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Old 07-21-2013, 12:18 PM
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Gasoline getting into oil

I just bought 1979 Z28 in feb and changed the oil. The oil smelled of rancid gasoline. I had to set the choke and idle mixture on the AFB 625 as they were both way way off. I just checked the oil after a couple of hundred miles and its smelling like gas again. I just changed the oil once again but not sure why this is happening. I did a compression reading on all cylinders and they range between 155:170 psi.The fuel pump is mounted by tank (External). I just installed a carter p4070 rated at 4-6 psi / 72 gph in june 2013. Less than 200 miles on pump. I took the temp off the headers and all seem close.
#1-250*
#2-248*
#3-267*
#4-289*
#5-261*
#6-309*
#7-246*
#8-262*
If anything #4 and #6 seem to be a bit higher than the rest of the grouping. In march i put in new plugs as the old ones were a bit fouled(who knows how old those plugs were).
I guess the next step would be a leak down?????
When i do the leak down do i need to bring up the motor to normal operating temp? If so i think ill need to get a bottle of burn cream
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Old 07-21-2013, 12:48 PM
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Did you look inside your carb to see if it's leaking down ???
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Old 07-21-2013, 01:22 PM
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No i didn't look in the carb, Is this with the car running or off?
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Old 07-21-2013, 01:29 PM
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With the engine not running, have someone turn on the switch, but not start the engine. That will turn on the fuel pump, which will build pressure, look into the carb and see if any fuel is going into the engine. You could also run the engine for a minute, then cut it off and look into the carb to see if any fuel is going in after shut down. What New Interior is getting at is the fuel pump may be building enough pressure to cause the carb to put raw fuel into the not running engine, thus washing fuel down the cylinders into the oil.

Kelly
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Old 07-21-2013, 06:07 PM
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If the car has a mechanical pump. The diaphram is ruptured and leaking fuel into the oil.. Bought an old Chevy van once that had oil/gasoline running out of the dip stick and valve covers.
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Old 07-21-2013, 07:12 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com View Post
If the car has a mechanical pump. The diaphram is ruptured and leaking fuel into the oil.. Bought an old Chevy van once that had oil/gasoline running out of the dip stick and valve covers.

This is a common problem. If its been happening for a while you might have washed out your lower end bearings.
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Old 07-21-2013, 07:16 PM
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He said the fuel pump is mounted at the tank..(External).


Yes.. you should check it after you have stopped it... Does it seem a little hard to turn over after it's been sitting for a while ???
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Old 07-21-2013, 07:21 PM
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I made the suggestion because back in my day. Many guys installed the external tank pump and still ran thru the mechanical pump. Some drag race classes required it.
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Old 07-21-2013, 07:38 PM
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It starts right up, each and every time cold or hot
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Old 07-21-2013, 08:26 PM
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If the carb isn't leaking down then you should run a compression check as if it's not the mechanical fuel pump since your not using one and if the carbs not leaking down then the only thing it leaves is a piston has a hole in it. A compression test will find it for you.
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Old 07-21-2013, 08:53 PM
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He did a compression test - said they all came in between 155 and 170psi.
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Old 07-21-2013, 09:25 PM
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Any safety nazi here read this disclaimer. Kids do not try this.
For the rest of that can make a peanut butter sandwich without getting hurt. Drain the oil and put about a pint of it in a metal can. Strike a paper match and toss it in the can. If you can light the oil with a paper it has raw gas getting in the oil. If it doesn't light your carb is probably just rich.
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Old 07-22-2013, 09:06 AM
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I took a soda bottle cap and filled it with the oil and tried to light with wooden match. Wouldn't light. I will check the carb today and tomorrow i will start to do leak down tests. Can i just warm engine up for leak down or does it need to be normal operating temp. Just want to minimize me burning myself.
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Old 07-22-2013, 01:53 PM
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Sounds like you have eiyher float to high or needle not seating proper..possible caused by to much fuel pressure do you have a regulator in return line.

also the temp variance in 4&6 as compared to the rest sounds like a small intake gasket leak,,the leak would be like comparing a torch when you have to much gas it does not get hot enough just more smoke but when you ad OX such as an vacmn leak it gets hotter

The gas in the oil needs an immediate fix,bad for bearings
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Old 07-25-2013, 02:42 PM
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Checked carb, I don't see anything draining into the carb. However at some point the car did have a regulator that someone removed. I ordered one up to see if this will help. 5 psi with the AFB 9625??
I did see fuel by the secondaries as shown in the photo.
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