What causes oil leakage from the fuel gun?
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What causes fuel injection nozzles to leak? The nozzle is pressed properly and the fuel pressure isn’t high either, yet there’s still leakage.
What kind of fuel is the poster using? Use the kind of fueling nozzle found at gas stations?
Low vapor pressure for atomization, presence of water, inappropriate oil-to-vapor ratio, coking, nozzle blockage, obstructions in the flame, and so on.