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Vacuum Lines


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I'm new to this and have a couple of question if anyone can help me.

First question: Is it normal to have fuel in your vacuum lines, especially near the fuel pressure regulator end?

Second question: Why does this line keeps on coming off? Everytime I plug it back in, it dont stay in for long.

Any help would greatly be appreciated. Thank you

This is on my 95 Lexus ES300

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Funny thing is that the car runs great and I've been having this problem for over 2 months now. The line that keeps on coming off is connected to the vacuum assembly thats nesting on top of the front injectors. Its the first thing you'll see when you pull the lexus plastic cover off. It would stay on for a couple of days and then pop off. I'm wondering the only way for fuel to get into the vacuum line would be thru the fuel pressure regulator right? Any help or ideas that I can look into?

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