92 geo tracker keeps blowing fuel fuse 15 amp but when I go to a 20 amp it is fine gas tank is haff full of fuel what is my problem

First off each fuse has a name , so what is the correct name, the 92
has 3 EFI fuses, DOME (memory) IG-Coil (ecu and spark) and "FI"
never up the amps ever or burn the wires up. sorry but that is a FACT. the a above data is wrong, this cars pump draws 4amps.
if more its bad, sure if over 15 it blows, but is a bad pump.
all pumps like to do that, they burn up and suck power, like a piggy.
see your fuse here, linked,
this car and ECU nor know for shorted pumps and shorted ECU
the 92 uses these JUNK brand caps, large electrolytic caps.
and they love to short, on all 89 to 95 trackers and sidekicks in usa.
they are marked Rubycon.

so again which fuse?
ill pretend its FI blown

http://www.fixkick.com/power-elect/blows-fuse.html#FI_blows

FI is bottom right, lost the cover? now you have one.
http://www.fixkick.com/Elect-fail-index.html

is engine 8 valve or 16?, they have different EFI , systems.
Im sure its FI, as it runs ECU and pump. so..... and they love to blow.


ok i throw dice for you, land on 8v.
see 8v FI fuse here?
http://www.fixkick.com/ECU/8v-tbi-schematic91to95.jpg

what i do is remove the left rear tail light,lens.
then see the pink pump wires, I measure the pump current
i reads 4 amps, with helper keying on over and over.
see?
now if near 4amps, then the ECU is shortings it CORNER cap.
http://www.fixkick.com/ECU/ECU.html

the caps dry out,inside, leak acid , wreck copper traces
and then the cap shorts, some times , it loves to short on speed bumps. due to vibration, its just a bad 50 cent part
that any tech can change or any HAM radio guy, etc.
with simple soldering tools and skills
do tell engine type G16a or b (a= 8v, and b = 16v) and we can
point to exact part bad.

So your fuel pump is pulling more than 15 amps but less than 20. Good news is you dont have a short. You may have wiring issue, as in corrosion in a connector and corroded ground wire connection. Or it may be that the fuel pump is getting wore out and just pulling a little more than it should. I would check the ground wire connection to the frame.