Quick Answer
Work in a well-ventilated area without ignition sources. Remove the carburetor and extract the gummed jet. Soak the jet in carburetor cleaner, then clear passages using soft copper wire or nylon bristles to avoid enlarging the orifice. Blow dry with compressed air. Reassemble and replace stale fuel with fresh fuel.
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Cons
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A gummed carburetor jet is one of the most common causes of hard starting, surging, and stalling in small engines, generators, mowers, motorcycles, and marine auxiliaries that sit idle between seasons. The failure is a metering problem. Jet orifices are small, typically 0.30 to 0.60 mm for pilot (slow) jets and 0.70 to 1.40 mm for main jets on small utility engines. Deposits only a few hundredths of a millimeter thick can therefore change fuel flow by a significant percentage. This guide covers the chemistry of the failure, a disciplined cleaning procedure, the safety controls for handling gasoline, and the reassembly errors that cause repeat failures.
Why Stale Fuel Gums Jets
Gasoline is a blend of hydrocarbons that includes unsaturated compounds such as olefins and diolefins. When exposed to oxygen, heat, and trace metals (copper and brass in the carburetor body act as oxidation catalysts), these compounds undergo free-radical oxidation and polymerization. The products are soluble gums that stay in solution at first. As the lighter fractions evaporate, the gums concentrate and precipitate as amber to dark brown varnish. Industry fuel specifications such as ASTM D381 limit existing gum in finished gasoline to 5 mg per 100 mL at the point of manufacture. Fuel left in a float bowl can exceed that concentration many times over once evaporation has removed the volatile fraction.
Ethanol blends add a second mechanism. E10 gasoline is hygroscopic and can hold only about 0.5% water by volume before phase separation. Beyond that threshold, a water-ethanol layer settles to the bottom of the tank and float bowl, which is exactly where the main jet draws fuel. This layer has poor combustion characteristics, promotes white and green corrosion on aluminum and zinc alloys, and leaves a crusty residue when it evaporates. Ethanol is also a strong solvent. It can loosen tank and hose deposits and carry them into the carburetor, where they lodge in jet orifices and emulsion tube holes.
The pilot circuit fails first because its passages are the smallest and its flow is the lowest, so a deposit of a given thickness blocks a larger fraction of the cross-section. Common diagnostic signatures include:
- Pilot jet restriction: The engine will not idle, stalls when the choke is opened, or runs only with partial choke applied. Mixture screw adjustments have little or no effect.
- Main jet restriction: The engine starts and idles but bogs or surges at wide-open throttle and under load. Exhaust and spark plug color trend lean (light gray or white insulator).
- Float needle or bowl contamination: Fuel overflows from the bowl vent or overflow tube, or the bowl runs dry, depending on whether the needle sticks open or closed.
- Varnish on the fuel shutoff or tank filter: Flow rates drop below the engine’s demand at high load, which produces symptoms similar to a restricted main jet.
Before disassembly, verify that the problem is fuel metering and not ignition or compression. Confirm spark at the plug with a gap-type tester (a healthy small-engine magneto delivers roughly 15 to 25 kV at cranking speed) and confirm that the fuel in the tank is not visibly dark, cloudy, or varnish-smelling. Fuel that smells sour or like paint thinner has oxidized and should be replaced regardless of the carburetor’s condition.
