Im about to order AN fitings and stainless steel lines for my fc and I have never done this be for and I could use some help. I have an s4 t2 secondary fuel rail and an s4 na primary rail. I want to run one line from the fuel pump and then have it splite off to both fuel rails and then come from the fuel rails then go back to one line going to the fpr Im going to get and then back to the tank. I dont know what fitings to get to fit my fuel rails? I would like to run 8AN line and fitings. am I going to have to drill and tap my rails to make the fitings fit?

 

-6 AN is good for around 500hp, which means that parallel -6 AN should be good for about 1,000hp, so I doubt you would need -8 AN unless you have a turbocharged 20B engine. Below is RETed's S4 TII parallel fuel rail diagram, which is a good starting point for your setup. If you plan on over 500hp, then you can run -8 AN (1/2" hard line) from the fuel pump to the Y-block, and then -6 AN (3/8" hard line) from the Y-block to the rails and back to the tank. The Aeromotive website has a "Power Planner" section to help you choose components.
Aeromotive*|* Power Planner

Also, I recommend that you use a fuel pressure regulator with a built-in pulsation damper as typically found on Aeromotive and SX brand regulators. Several years back we had some people on this forum bitching because they followed the diagram but used cheapie Marren regulators that do not have the pulsation damper function, and they blamed their resulting engine failure on this.

 

thats perfect thank you so much! Im aiming for 500-600hp and Im probably going to be running E85. I will probably do 8AN up to the spliter and 6AN from the spliter on. and I will be going with an aromotive fpr. I havent been able to fined an AN spliter fiting like that on summit though. I will have to call and ask them if they have one.

 

Is this kind of setup required for 300-350 hp? Im building my car for track days so I need the system reliable. My setup is FD fuel pump, stock s4 t2 rails, with ID1000 primaries and secondaries

 

http://www.summitracing.com/search/d...keyword=an%20y
Try this selection, should be what you need for the y adapter

 

yes the damper is really important. we tried to setup a haltech on a turbo honda once and the pulsations were so bad we couldn't.

its actually really loud and violent when it happens, and on that car it happened right off idle, but if it had happened at say 5000rpm instead we'd need a broom to pick up engine pieces

 

Besides the Y-adapters posted by cloudzero, you could also use a fuel distribution block, depending on how you want to route the lines. If you are new to this, note that AN ORB bulkhead fittings are slightly different than flared AN fittings.
http://www.summitracing.com/search/p...ibution-blocks

The OEM lines are 5/16", which are usually good for about 300hp before taxing the pump. An extra 50hp should not make much difference, and these horsepower rules of thumb have a lot of variables, so they are in no way set in stone. Some people claim to have run up to 500hp on the OEM fuel lines.

 

thank you guys so much! all this helps alot!

 

You can also use a T fitting.
I did that when I could not get a Y block.
Same difference only the angles are 90 degree instead of 45.