Custom Fuel Rail
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 74
Likes: 3
From: St. Louis, MO
2003 Mercedes SL55
Custom Fuel Rail
I plan on building a custom fuel rail and have a few questions. This will be for an sl55 but the concept is the same.
First, what is the connector on the firewall which has a hose going to the fuel rail? 6an? 8an?
Second, is the pulsation damper necessary? What would be the effects if removed?
The plan is to run a new feed line into a Y then feed the engine from the back with equal length hose and also loop the front of the rail.
I have been welding for a long time and plan to pressure test the components before install.
Thank you
First, what is the connector on the firewall which has a hose going to the fuel rail? 6an? 8an?
Second, is the pulsation damper necessary? What would be the effects if removed?
The plan is to run a new feed line into a Y then feed the engine from the back with equal length hose and also loop the front of the rail.
I have been welding for a long time and plan to pressure test the components before install.
Thank you
MBWorld Fanatic!
Joined: Aug 2010
Posts: 2,156
Likes: 7
From: Northern Va
Dirt Scooters
Not sure if it's 100% needed. The larger the volume of fuel the less the effects are. The hose on the fire wall is a weird metric fitting and isn't easy to find not to mention it's not a typical flared end either.
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 74
Likes: 3
From: St. Louis, MO
2003 Mercedes SL55
Thanks, I found this adapter as well as 1 on Pegasus website that goes from 14mm to 6an. My plan is to the go to 8an and run the rest of the line as 8an.
Will I loose significant pressure due to the volume increase going to 8an all the way to the rail via a 8an in Y adapter 8an out ?
http://www.extremepsi.com/store/product.php?productid=20907&cat=1712&page=1
Super Member
Joined: Mar 2011
Posts: 502
Likes: 0
From: Porter Ranch, CA
E55, CTS-V Wagon, Duc 1098R
No you shouldn't lose any pressure. The pressure won't drop due to the larger rail size. In fact it should stay higher statically due to the fact that with the bigger diameter you have more reserve. It will only drop if the flow increases significantly because the pumps won't keep up.
