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You need to take the car to an Auto Electrician. This is a clear case of a stripped positive + wire making contact with the body of the car thus shorting out the fuse. Do not attempt to put in a higher amp fuse to try and resolve the matter. The fact that the fuse blows if a safety measure that prevents the car's wiring system from completely burning out. Save yourself this headache and take the car for an electrical system test. Explain to the Auto Electrician that this happens when you put the car in reverse - and he my have to completely rewire the reverse light and reverse switch in the gearbox.
It is electrical, could be initiated by mechanical (shift lever mechanics are pinching a wire in reverse) or a shorted wire or solenoid in the reverse light system or transmission solenoid circuit. Need a detailed wiring diagram to determine path of circuit for that fuse. That is where you need to start. Try your local library or dealer for a service manual. Look Online also.
You may have a shortted injector. Pull all the injector connections off, put a new fuse in. If it still blows the fuse, you must have a short in the injector drive circuit from the ignition switch to the injectors. I don't know what all is in the circuit, but you may have a resistor pack before the current reaches the injectors
If the fuse did not blow, then one at a time, reconnect the injectors. You are looking for a shorted injector that blows the fuse. If the first connection blew the fuse, disconnect that one, put in a new fuse, and start with a different injector connector. You may find one that blows the fuse, meaning it is shorted, and needs replacing. Good luck.
Do you have an aftermarket stereo installed? Well, try this. Remove the ground cable from the battery. Install a new fuse. if it continues, Remove the center console. and check the reverse wire connected to the shifter. It did the same thing to me and all it was, was that wire was touching other wires