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Old 25-06-2009, 22:39   #1
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Question Fuel in Oil Pan 3gm30f?

Hello

In what other way can I get fuel in the oil other than through the rings?
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Old 26-06-2009, 00:22   #2
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Hi,

You might see fuel mixed with oil in the oil pan if the gasket under the bleed screw on the bottom of the diesel water trap is leaking. It tends to drip into the oil pan.
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Old 26-06-2009, 00:52   #3
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Do you see it or do you only smell it?
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Old 26-06-2009, 00:58   #4
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[Do you see it or do you only smell it?]

I get raised oil level in the pan and it is definetly not water. It also makes the oil thinner. So the only thing I could think of is diesel.
Can it come from the feeder pump into the pan if there is a leak?
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Old 26-06-2009, 01:09   #5
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Quote:
Originally Posted by Örjan View Post
[Do you see it or do you only smell it?]

I get raised oil level in the pan and it is definetly not water. It also makes the oil thinner. So the only thing I could think of is diesel.
Can it come from the feeder pump into the pan if there is a leak?
I'm trying to remember what the engine looks like, but I don't think it should be possible for diesel to get in there from the pump. How is the engine running? Running on all cyliners? Lots of white-greyish smoke? Is your return line for the diesel ok?

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Old 26-06-2009, 03:24   #6
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Hi,

By "Pan" do you mean sump and not well. There should never be any oil in the well under the motor unless something is leaking.
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Old 26-06-2009, 03:32   #7
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Taffy .

Yes I mean the sump.
I totally agree that there should be no oil under the engine.
I get fuel in the oil sump that then comes out through the breather and creates a huge cloud of smoke.
So I need to find the leak.
It runs fine otherwise.
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Old 26-06-2009, 03:36   #8
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So I have to empty a lot out and refill with some new oil t o right level.
I do not want the engine to be lubricated with diesel. It should run on it.....

So I will look at the feeder pump. Then if that is ok the only thing I can think of is the high pressure pump...

Any thaughts ?..
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Old 26-06-2009, 04:26   #9
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Hi,

Is your fule return pipe blocked or the rubber hose back to the fule tank damaged ?
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Old 26-06-2009, 04:45   #10
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Mechanical or Electrical Fuel pump?

Steve
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Old 26-06-2009, 04:58   #11
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Hi,

Is your fule return pipe blocked or the rubber hose back to the fule tank damaged ?

Not to my knowledge but I will have an extra check.
How would this effect the situation?
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Old 26-06-2009, 05:02   #12
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Mechanical or Electrical Fuel pump?

Steve
Both the feeder pump and the high pressure pump are mechanical with some connection to the engine (getting the movement for the pump of the cam or crank shaft).
So my thought was if the pump/s is leeking it will run into the sump.
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Old 26-06-2009, 05:04   #13
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Hi,

There are not many parts in the fuel system and these are the last in the chain. I was thinking that the unused fuel is not getting back to the tank.

How about the fact that the fuel injectors must be within 3% of each other. If over 3% the engine output will drop and/or one cyliner will overheat. There is an injector volume adjustment plate on the side of the pump body.

Or one of your injection nozzels is sticking/ not fully closing.
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Old 26-06-2009, 05:11   #14
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I'd bet a bucket of donuts that one of the pumps diaphragms has ruptured and fuel is leaking at the cam pump. I had a gas engine once rupture. I didn't notice until the motor started knocking because the fuel had thinned the oil. Thought I was out of oil so checked the dipstick and it appeared low. Added 2 quarts and it didn't show on the stick. Added another quart and still didn't register. That's when I noticed the smell of gas on the stick. Pulled the drain plug and dumped 6 quarts of oil and probably a gallon of gas. A mechanic told me he saw a motor with the pan blown off because of fuel in the pan had ignited. Pull the pumps and check the diaphragms, normally not repairable.

Hope that does it.
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Old 26-06-2009, 05:19   #15
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I'd bet a bucket of donuts that one of the pumps diaphragms has ruptured and fuel is leaking at the cam pump. I had a gas engine once rupture. I didn't notice until the motor started knocking because the fuel had thinned the oil. Thought I was out of oil so checked the dipstick and it appeared low. Added 2 quarts and it didn't show on the stick. Added another quart and still didn't register. That's when I noticed the smell of gas on the stick. Pulled the drain plug and dumped 6 quarts of oil and probably a gallon of gas. A mechanic told me he saw a motor with the pan blown off because of fuel in the pan had ignited. Pull the pumps and check the diaphragms, normally not repairable.

Hope that does it.
Steve
Thanks . this confirms my thaughts.... I will puull the feederpump first and see if that is the problem .
Then the highpressure pump will be the last resort.....
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