Fuel leak after engine off. - Ford Powerstroke Diesel Forum
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Old 11-18-2011, 01:25 PM
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Fuel leak after engine off.

My 03 F350 is leaking fuel and only seems to leak after the engine is shut off. I can see fuel in the valley between the heads but cannot find a source. coincidentally a friend w/ a 7.3 is haveing the same issue. I can leave it running for quite some time and no leak untill the engine is off then I get a puddle about as big around as a basket ball leaking down the back of the engine. HELP!!!
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Old 11-18-2011, 03:44 PM
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Check fuel water sep. valve
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Old 11-19-2011, 03:05 AM
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Yah I meant to post that its not the valve, its closed. Looks like its mabey leaking somewhere by the turbo.
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Old 11-19-2011, 05:20 AM
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The valve has Orings and can still leak. The fuel bowl has many orings and can leak past them too.
But if the leak is STARTING back toward the turbo there is a fuel line from the bowl the back of the passenger head fuel rail that has a bracket to hold it in place since it's so long. The bracket rubs a hole in it and there ya go. If that's it, wrap some rubber between the new bracket and line so it won't rub again.
Only thing is, that line will leak with the fuel pump running because everything after the pump, which is everything in the motor area, has positive pressure on it so I bet it's leaking even when running, just harder to see.

Turn the key on engine off, the fuel pump will run a few seconds. You can look for the leak that way. Or hook 12V straight to the fuel pump that way you have time to search for a leak.
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