Building a fuel system for 800+ hp need help with the return regulator
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Doing a 370ci F1-A build and I am working out on how to do my fuel system.
Right now I am planning on running the DYI Walbro 255lp pumps with an -8an feed line to a single rail then a crossover then return. Off the return rail I am going to run an inline fuel pressure regulator but I am having a hard time finding an recommendation on what to run. Could I run a -6an inlet or should my inlet stay -8an and just run -8an all the way back to the tank? Also which regulators have people been running at the power levels I want to make?
Right now I am planning on running the DYI Walbro 255lp pumps with an -8an feed line to a single rail then a crossover then return. Off the return rail I am going to run an inline fuel pressure regulator but I am having a hard time finding an recommendation on what to run. Could I run a -6an inlet or should my inlet stay -8an and just run -8an all the way back to the tank? Also which regulators have people been running at the power levels I want to make?
#2
TECH Resident
iTrader: (1)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I ran -8 all the way to the back of the block. Then split with a Y block. -6 lines go from the Y block to the back of each fuel rail. And then -6 lines go from the front of the fuel rails to the 2 inlets of the fuel pressure regulator. I use a single -6 return line to the tank.
I'm only making a little over 600hp, but this set up maintains pressure volume all the way to 7,000 rpm.
I'm using this regulator: http://aeromotiveinc.com/products-pa...***-regulator/
I'm only making a little over 600hp, but this set up maintains pressure volume all the way to 7,000 rpm.
I'm using this regulator: http://aeromotiveinc.com/products-pa...***-regulator/
#3
10 Second Club
iTrader: (2)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I am running -8 from a y block to each rail, then -8 from the other end of each rail to the same regulator http://aeromotiveinc.com/products-pa...***-regulator/, then from there I run a -6 to a 5/16 hard line back to the tank.
#7
Trending Topics
#8
TECH Addict
iTrader: (88)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
It's gonna be difficult adjusting or even mounting the FPR at the rear of the rails because its under the cowl, plus the passenger side has less clearance than the driver side..
#9
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I was going to run a line down and mount it in line not off the rail so I have more room. Figure 1.1 in this pdf is an option as well but then the flow stops at the end of the passenger rail. Is it ok to do that?
http://aeromotiveinc.com/wp-content/...3101-09-14.pdf
http://aeromotiveinc.com/wp-content/...3101-09-14.pdf
#10
TECH Resident
iTrader: (1)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Looks good except I would feed the top of the driver rail, crossover in the rear and mount the FPR directly to the front of the passenger rail.
It's gonna be difficult adjusting or even mounting the FPR at the rear of the rails because its under the cowl, plus the passenger side has less clearance than the driver side..
It's gonna be difficult adjusting or even mounting the FPR at the rear of the rails because its under the cowl, plus the passenger side has less clearance than the driver side..
I don't like mounting that kind of stuff on the engine if I don't have to. I don't like to subject them to that much vibration. I don't even have my oil pressure sensor mounted on the engine.
But I road race hard and often. And that can really put a strain on things. So it gives me a slightly tilted view of things.
I was going to run a line down and mount it in line not off the rail so I have more room. Figure 1.1 in this pdf is an option as well but then the flow stops at the end of the passenger rail. Is it ok to do that?
http://aeromotiveinc.com/wp-content/...3101-09-14.pdf
http://aeromotiveinc.com/wp-content/...3101-09-14.pdf
In theory, you can mount the pressure regulator anywhere you want to, even on top of the fuel tank. I don't know why you would, but you could. For best performance, it should be as close to the fuel rail as possible.
#11
#12
FormerVendor
iTrader: (33)
Join Date: Feb 2002
Location: Lake in the Hills, IL
Posts: 5,052
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
This is the correct way to do it. -8 feed and -6 return a minimum anything smaller becomes a restriction after 600whp larger help keep things cool and keep pressures in check. I rec the Magnafuel regulator reliable and completely stable. Have had serious pressure issues with other regulators. 800hp is no joke do not want fuel issues. Do it right the first time and you will have room to grow. Feel free to call with any questions we are here to help.
#13
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I have been looking at the magnafuel MP-9925-B boost referenced regulator. Would I just run a block off fitting on the second inlet? Would running an -8an return effect anything in means of being too big?
Last edited by M33P; 02-24-2014 at 07:47 AM.