large enough to pass through the large flange. On pre 73 models (verified for 69) the resistive senders are smaller and can be pulled without removing the panels.

As for orientation, tbd.

On mine, I also pulled the wing panels. Not fun. Recommend supporting the booms and wing with jackstands. On my inboard tank, the forward access port (of three in the inboard tank) was the desired location for the sender. My tanks had baffles that precluded installing the CiES sender in the forward port….so I put them in the middle port, angled the float towards the fuel drains.

My problem is, my inboard sender tops out before fuel floats the outboard sender.

Im considering pulling the damn panels again, cut the baffle, and install the sender in the forward port to get more “up” float travel on the inboard sender so the outboard sender will float before the inboard sender hits the top of the tank.

Good luck with y’all’s installs!

Also…pro tip: power the CiES senders from ships power, not the gea24, and run both sets of sender signal wires to one gea24. Make sure you get gi275 software version 2.42 or 2.43.