Fuel Leak - Ford Powerstroke Diesel Forum
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Old 12-10-2009, 08:17 PM
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Fuel Leak

Sorry if this has been discussed before. I can't find what I'm looking for.

I have a 1999 F-350 Powerstroke. I noticed a smell of raw fuel, and as close as I can tell it is coming from a hard line/fitting where it attaches to the drivers side front head - behind the alternator. It appears wet, but no noticeable drips while idling. There may also be a leak in the rear as well, but it is difficult to see without removing some items. The back of the engine down around the torque converter shroud and oil pan is wet too. Not dripping, just wet.

I read all about the fuel filter drain O-rings, but I don't believe this is my problem as that area is basically dry and nothing leaks out of that tube down below. The valley is basically dry as well. The main wet area I found is the area described above, and where the engine fan has blown fuel on the turbo tubes, etc. and then of course the back of the engine or rather oil pan,etc

I see no obvious drips at an idle at either location, but the line at the front of the head is the most obvious culprit to me. Would this be an O-ring connection as well like the others I've seen described, or is it a normal flare fitting? It has a mark on it as if to line up and check for loose or tightening. I put a wrench to it but everything seems tight and is lined up. Help??

Truck is an early 1999, 41000 miles garage queen. Has it been parked too much or ? Help. Thanks

Last edited by Bluteam; 12-10-2009 at 08:29 PM.
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Old 12-11-2009, 11:42 PM
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sorry nobody has helped you yet...

the most common place for a fuel line to leak is on the passenger side under the GPR bracket... there is a mount that rubs a whole in the line... its worth checking but if you have no fuel in the valley, that probly isnt it...

the fuel fittings are NPT fittings into the head and the the fuel line has a compression fitting that tightens to the top... you can check those but its not easy to get in there... that is the only fuel line in that area so if you sure its fuel, its most likely that line or the fitting going into the head has come loose...

kinda confusing the way i put it but i hope it helps...

i had that passenger side line start leaking bad so i replaced all the stock lines with Parker pushloc
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Old 12-12-2009, 10:37 AM
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Thanks. That wasn't confusing at all. I saw that clamp on the passenger side line and yes, reminds me of a 3406 Cat with all the clamps rubbing holes in the injector lines. Bad news, but thats not my problem - yet anyway.

So my son and I spent all day yesterday climbing in and under cleaning up the engine to start over from scratch. Ran the engine, drove it around, looked, smelled, nothing. We even used the bore scope to look down under and in the back where its hard to see and nothing. Both of us were convinced it was the rail line at the drivers side head in front that was leaking. The line appears to be sitting in the compression fitting slightly off, but still tight, and thats why I was wondering what kind of fitting that was. Thanks for clarifying.

Anyway, have not been able to get anything to leak now, so we'll just keep an eye on it. May have been a problem with it sitting for so long I guess. Maybe something dried out and sealed back up. I don't know. But hey, at least I have found some really good info on some mods I'd like to make from this sight.
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Old 12-27-2009, 03:35 PM
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OK we figured out it was the line where it attaches to the fitting in the head. Took it off and looks like its supposed to have a little donut looking rubber dealie bobber. Looks like its deteriorated.

Any good advice on replacing with aftermarket or just visit my dealer for some new ones?
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Old 12-27-2009, 05:15 PM
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just cut a piece of 1/4" fuel hose, approximately 1/4" long. slip it over the line, run the nut over it, and tighten it up, problem solved for several more years.

and free if you have any line laying around.
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Old 12-28-2009, 02:12 PM
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I'm getting a lot of fuel dripping out of one of the lines coming down in front of the passenger side head. It only happens when the truck runs, and it's probably dripping at a rate of a drop every 3 or 4 seconds. It started about a month ago when we started getting cold weather. Oh, I believe that line comes from the fuel pump area.

Any ideas?
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Old 02-16-2010, 02:04 PM
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I too just started having this problem. If anyone has experience with this and has replaced the hoses. What kind did you use and how long did it take you to do. Also what all did you have to remove if anything.
2002 F-250.
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Old 02-16-2010, 03:13 PM
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Before I "rigged" it with cut fuel line, I would order these:

Replacement O-rings for Ford Diesel Engines
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