* Failed Fuel Pressure Regulator (FPR): This is the most common cause. The FPR regulates fuel pressure in the fuel rail. If it fails, it can allow raw fuel to be pushed into the crankcase vacuum system, often through a vacuum line connected to the regulator. This is especially true if the diaphragm inside the FPR is ruptured or damaged.
* Cracked or Leaking Fuel Injectors: A leaky injector can spray fuel directly into the intake manifold, some of which might get past the piston rings and into the crankcase.
* Bad PCV Valve: While the PCV valve is designed to vent crankcase pressure, a malfunctioning (stuck open or closed) or clogged PCV valve could contribute to a build-up of pressure, potentially forcing fuel into the crankcase if there's already some leaking from another source. It's less likely to be the *sole* cause, but it can exacerbate the problem.
* Damaged or Worn Piston Rings: Severely worn piston rings can allow combustion gases (containing fuel) to leak past the pistons into the crankcase. This is more likely to cause a smoky exhaust but can also contribute to fuel in the oil.
* Intake Manifold Leak: A crack or leak in the intake manifold can draw fuel vapors into the crankcase.
* Fuel Pump Issues (less likely): While less common, a very high fuel pressure from a faulty fuel pump *could* contribute to the problem, but this is usually accompanied by other more obvious symptoms.
* Carburetor Issues (if applicable): If your Ranger has a carburetor instead of fuel injection, problems with the carburetor's floats or other components could lead to fuel leaking into the engine. This was less common in 1994, though.
How to Diagnose:
1. Check the oil: The oil will be noticeably thinner and might smell strongly of gasoline.
2. Inspect the Fuel Pressure Regulator: Look for visible cracks or leaks. A pressure test might be necessary to fully evaluate its function.
3. Check the PCV Valve: Ensure it's clean and functioning correctly.
4. Inspect fuel injectors: Look for any signs of leakage. A professional fuel injector cleaning or replacement might be necessary.
5. Look for vacuum leaks: Inspect all vacuum lines for cracks or disconnections.
Important Note: Driving a vehicle with gas in the crankcase can be extremely dangerous. The mixture of oil and gasoline is highly flammable and can lead to catastrophic engine damage or even a fire. Do not drive the vehicle until the problem is diagnosed and fixed. Have a mechanic inspect it if you are not comfortable diagnosing and repairing the issue yourself.
