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When your injectors get dirty with gum buildup. You can tell this by removing the injector and watching the spray pattern as you collect it in a large jar or bucket. CAREFULLY! The fuel mist is incredibly flammable.

A clean injector creates a uniform mist, a dirty one creates a more unstable pattern with larger drops.

The fluid contains detergents and solvents to re-dissolve the gunk and remove it.

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Q: When Do you use Fuel Injector Fluid?
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