Cessna 172P fuel gauge problem

Cessna 172P fuel gauge problem

For the past year fuel gauges are pinned to above full and occasionally randomly give me a correct reading. Last week my mechanic and I took out sending units and operated the float out of the plane and gauges gave correct readings. We then placed them back in tanks, cleaned the metal ground tab well, sprayed with conductive lube and again they worked 15 minutes until I turned engine on, now they are pinned to full again. Check all wires, no cracks or bare spots. My question is the grounding tab. Is it supposed to contact something under the wing skin to make a good ground? I can't see under the wing skin through the hole, just no space. Curious why no grounding wire. If I connect a jumper wire from one of the sending unit screws to ground they work again. My mechanic and I are puzzled, any ideas? I am new to this forum. Also appreciate any suggestions for other good Cessna 172 technical forums!
Robert

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: Cessna 172P fuel gauge problem

THe grounding tab, a "U" shaped piece of thin metal, should be under the xmtr gasket, touching the fuel tank, and under the screw touching the xmtr. I have constantly seen these tabs installed incorrectly or omitted.

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Board Info

Board Stats:
 
Total Topics:
6045
Total Polls:
1
Total Posts:
16355
Total Posts Today:
1
User Info:
 
Total Users:
2540
Newest User:
kleinjl@comcast.net
Members Online:
0
Guests Online:
1823

Online: 
There are no members online

Forum Legend:

 Topic
 New
 Locked
 Sticky
 Active
 New/Active
 New/Locked
 New Sticky
 Locked/Active
 Active/Sticky
 Sticky/Locked
 Sticky/Active/Locked

ankara escort ankara rus escort ankara escort bayan ankara bayan partner ankara escort kizlar escort ankara ankara escort ankara eskort ankara escort bayan ankara bayan partner ankara escort kizlar escort ankara