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Old 10-11-2006, 01:36 PM
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fuel in engine oil

Hello All,
I'm not really new, It has just been a very long time since I've been able to post anything.
I was changing my engine oil out today on my 454 and notice a faint smell of fuel and the oil seemed a little thinner then normal. The color seemed normal just thinner.
I also noticed that if you're stopped or in park and rev up the engine 3-4,000 rpms and then get off the gas a small amount of white to grayish smoke comes out of drivers side tail pipe and then after a few seconds it clears up. I don't notice it smoking any other time.
I wasn't really sure were to start on trouble shooting.
Is it strickly to much fuel and it's getting by the rings or is it worse and the rings are bad. The engine has about 2000 miles on it and hopefully that's not an issue here.

Thank you all very much for your responses,
66Thom

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Old 10-11-2006, 01:50 PM
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Well....If it were too much fuel or running rich...it should be showing on both sides not just one. The fact that it only does it on one side is a good indication that you possibly have a ring problem on that side...the rings could just be stuck. What I think I would do would be to go to the parts house and get some ring free...only mix one ounce per 10 gallons of gas..do not mix it any more than that. Then run the snot out of it and see if it gets better.
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Old 10-11-2006, 02:10 PM
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Fuel dilution of the oil is usually caused by a leaky carb. Often times the carb will percolate after shut down if its hot, spilling a small amount of fuel into the intake and then running into one or more cylinders, then slowly pass the rings and into the oil. Could also be a soggy float or leaking primary metering wells in the carb itself.

Mark
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Old 10-11-2006, 02:19 PM
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After you check the carb to make sure it's ok, you might pull your fuel pump. If it has a pin hole in the diaphram, it's letting gas by into the crankcase. If it's leaking by a lot, it'll raise the oil level which is a good indication the pump is bad. If it's not leaking very much, the gas can have enough time to 'flash' off from the heat within the crankcase and not raise the level.
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Old 10-11-2006, 02:24 PM
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this may not be your problem...
said to have 3500 on this one!
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Old 10-11-2006, 03:05 PM
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Thank you guys for the help. I think its float related when we first started the truck up the float stuck on us and it's an edelbroch carb, which I've been told has issues with sticking floats.
Hopefully it's as simple as that.
hOtrod389, not really sure what you're trying to show me other then a cylinder wall.

Regards,
66Thom
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Old 10-11-2006, 05:10 PM
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a cylinder wall that had been imprinted with a wrist pin... see the scars?
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Old 10-11-2006, 09:08 PM
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had same problem with 67 camaro

I had the same problem with the oil in my car. I checked the oil one day and noticed it was very thin and also smelled like fuel. What I found out was the carb was still dumping fuel after the car was shut off. Though I just bought this 750 dp holley I ended up calling where I bought it and they said they would exchange it for another one. They said it sounded like the floats were screwed up or needle seats. I replaced it and no more fuel in oil. Check the carb as soon as you shut the car off and see if it is trickling gas down the bowls.
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Old 10-11-2006, 10:55 PM
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As far as the smoke it may or may not be caused by the same problem. White smoke is usually oil. But I agree that the carb is the most likely cause of the fuel in th oil.
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Old 10-11-2006, 11:22 PM
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what type of intake? airgaps are notorious for pooling fuel. Does it sit and idle more than usual?
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Old 10-11-2006, 11:29 PM
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Doc here,

White smoke/mist out the rear is water...Blue Or Gray is oil...

If you are getting blue or gray, and the smell of fuel in the oil, check the fuel pump..IT may have a hole in the diaphragm small enough to leak fuel into the crankcase and enough to suck back oil..(ERGO, smoke..).

The second cause could be bad valve seals/guides dried or cracked rubber seals..allowing both fuel and oil to mix..

The only way to determine FOR sure..is pull and inspect the plugs.. What color are they:?
  • Brown = Normal,
  • White with metal flecks = lean/detonation,
  • Sooty Black = Rich mixture,
  • Glazed Black = Oil burning..

Then Do a Compression test..stock, should run about 125 to 150 PSI + / - 10 % to be in the good range with a few miles on it..Low holes could indicate broken or cracked rings, froze rings , runout scoring...

Then do a Vacuum test, it should read at Idle, Warm full open choke, on a MANIFOLD source, 17 to 21 In Hg..and Steady..no fluctuations unless you have a wicked lumpy cam..If the gauge is all over the map..you have valve train problems..Guides, Seals, mal~Adjustment, burned valves..

Next Do a Pressure / Volume test on the fuel pump..if it is LOW..you probably have a Leakey diaphragm..

That should get you started..

Doc
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Old 10-12-2006, 12:03 AM
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Fuel in oil

When I was drag racing [409 chev/ 2x4 ] I noticed some problems ,changed oil offen . Sure did suck gas in 1/4 mile !!!
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