Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Fuel gauge sender/rack

Thanks for the insight Charles. Your explanation makes perfect sense. Unfortunately with my car and seemingly others, the logic that performs this filtering to dampen display is somewhat awry. I get wild fluctuations, premature low readings and often find a particular percentage indication pegged for as many as 20 miles, whilst at other times it drops like a stone.

Whilst the resistor mod has improved the situation to the point I only get a consistent 0% indication above 200 miles from full tank, I have suffered these anomalies before and after fitting.

For these reasons I don't believe the issue can completely be solved by simple sender resistance correction. I believe you alluded to this in an earlier post.

Following a cold start the other day I noted an initial 0% reading (tank 2/3rds full) until system volts rose along with display, suggesting this may be another variable. Normally the indication drops after start consistent with your explanation of filter function.