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Rust in the fuel tank, if not removed, can mix with the fuel and cause trouble once it gets into the engine. Fortunately, you can get rid of this problem without having to go through the hassles of bringing your ride to an auto repair shop. In fact, rust elimination is considered as an easy fuel tank repair method that even a novice DIYer can do.
Here are the steps in eliminating any rust build-up in your gas tank:
Step 1: Park your vehicle in a safe working environment. Make sure that the area is well ventilated and free from clutter and flammable substances.
Step 2: Drain the fuel from the tank. To do this, find the drain cork at the bottom of the fuel tank and unscrew it. Wait until all the fuel has flowed out of the tank.
Step 3: Disconnect the fuel lines. Start off by disengaging the supply line, which runs from the bottom of the tank up to the engine. You also need to disconnect the fill tube from the entry point of the fuel. The last one that you need to detach is the vent line.
Step 4: Remove the metal straps. Unscrew the metal straps that secure the fuel tank in place. With a wrench, loosen the nuts and take the tank out of the vehicle.
Step 5: Clean the tank. Before introducing any rust-removal agent, it is wise to remove those chunks of rust first using pressure washer. Pour a mixture of hot water and dish soap inside the fuel tank and let it sit for a while before washing it off.
Step 6: Introduce the acid. Once the tank is clean, put some water and add the muriatic acid. Be careful not to let the acid flow on the tank's outer surface. The ratio of the water and the acid should be 1:1. Allow the water and acid mixture inside the tank for more than half an hour before draining the liquid out.
Step 7: Neutralize the tank. This is done by mixing 1/4 cup of baking soda and 2 gallons of clean water, and then pouring the mixture into the tank. Allow the mixture to rest for a while. Drain, and do the process again for at least 6 more times.
Step 8: Pour isopropyl alcohol into the fuel tank. Fill 70 percent of the tank with isopropyl alcohol and let it sit for 10 minutes. This is to ensure that there's no water left inside the tank.
Step 9: Put gasoline into the tank. Like the alcohol, allow the gasoline to settle for about 10 minutes and discard it properly.
Step 10: Reinstall the fuel tank and reconnect the fuel lines. Put the tank back into its place and secure it with the metal straps. Also make sure that the fuel lines you've disconnected a while ago are properly reconnected before refilling the tank with fuel.