I should have read my manuals before posting.
Smiths fuel gauges came in two styles. The early style (with prefix FG or X) was used until some time in '68. This was an instant reading type, with calibration screws and did not use the voltage regulator. The Elan used FG2530/71 until March '68. The corresponding sender was FT3334/00 until July '65 and FT3334/50 from Aug '65 til Mar '68.
The later style (with prefix BF) was used after about late '67. This had a damped movement and used the voltage stabilizer. The calibration holes were sealed off.
The Elan used BF2201/19 from after about Apr '68 with corresponding sender TB1114/023 from about Apr '68 until Apr '70 and TBS1114/010 from about May '70.
The +2 used gauge BF2201/13 for all years Oct '67 on with corresponding sender TBS1214/004. The +2S used gauge BF2209/01 From Nov '68 with corresponding sender TBS1214/004.
Reading the posts, it seems that many people find the low reading acceptable. If the reading does not go down to "E", it may be possible to bend the float arm to "calibrate" the gauge. Not reading "F" is probably a problem with fuel tank venting. All this assumes the wiring is good. Corrosion may affect either the reading or calibration.
http://www.google.com/search?hl=en&safe ... f&oq=&aqi=should point to others with the problem and possible corrective actions. On my Elan, I would park with the nose up if possible, fill till the hose clicked off, then bounce the car, fill some more, bounce again, and then carefully fill until the gas level reached just below the gas cap. Then the tank was completely full and I could get over 400 miles/tank. Conversely, on my MB 280SEL, I parked nose down for the same effect. On a +2, it takes more time to do this unless you tilt the car sideways or fix the venting.
David
1968 36/7988