6.4L Vapor or Exhaust Leak at High Pressure Fuel Line - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 08-23-2019, 11:50 AM Thread Starter
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6.4L Vapor or Exhaust Leak at High Pressure Fuel Line

I noticed the other morning at a stoplight that I was venting or exhausting something from my engine compartment. I checked it out once I got to work and saw what I thought was an exhaust leak from one of the pipes at the firewall. The more I looked at it the more I saw that it was coming from an area very close to the fuel line on the valve cover. Anyone have any idea what I'm dealing with here? I'm not able to provide any links or videos because my post count is too low. I can send them directly if that helps.
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post #2 of 4 Old 08-23-2019, 12:40 PM
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I would first look at the turbo up pipes. One of the most common things to fail on a 6.4. Even more so if you are deleted. There are multiple places for these to fail on the pipes but the most common are at the flex pipe parts. It is common to have exhaust manifold bolts break or simply fall out that can cause leaks but these are usually followed by a horrible screeching sound while acceleration. It’s very rare for fuel leaks in these. A common trick is to wrap toilet paper or paper towels around the up pipes, start the truck and give it a few good pedal pumps. Not too long as it will burn/char the paper. That will be a quick test on the pipes
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post #3 of 4 Old 08-23-2019, 01:36 PM Thread Starter
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Thanks. The turbo and exhaust pipes were all replaced about 50k ago.

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Originally Posted by colesalisbury01 View Post
I would first look at the turbo up pipes. One of the most common things to fail on a 6.4. Even more so if you are deleted. There are multiple places for these to fail on the pipes but the most common are at the flex pipe parts. It is common to have exhaust manifold bolts break or simply fall out that can cause leaks but these are usually followed by a horrible screeching sound while acceleration. It’s very rare for fuel leaks in these. A common trick is to wrap toilet paper or paper towels around the up pipes, start the truck and give it a few good pedal pumps. Not too long as it will burn/char the paper. That will be a quick test on the pipes
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post #4 of 4 Old 08-26-2019, 12:54 PM Thread Starter
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After digging into over the weekend I see that it is venting from the rubber grommet that surrounds the fuel rail at the valve cover.
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