Most fuel tanks require a two pronged fork of treatment.
Treating rust in a motorcycle fuel tank.
Drain the fuel completely and allow the tank to air dry.
A rusty motorcycle petrol tank can corrode to the point that you get holes in it.
Dump the phosphoric acid out.
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How to remove rust from a gas tank with the works cleaner.
Anyone from used motorcycles riders to classic car owners to boat enthusiasts can wind up with rust in their fuel system so the key is mitigating the damage as soon as possible.
Place moisture absorbing silica packets into the fuel tank and seal the tank completely.
You can finish the job by coating the tank with a plastic sealant like kreme or if it was just surface rust simply put it back in service.
Add 711 to 948 ml 3 to 4 cups of phosphoric acid to the tank and shake the tank to coat the inside walls.
The first prong deals with removing the heaviest rust deposits and the second involves rejuvenating the finish possibly in preparation for the installation of a tank sealer.
Remove the fuel tank completely if the motorcycle will be stored for long periods of time.
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Whatever you do i d recommend replacing the fuel filter or adding one if none is present to catch errant rust particles before putting the bike back on the road.
This method of how to clean a gas tank significantly better and more cost effective than any other.
As a sealant red kote excels at sealing the often hundreds of pin hole leaks that occur along seams or where straps wrap around the tank.
The best solution to rust in the gas tank is to use one of the below methods to clean it out then use a sealant or begin using fuel additives to prevent future recurrences.