Here's why:
* Fuel and oil systems are separate: The fuel pump sits within the fuel system, which is separate from the engine's lubrication system (where the oil circulates).
* Mechanical fuel pump function: The mechanical fuel pump is responsible for drawing fuel from the tank and pushing it to the engine. It's not involved in oil circulation.
However, there are indirect ways a faulty fuel pump *could* lead to contamination:
* Fuel leaks: If the fuel pump malfunctions and leaks fuel, this fuel could potentially drip onto engine components, including the oil pan. While unlikely to directly enter the oil, it could contaminate the oil pan area and lead to issues like a burning smell or even a fire hazard.
* Fuel pressure issues: A faulty pump can cause fuel pressure problems. This can lead to an overly rich fuel mixture in the engine, causing excessive fuel to enter the combustion chamber. Some of this fuel could end up in the oil pan due to blow-by, where combustion gases escape past the piston rings. This can contaminate the oil and lead to problems like sludge buildup.
In short: While a faulty fuel pump doesn't directly contaminate engine oil, it can lead to indirect contamination due to leaks or fuel pressure issues.
