Lotus Elan

Fuel Gauge

PostPost by: mdf » Tue Oct 04, 2016 11:04 pm

I have a fuel gauge that reading very erratically. It was rebuilt last year by Nissongers. I am now on my second sending unit and I get the same erratic readings. The first sending unit was original to the car and the replacement sending unit seems to cause the same problem..

I have grounded the sending units and the gauge. yet the gauge still reads erratically - Any thoughts?

.
-Michael Fatsi
Richmond, Virginia
1963 S1 26/0111
User avatar
mdf
First Gear
First Gear
 
Posts: 43
Joined: 07 Feb 2008
Location: Richmond, Virginia

PostPost by: mbell » Tue Oct 04, 2016 11:38 pm

What's the erratic behavior?

Are you seeing similar behavior on any other instruments? Have replaced the voltage regulator behind the dash at any point?
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
mbell
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1665
Joined: 07 Jun 2013
Location: Austin, TX (UK Ex-pat)

PostPost by: mdf » Wed Oct 05, 2016 2:35 pm

IMy car is an S1 so there is no voltage regulator. The other gauges are fine. Only fuel gauge is wonky, The erratic behavior is sometimes it reads full- even though the tank is not really full. Sometimes it reads accurately. The problem is that the needle just seems to move around randomly..
-Michael Fatsi
Richmond, Virginia
1963 S1 26/0111
User avatar
mdf
First Gear
First Gear
 
Posts: 43
Joined: 07 Feb 2008
Location: Richmond, Virginia

PostPost by: billwill » Wed Oct 05, 2016 2:51 pm

Sounds like there is something wrong inside the display gauge itself. Broken pivot or somesuch.
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4721
Joined: 19 Apr 2008
Location: London UK

PostPost by: EPA » Wed Oct 05, 2016 3:51 pm

If the wire from the gauge to the sender was intermittently shorting to earth it could do this.If you disconnect the wire at the sender end do you ever get a reading on the gauge?
Check that the connection to the sender is not touching the flange of the sender

Ed
User avatar
EPA
Second Gear
Second Gear
 
Posts: 118
Joined: 08 May 2011
Location: Preston

PostPost by: Jon Eckman » Wed Oct 05, 2016 5:24 pm

You might want to check the connection on the gauge too, the one on my S3 was loose causing exactly the same condition.
Jon Eckman
Second Gear
Second Gear
 
Posts: 106
Joined: 23 Sep 2003

PostPost by: Craven » Wed Oct 05, 2016 7:58 pm

Hi,
These old gauges are quite complicated inside, two coils wound with very fine enamelled wire. I have found corrosion at the soldered connections, quite a tricky little job needing a steady hand an eyeglass and tweezers. See if you can get steady reading when the case is tapped using this test method.
http://mgaguru.com/mgtech/electric/fg_10.htm
Ron.
Craven
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1090
Joined: 14 Sep 2013
Location: south coast uk

Total Online:

Users browsing this forum: No registered users and 17 guests