It was not in my owner's manual.

I want to know the reserve fuel capacity.
And, it will show up the warning sign as the fuel getting empty?

The 91 Sunbird has a 13.6 gallon gas tank.

I see no mention in the 91 Pontiac Dealers Sales Catalogue or in the
Consumer Guide Auto' 91 that a 2.0 litre Sunbird was equipped with a Low
Fuel Warninig Light.

Typically cars that are equipped with Low Fuel Warning Lights, the light
come on or maybe flashes or might even go ding, ding, ding every 60
seconds when there is five to three gallons remaining.

=========
Harryface
=========

1991 Pontiac Bonneville LE
3800 V6 ( C ), Black/Slate Grey
_~_~_~296,339 miles_~_~_

~_~_~_~_U.S.A._~_~_~_~_~_

~~~The Former Fleet ~~~
89 Cavalier Z 24 convertible
78 Holiday 88 coupe
68 LeSabre convertible
73 Impala sedan