7.3 crankcase full of diesel fuel....help!! - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 11-18-2019, 05:26 PM Thread Starter
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Thumbs down 7.3 crankcase full of diesel fuel....help!!

new here couldnt find exact place to post but......I have 2001 7.3 211,000 miles stock.....yesterday driving 70 mph 8ft flames and oil shot out exhaust smoked up the entire 4 lane freeway.....checked oil it is way way overfull and will not start....any ideas.....i did here a very loud pop under the hood when it happened
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post #2 of 13 (permalink) Old 11-18-2019, 06:02 PM
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Re: 7.3 crankcase full of diesel fuel....help!!

It's been awhile but only place diesel would contact oil would be bad injector o rings I believe. Again it's been awhile but that's what I would suspect that. Also probably why it wont start the diesel isnt getting compressed as much as the high pressure oil to start it. Maybe?

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post #3 of 13 (permalink) Old 11-18-2019, 06:19 PM Thread Starter
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Re: 7.3 crankcase full of diesel fuel....help!!

thanks will try look at injectors soon and hopefully get few more ideas from others
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post #4 of 13 (permalink) Old 11-18-2019, 08:48 PM
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Re: 7.3 crankcase full of diesel fuel....help!!

If it's o-rings, you should be getting oil in the fuel, not fuel in the oil. The oil pressure is higher than fuel pressure. I'm not even sure where fuel could feasibly enter the crankcase...

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post #5 of 13 (permalink) Old 11-18-2019, 09:22 PM
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Re: 7.3 crankcase full of diesel fuel....help!!

It could still be the injector O rings. However that is a lot of fuel to come from the O rings

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post #6 of 13 (permalink) Old 11-18-2019, 09:25 PM
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Re: 7.3 crankcase full of diesel fuel....help!!

Quote:
Originally Posted by Cummins Junkie View Post
If it's o-rings, you should be getting oil in the fuel, not fuel in the oil. The oil pressure is higher than fuel pressure. I'm not even sure where fuel could feasibly enter the crankcase...

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Engine off key on. No oil pressure but the fuel leaking into the oil passages. That would be my guess.

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post #7 of 13 (permalink) Old 11-18-2019, 09:52 PM
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Re: 7.3 crankcase full of diesel fuel....help!!

Kuality,

I have read a couple of posts here that recommend you pull the lid off the fuel filter and check for oil in the fuel filter and fuel filter housing. As Junkie points out - this is an indication that the seals between the fuel and oil sides of the rail are leaking. I'm not sure as to the "how" you are getting fuel down in the oil. How long since your last oil change? Dead cylinder washing down past the rings? If your truck were older (1997) I'd say look at the lifter pump in the valley. Is there fuel in the coolant?
Kyle may be on to something as well... fuel leaking into the oil rail when the electric fuel pump comes on just before you start the truck when there is no pressure on the oil side. Well just a few thoughts.

Cj

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post #8 of 13 (permalink) Old 11-18-2019, 10:04 PM
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Re: 7.3 crankcase full of diesel fuel....help!!

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Originally Posted by cjfisher View Post
Kuality,

I have read a couple of posts here that recommend you pull the lid off the fuel filter and check for oil in the fuel filter and fuel filter housing. As Junkie points out - this is an indication that the seals between the fuel and oil sides of the rail are leaking. I'm not sure as to the "how" you are getting fuel down in the oil. How long since your last oil change? Dead cylinder washing down past the rings? If your truck were older (1997) I'd say look at the lifter pump in the valley. Is there fuel in the coolant?
Kyle may be on to something as well... fuel leaking into the oil rail when the electric fuel pump comes on just before you start the truck when there is no pressure on the oil side. Well just a few thoughts.

Cj
Right my thought was maybe this has been happening for a long time and it now diluted the oil enough to cause a no start.

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post #9 of 13 (permalink) Old 11-18-2019, 10:14 PM
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Re: 7.3 crankcase full of diesel fuel....help!!

Kyle,

Yea... me too - which is why I asked the question about the OP's last oil change. At this point I'd pull all the injectors and boroscope all the cylinders to check for damage too. Pops and Bangs generally make me think something bad has happened. Granted... an 8 foot tongue of flame out the tail pipe would do that too. Hmm... I wonder if you could have a seal leak in one direction aka fuel to oil, but once the oil pressure comes up the higher pressure oil then "reseals" the o-ring.

Cj

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post #10 of 13 (permalink) Old 11-19-2019, 02:57 AM
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Re: 7.3 crankcase full of diesel fuel....help!!

How did we get to fuel in the oil? Any chance it's coolant? Does it have any coolant in the reservoir? Is the oil on the dipstick milky?

Say it won't start, does it spin but not start? Or not spin at all?

From the info given it could be anything from a failed injector to a broken rod......

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