Same prob here. '88 EA GL. Gauge was 1 small notch past 1/4 of a tank and i put in 67 litres. Have done this figure more than once. Also gauge seems to sit on full approx the first 200km and then slowly drop. As it gets nearer to 'empty' it drops faster, finally taking approx 67 litres at 1 small notch beliw 1/4. Im not game to keep going and see if its actuarly empty or holds more fuel that im lead to believe an EA does.
Simple Simon met a Pieman, going to the fair. Said Simple Simon to the Pieman, What have you got there? Said the Pieman unto Simon, Pies, you dickhead