1991 geo tracker doesn't usually start in colder weather.

[fixkick]

are you cheating?,let me explain.
where is the meter negative lead, when testing
answer connected to the pump wire. minus.
not to the car body or it lies to you.
the tank is still on the ground.
so put the meter on the pump 1 wire connections, 12vdc will be there. (both meter leads on the 2 pump leads at the pump)
if the pump is dead, 12vdc will be on the pump.
trust the meter,

the pumps hot wire goes to the fuel pump relay.
the pumps neg lead goes to ground. and both wires can fail. (means wires and every connector on both lines can and do fail.)
the motor is a 4 amp load, if there is resistance in the line it will fail.
with only 3 ohms resistance in the 2 lines, (power feed) the pump runs at 1/2 speed
with 6 ohms 1/3rd speed.(4vdc at pump)
as you can see it dont take much bad resistance in the lines to make any pump fail.