The trouble with diagnosing a vacuum leak in your truck is that it can be coming from so. You are currently viewing our boards as a guest which gives you limited access to view most. I’m thinking it may be a vacuum leak, but honestly I’m not too sure. I have a k&n intake installed which may be the source of the problem. Any suggestions regarding where I should start looking? 1994 F150 5.0L I beleive I have a vacuum leak coming from the fuel pressure regulator area.

Question: Here is a question for you -> Which one of those vacuum lines is attached the bi-metal sensor? (little silver thing inside your air-box) Thx, vacuum leak 1997 – 2003 F150. Normally a Ford Taurus runs smoothly, but a vacuum. I have a 2004 5.4l f150 with an engine light coded as vacuum leak. I can hear a hissing sound coming from the fuel pressure I posted this question some time back but lost the replies.
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I do believe the van has a minor vacuum leak
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