What is this strange sound in fuel rails.

TheBocSez

New Member
Feb 3, 2004
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Converse, TX
I was adjusting my fuel pressure when I noticed what sounded like a vacuum leak in the area of the where the upper/lower intake meet and around the #1 cylinder.

Yes, the vacuum line that goes to the regulator was plugged! :D

I finished adjusting the fuel pressure and put the vacuum line back on and the sound went away.

So I pulled the line back off and plugged it and the sound came back. I started trying to locate it using a mechanics stethoscope but couldn't find it at any of the normal places you would look.

I placed the stethoscope against the metal fuel rails and heard the sound coming from there.

The sound is a hissing sound like a vacuum leak, but once I put the vacuum line back on the regulator, it goes away. Any idea whats causing it? :shrug:

I thought bad regulator, but there is no vacuum sound coming from it, just the fuel rail, it holds steady normal fuel pressure and I observed no fuel coming out of it at idle.

Anyone know? Is it even something I should be concerned about?

Thanks
 
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i've heard that before on mine...i believe it is just fuel being "returned" since the sound steadies when fuel pressure goes up and is intermittant when fuel pressure is lowered.:shrug: