GMC 2000 Envoy Owner's Manual page 137

Here are four things that some owners ask about.
None of these show a problem with your fuel gage:
D
At the gas station, the gas pump shuts off before
the gage reads F (Full).
D
It takes a little more or less fuel to fill up than the
gage indicated. For example, the gage may have
indicated the tank was half full, but it actually took
a little more or less than half the tank's capacity to
fill the tank.
D
The gage moves a little when you turn a corner or
speed up.
D
The gage doesn't go back to E (Empty) when you
turn off the ignition.
Low Fuel Light
This light comes on when the fuel tank is low on fuel.
To turn it off, add fuel to the fuel tank. See "Fuel"
in the Index.
The LOW FUEL light
will come on briefly
when you are starting
the engine.
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