edin_sl55

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

edin_sl55

Bump, I have seen many setups without the pulsation damper but then again all of these setup had an external pressure regulator with return lines.

e55amgrocket

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.

adianaty

The connection on the fire wall is not AN. It's a metric 14mm thread fitting. I believe Pegasus sells an adapter to a -6 or -8an for it.

edin_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

adianaty

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.