S5 NA Fuel Rail Question

LunchboxCritter · 10-31-2010, 11:05 PM

What does this rubber piece on the end of the primary fuel rail do? Is it bad that it falls off easily? Can it be repaired? Has anyone else ever experienced this same thing?

They worked just fine when I removed them. I sold them to someone and when they got them that little piece felll off.

Any help would be greatly appreciated.

RETed · 11-01-2010, 12:55 AM

That's the pulsation damper.
That little rubber piece is part of the diaphragm inside.
As long as it's not leaking, it's all good.

-Ted

***TitaniumTT*** · 11-01-2010, 05:20 AM

Very true, but, if that piece of rubber is getting dry, I would assume that the rest of the unit is starting to get old too.

LunchboxCritter · 11-01-2010, 10:15 AM

Cool Thanks.

rxspeed7 · 11-03-2010, 04:55 PM

iirc it is built into the s5 rails, and that the only way to correct a potential and serious fire hazard it to replace the rail or upgrade the fuel rails and run an aftermarket fuel pulsation damper.

The purpose of the PD is to help alleviate pressure pulsations(from injectors opening and slamming shut) in the fuel rail in an attempt to keep pressure the same at all times and make sure that they don't get sever enough to crack the rail,cause a leak or break an injector.

i would strongly suggest replacing it so that you don't potentially lose your car.

Zack

10-31-2010, 11:05 PM	#1
LunchboxCritter Simply Rotarded Join Date: Jan 2009 Location: Florida iTrader: (0) Posts: 166 Rep Power: 16	S5 NA Fuel Rail Question What does this rubber piece on the end of the primary fuel rail do? Is it bad that it falls off easily? Can it be repaired? Has anyone else ever experienced this same thing? They worked just fine when I removed them. I sold them to someone and when they got them that little piece felll off. Any help would be greatly appreciated. __________________ LunchboxCritter - 91 NA to J-Spec TII - 88 FC Vert - 04 Rx8 Disclaimer: I am not a mechanic, and I did not sleep at a Holiday Inn. DO NOT TRY THIS AT HOME!!! Last edited by LunchboxCritter; 10-31-2010 at 11:17 PM..

11-01-2010, 05:20 AM	#3
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	Very true, but, if that piece of rubber is getting dry, I would assume that the rest of the unit is starting to get old too. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

11-01-2010, 10:15 AM	#4
LunchboxCritter Simply Rotarded Join Date: Jan 2009 Location: Florida iTrader: (0) Posts: 166 Rep Power: 16	Cool Thanks. __________________ LunchboxCritter - 91 NA to J-Spec TII - 88 FC Vert - 04 Rx8 Disclaimer: I am not a mechanic, and I did not sleep at a Holiday Inn. DO NOT TRY THIS AT HOME!!!

11-03-2010, 04:55 PM	#5
rxspeed7 The fan hit the shit! Join Date: Nov 2010 Location: ocala,fl iTrader: (0) Posts: 152 Rep Power: 15	iirc it is built into the s5 rails, and that the only way to correct a potential and serious fire hazard it to replace the rail or upgrade the fuel rails and run an aftermarket fuel pulsation damper. The purpose of the PD is to help alleviate pressure pulsations(from injectors opening and slamming shut) in the fuel rail in an attempt to keep pressure the same at all times and make sure that they don't get sever enough to crack the rail,cause a leak or break an injector. i would strongly suggest replacing it so that you don't potentially lose your car. Zack