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Fuel Pressure Damper DIY - W211 E55 AMG

 
Old 06-13-2016, 02:52 PM
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2016 E63s Wagon - CCB & CF package
Fuel Pressure Damper DIY - W211 E55 AMG

Hey all,

Figured I'd share and post this quick DIY for anyone who may have to replace this little sucker on their 03-06 E55. I started smelling fuel under the hood, it was faint but it was definitely there. Usually went away after few minutes of driving but any fuel smell = no good in book. Upon further inspection, all the injectors were clean and dry which led me to smelling around the rest of the fuel rail. The smell was coming from the throttle body area. Finally, i felt dampness on the bottom of the fuel pressure damper and decided to replace it as the o-ring was probably dry and letting fuel seep by.

I purchased the new FPD (P/N 1120780092) from the local dealer, along with a new retention clip for about $70. I would recommend a new clip as the original was noticeably more spread open due to its age.

Here is the install (few pics attached below):

1. Lift the hood to service position (full 90* angle)

2. Remove airboxes and the Y intake

3. Remove 4 torx bits holding the throttle body in place. T30 if my memory serves me correctly.

4. Remove the lower PCV hose bracket from the TB and set it aside (dont drop it like I did) and pull the PCV hose out of the TB.

5. Set the TB aside. *This is a good time to clean your TB by the way!

6. Set a few rags under the TB and under the FPD as you will have some fuel spilling. I did mine after the car sat overnight so it was a bit less fuel. If you are starting with a hot car, make sure to de-pressurize the rail by relieving pressure at the fuel rail schrader valve on the front of the passenger side valve cover.

7. Finally ready to attack the FPD. Using a large flat-head screw driver, pull the clip out (towards the firewall). It should come out fairly easily.

8. With pliers, slowly remove the FPD out of the rail. Wiggle left to right ever so slightly, you dont want to damage the rail. Mine came out with very little effort.

9. Have the new FPD near. Put a dab of oil on the o-ring, and slip the new FPD in. Using a lever, ensure the new FPD goes all the way into the fuel rail. I used a large flat-head and leveraged against the blower.

10. Install the new clip.

Then reinstall all items in reverse order. Remove rags. Once all done, i ran some water around that area to make sure all the fuel is washed away.

I hope this will help someone! Cheers.
Attached Files
File Type: pdf
FPD.1.pdf (216.3 KB, 415 views)
File Type: pdf
FPD.2.pdf (258.7 KB, 405 views)
File Type: pdf
FPD.3.pdf (211.0 KB, 318 views)
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BoostedAero (08-22-2016), forcedawd (06-21-2016), Hotsauce55 (04-24-2017), MACEDON (04-24-2017), menace2sobriety (06-23-2016), nanayaw6 (06-15-2016), nivram13 (11-28-2017)
Old 06-15-2016, 11:29 PM
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'05 E55 & ‘00 ML55
Jut curious, could a faulty FPD cause any noticeable issues at idle or in drive? What would be a tell tale sign of a faulty one other than a fuel smell?
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Old 06-16-2016, 03:17 PM
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2003 e55, 2003 SL55
the FPD can also clog up over time and be dirty, which can cause drive ability problems.
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Old 06-21-2016, 04:40 AM
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Is there a part number for that clip or does it come with the FPD?
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Old 08-22-2016, 02:29 PM
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Originally Posted by WANTED!! View Post
Is there a part number for that clip or does it come with the FPD?
Sorry, just seeing this now. I'm sure there is but I don't know it. When I got the FPR, i just asked the counter guy at the dealership to include the clip as well.
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Old 04-24-2017, 04:36 PM
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Gonna try to do this myself...
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Old 04-24-2017, 04:41 PM
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Originally Posted by MACEDON View Post
Gonna try to do this myself...
You got it man. Remove the box and the throttle body to give yourself access. Other than that, its easy. Just make sure to put a dab of oil on the o-ring and seat the regulator correctly.

PS - I'd recommend having a friend start the car as you watch for fuel leaks.

Last edited by V-AMG; 04-24-2017 at 04:50 PM.
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Old 04-24-2017, 04:59 PM
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Originally Posted by V-AMG View Post
You got it man. Remove the box and the throttle body to give yourself access. Other than that, its easy. Just make sure to put a dab of oil on the o-ring and seat the regulator correctly.

PS - I'd recommend having a friend start the car as you watch for fuel leaks.
You mean like after I reinstall it?

I've never removed a throttle body so this'll be a first for me, but if I can do it without shidtting my pants maybe I can do an upgrade later on. Been watching a lot of vids on how to remove the sc pulley too so I might do the upgrade myself
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Old 04-25-2017, 10:13 AM
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Originally Posted by MACEDON View Post
You mean like after I reinstall it?
Yes, after you are done.

Originally Posted by MACEDON View Post
I've never removed a throttle body so this'll be a first for me, but if I can do it without shidtting my pants maybe I can do an upgrade later on. Been watching a lot of vids on how to remove the sc pulley too so I might do the upgrade myself
TB is very easy to remove. Literally 4 bolts and that's it. Dont even worry about unplugging the plug, just set it aside. And be sure not to drop ANYTHING into the blower, maybe stuff a clean rag into the hole just to be safe. You can cause serious damage if you drop something in there. So just cover it so you dont have to worry about it.

Regarding the pulley, see how this goes first. If this is a breeze, attack the pulley next. I'm always here to help so if you are in a pinch, shout me a holler.
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Old 11-28-2017, 02:50 PM
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The time is coming that I need to do this... I have a stupid question please don't laugh.... fuel pressure regulator and damper mean the same thing, no?
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Old 11-28-2017, 07:53 PM
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Originally Posted by MACEDON View Post
The time is coming that I need to do this... I have a stupid question please don't laugh.... fuel pressure regulator and damper mean the same thing, no?
You’re all good man. And yes, same thing.
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Old 11-29-2017, 05:27 AM
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Well... not exactly. The fuel pressure damper is just a little spring loaded canister to smooth out the pressure pulses in the fuel rail. A fuel pressure regulator is for setting the maximum pressure and maintaining it. I don't think we have one of those in the system.
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Old 11-29-2017, 08:31 AM
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Yeah I'm not so sure, a mechanic told me it needs changing while discussing the supercharger overhaul. Maybe he used the wrong word for it- I don't know.
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Old 11-29-2017, 10:57 AM
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Originally Posted by StarvingArtist View Post
A fuel pressure regulator is for setting the maximum pressure and maintaining it. I don't think we have one of those in the system.
I thought the fuel pressure regulator was attached to the bottom of the (in tank) fuel sender? Go to 3:26 in the video posted below.


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Old 12-01-2017, 05:44 AM
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Thanks, That makes sense having the regulator right there under the filter. Overpressure can just bleed out into the tank again.
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