Fuel rail question.

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Oct 26, 2008 | 12:33 PM

rusted&busted

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5th Wheeling

Joined: Oct 2007

Posts: 39

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From: Florida

Fuel rail question.

Hi folks. On the fuel rail on my 4.9 there seems to be "some sort of damper", with a vacuum line going to it. what purpose does this serve? Is it actually a damper? I assume it has a diaphram inside, so how would I know if it went bad? Thanks

Oct 26, 2008 | 12:57 PM

bjafeman

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Joined: Sep 2008

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Is this what you're talking about? I don't know what this is, but I'm trying to find out as well.

Oct 26, 2008 | 02:37 PM

Motorhead351

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Joined: Sep 2004

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fuel pressure regulator.

Oct 26, 2008 | 03:23 PM

rusted&busted

Thread Starter

5th Wheeling

Joined: Oct 2007

Posts: 39

Likes: 0

From: Florida

Thanks Motorhead. Is this regulator adjustable at all? What would be syptoms of failure?

Oct 26, 2008 | 08:10 PM

MatCat58

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Joined: Feb 2008

Posts: 54

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From: Buckeye Country

Isn't the fuel pressure regulator on the front of the fuel rail, between the fuel lines and the rail? That piece has two vacuum lines and a computer pigtail, one of the vacuum lines goes to the two vacuum ports on top of the throttle body and I think the other one goes to the charcoal canister but I'm not positive because mine was never hooked up. I think that piece has something to do with emissions.