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#1
04-22-2010, 06:03 PM
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Fuel in intake manifold
Is it normal to have fuel in the intake manifold? The fuel injectors inject fuel into the cylinders and they are at the end of the tubes of the intake manifold. Why would fuel be in the intake manifold itself? This is just be a stupid question but I just wanna double check and make sure thats normal. When I opened the valve I could see that it is very greasy in there and I could smell fuel.
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Michael Glisson - Semper Fidelis 
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#2
04-22-2010, 07:12 PM
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Re: Fuel in intake manifold
You get leftover fuel vapor in the intake. Over time it dries out and leaves behind a goo/gunk that is tan to black. Not to mention the oil vapor the PCV system deposits in there also. Year/make/model?
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#3
04-22-2010, 07:30 PM
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Re: Fuel in intake manifold
Quote:
__________________
Michael Glisson - Semper Fidelis
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#4
04-22-2010, 08:16 PM
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Re: Fuel in intake manifold
Not it's not normal. Maybe a problem with the PCV valve, not sure.
__________________
2003 Chevrolet Impala LS 3.8L OHV 2002 Ford Taurus SE 3.0L OHV (sold) 1998 Ford Windstar LX 3.8L OHV (sold) 2002 Chevrolet Malibu LS 3.1L OHV (sold) 2004 Hyundai Accent GS 1.6L DOHC manual (sold) 1995 Oldsmobile Cutlass Supreme S 3.1L OHV (sold) 2002 Ford Crown Victoria Police Interceptor 4.6L SOHC (sold) A Windstar without having the check engine light is not a real Windstar. 
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#5
04-23-2010, 01:51 AM
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Re: Fuel in intake manifold
A moderate amount is normal, if the intake sits lower than the ports in the head. It will puddle up a bit. Excessive amounts aren't good as it can suck into the cylinders and hydrolock the engine. Why did you have the intake off?
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#6
04-23-2010, 07:42 AM
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Re: Fuel in intake manifold
Like RahX said above, I would agree that some film in the intake is not uncommon. Mostly what I've seen I would attribute to vapors from the PCV system doing its job, and I suspect if the vehicle sees a lot of in-town driving and not so much highway driving it may never burn itself clean. What I've experienced I would agree has a petroleum smell, I'm not sure sure I'd pin it as a fuel smell, although there is a hint of fuel odor to it.
Keep in mind that if it's truly just fuel vapors it would have evaporated in the time the intake manifold was removed from the engine and sitting on the garage floor/work bench. I would suspect the majority of what you are seeing/smelling is oil from the PCV system. -Rod
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