Plastic fuel tanks should be cleaned out once every couple of years or whenever you empty them for storage. As the fuel in a plastic tank slowly evaporates, it leaves behind a varnish coating in the bottom of the tank. As this varnish collects, and dirt and debris from the engine accumulate on the interior, the tank can develop solid deposits. If not cleaned away, these small solid deposits can be reintroduced into the engine, causing trouble.
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Things you need
- Parts cleaner solvent
Disconnect the fuel tank from the engine and empty it.
Pour a handful of BBs into the tank.
Fill the fuel tank 1/4 of the way with a parts cleaner solvent.
Place the cap on the fuel tank. Shake the fuel tank vigorously, in all directions, for 30 to 60 seconds.
Empty the solvent and BBs over a mesh screen. Rinse the BBs and store them for use next time.
Fill the tank 1/4 of the way with fresh parts cleaner solvent. Shake the fuel tank vigorously, in all directions, for 30 to 60 seconds. Repeat two to three more times.
Store the fuel tank or fill it with fresh fuel.
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