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Gas Gauge Drop
Joe:
Welcome to the T-Bird forum.
Per your question, I own a 1978 Thunderbird Diamond Jubilee with a 351M (400 Block with 351C Heads) and a 1979 T-Bird with a 302-2v.
My gas gauge in the 79 Bird with the 302 operates normally like other vehicles.
But my Diamond Jubilee (351M) does the same thing as yours: Slow descent of the needle from full to half, and then quick descent from half to empty. I ran out of gas when I first drove the car. So, now, I never let it get past 1/4 tank, especially on the open road.
Don't know why they are different.
Tim
Florida
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