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Hi, The float valve is leaking through. The fuel can leak in the intake and down into the crankcase, where it dilutes the engine oil.
fuel leak on top of what type of engine, gas or diesel?
If you have to pump accelerator alot before it will fire, you have a leak. If you loosen fuel inlet nut after engine is warmed up, you should get a "spray" of fuel, not a dribble. If you have a dribble, this would be a vac leak allowing fuel to drain back to pump.
Where is the leak at? Engine?
have your injectors checked out, it could also be fowled spark plug. --- If the engine stops with a smell of fuel then its likely you have a fuel line leak. What is happening is that the injector has a small reservoir of fuel in it and this starts the engine. Then the fuel pump kicks in as this is used and pumps a bubble of air from the leak up into the injector which stops the engine. The engine stops and any fuel left above the leak falls back down the fuel lead and leaks out the hole which causes the smell of petrol. ---
Where is the leak from? The fuel filler? The fuel tank? A fuel line? Does the leak occur only when the engine is running? Does the leak only occur when the vehicle is parked on an inclined surface?
No, it doesn't. Some vehicles though may have parts of the fuel system so located that a leak can cause diesel to enter the clutch housing anyhow, basically by the fuel dribbling down the side and back of the engine.
Look carefully at the valve cover gasket. They will leak in the back and run down the backside of the engine.
Probably blowing back from the front of the car engine. Either oil leak or power steering leak or trans leak is getting fluid on the tank in rear. No other reason than that.
It is common for the intake to leak engine coolant out of the front and rear corners. You need to check the corners of the intake REAL CLOSE for leaks FIRST, because it will run down the back of the engine and look like it's coming from the transmission bellhousing. If you don't find a intake leak then 1 out of the 2 freeze plugs that's in the back of the engine between the engine and the transmission is leaking. You did not say what year it was, but some of them have a heater hose that connect to a fitting in the rear of the intake can leak too, And run down the back of the engine.
usually there is a fuel leak internally however it can also be an air leak
two things, exhaust has a leak of gases or fuel leak from engine bay