What Causes Carburetor Oil Leakage?
2 Answers
Carburetor oil leakage can be attributed to the following reasons: 1. The main fuel needle is stuck by foreign objects, causing the fuel level to continuously rise and leak: The needle valve and valve seat control the fuel intake, requiring strict sealing with highly polished contact surfaces. If foreign objects adhere to the contact surfaces of the needle valve and valve seat, it will result in poor sealing and oil leakage. 2. The needle valve is worn and fails to close tightly, leading to leakage: During use, the needle valve is subjected to long-term erosion by impurities in gasoline and wears due to contact with the valve seat. Alternatively, an imbalance in the adjustment of the float at both ends may cause the needle valve to bear lateral force and wear. Wear of the needle valve leads to poor sealing with the valve seat, resulting in oil leakage.
I've seen many cases of carburetor oil seepage, mostly caused by aging or damaged sealing gaskets. Rubber components harden and crack over time, allowing gasoline to leak through the gaps. Another common issue is stuck needle valves or faulty floats - if the float height isn't adjusted properly and the fuel level gets too high, it will overflow. I've repaired several classic cars with this problem; upon disassembly, they were all clogged with oil sludge. Cleaning thoroughly and replacing the seals solved it. Oil seepage is quite dangerous as it may cause fires when the engine gets hot, not to mention wasting fuel and increasing consumption. I recommend regularly checking the carburetor's internal condition to detect and fix issues early before they become serious problems.
