Stumped by this fuel leak - Ford Powerstroke Diesel Forum
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Old 10-17-2012, 01:14 AM
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Stumped by this fuel leak

This fuel leak has me stumped. I have a 1996 F-350 dually with the 7.3. 300,000 plus miles on it. I had a major fuel leak from top of the engine,so I replaced the usual suspects,the lift pump,new banjo washers,fuel bowl,all new sensors,harness ect. So I fire up the truck. Started right away,watched it at idle,and what I saw floored me. At the connection where the Exhaust back pressure tube connects to the Exhaust back pressure sensor,fuel was spewing out like no tomorrow. Is there even suppose to be fuel in this line? If not,what would be causing the fuel to get in the line to begin with? I hope someone has an answer. I sure could use it right now. Thanks.
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Old 10-17-2012, 09:23 AM
Hee Hee, he's doing it...
 

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But it idles/drives fine??? This sounds like a non firing cylinder pushing its juice into the exhaust manifold and the exhaust gasses from the other cylinders are then forcing it forward toward the EBP tube. Or collapsed injector free flowing raw fuel into the cylinder and then the rest as before. Also if there is liquid coming from the tube then it's time to replace.
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Old 10-17-2012, 12:05 PM
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_Might_ be interesting to disconnect each UVCH, one at a time, and briefly run the truck and observe each time. If it goes away with one of the tests, then one of the two cylinders associated with whichever UVCH is disconnected at the time is suspect.
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Old 10-17-2012, 12:12 PM
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It idled fine but I would not dare drive it with how much fuel is being pushed out of the end of the tube by the back pressure sensor.
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Old 10-17-2012, 12:24 PM
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Sounds like a fuel geyser in one of the cylinders. Only thing I can think is run a cylinder contribution test

Sent from my DROID BIONIC against my will
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Old 10-17-2012, 01:44 PM
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Sorry, I wasn't suggesting driving it. Just run the engine long enough, each time, to determine if the leak is there, or goes away.
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Old 10-17-2012, 02:14 PM
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I think that I did. I asked if it idled and drove ok. Not that I was suggesting it either.
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Old 10-17-2012, 03:51 PM
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No prob guys. And thanks for the suggestions. I guess my next step then will be to pull the valve covers off and check the UVCHs and see what the injectors may be up too. Should be interesting,seeing how the covers have never been off.
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