Well, I almost have everything to finish my car. The last thing I need to get is my fuel line. I wanted to go with a SS Braided line. From the tank, right into the pump, FPR, and AEM Rail, I was thinking of -6 AN, is this too small, or just right. And the only place I have seen to order it is Summit, does anyone else know another place?

 

Is this an NA car? Running larger line right from the tank is overkill unless you've done some serious modifications.

Take it to a shop and they'll run proper hard line from the tank to the engine bay. Then run the SS line from the filter to the rail. Similar to the stock system now.
Otherwise you can just do this:
http://www.hondaprelude.to/articles/fuel-line.html

Unfortunately the fitting sizes for the AEM are different now with their new design, so find out what the proper sizes are before ordering new fittings.

 

This is for a turbo setup. 15-18 psi daily. 750 cc injectors, all out. I like the setup you used, and that is more cost effective. So, will I overcome the capabilites of my existing stock line, or do I need to upgrade that?

 

I don't know about the stock line capabilities. I'm running a similar setup, though I only have 550's and I'll be pushing the limits of those. When I put in my fuel pump it looks like the biggest restriction is the output that comes out of the tank. The little metal port that comes off the tank looks like it'll be the hardest to upgrade. Only thing you can do is tap it out and put some new fittings on it.



In most areas, domestic shops usually have way more experience running new hard lines than import shops. They're usually cheaper too.

I have a really strong bosch pump pushing the fuel through so I'm hoping I wont have to upgrade the fuel line soon.

 

is there any disadvantage of running a fuel line that is too big for your application?

 

There's no disadvantages to running a larger fuel line than you really need.

 

Yes there is, extra money

 

True.

 

Yo, Dirty, just kidding. Hey bro, I am going to run this setup on my car, but I wanted to hit you with a couple more curve *****. First, do you know the fitting that screws into my AEM Fuel rail? Is it a -6 AN? Also, I am going to be running the AEM FPR and I would like to modify this setup to first run into the the FPR. Then I was hoping there might be a fitting that would screw into the FPR and the rail, but also have a "T" that I could screw a Fuel Pressure Gauge into. I know there has to be one, and I will to the research if you don't know, but I like to get my info from someone who has been there, and done that, you know what I mean. This is one of the final things I need to get to finish my project, so hook a brother up. =D

gsr*lude

 

Okay, I lost you a bit here.

This all depends on how you are planning to feed the lines. Are you going to try feeding both ends or just one end? On my setup I'm not using the FPR outlet on the top of the rail at all, it's plugged. The driver side of the rail I'm using to feed the fuel and the passenger side I'm using as the return.

Are you forced to keep the EGR valve? The EGR valve get's in the way of one end of the rail and unless you get rid of it, makes it impossible to send a line to that side.

I don't have any real good pics of the final setup, but here's some during the rebuild. Sorry, big pics.

You can see the plate that I made up to cover the EGR flange. This is the feed side of the rail. http://www.higginstribe.com/gallery/...e=DSC00001.JPG

This is the return side of the rail. This fitting now runs to an Aeromotive FPR. You can see the fitting with the hole in it on the feed line. That fitting is a gauge adapter fitting. The hole is a 1/8" NPT and will fit a fuel pressure sender or liquid filled gauge. http://www.higginstribe.com/gallery/...gine-side1.jpg

I believe the ends of the AEM rail are 1/2"NPT, so if you want to run -6 line, you'll need 1/2" NPT to -6 AN fittings.

The AEM FPR that you have; is this the one that mounts directly on the rail or the universal one? I don't know what fittings it has on it, so I can't really help you on that. I know they're AN fittings. They look like -4 return, but as far as I know it's -6. The steel braided -6 return line on mine just goes to the hard metal return line at the firewall under the engine and is held on by a standard hose clamp.

All the fittings you can find at anplumbing.com or summitracing.com

edit: The 1/2" NPT on the AEM rail is just a guess. I think I remember from when it was put out that it was 1/2" NPT, but don't go on only my word, call them or test a 1/2" NPT fitting on it.


[Modified by DirtyLude, 7:40 PM 11/13/2001]

 

DirtyLude, Your rebuild looks hot, I hope to do that to mine someday. I waiting impatiently for my F-max to ship, any tips for the install?

 

Ya, here ya go.
http://www.hondaprelude.to/articles/inst_turbo.html

 

Dirty,

You were right. I finally pulled the Rail and FPR out and started to get a better feel for what I need. Now, I think the Rail is -6 AN, and it has two 1/8" NPT on top. I will plug the one for the factory FPR and screw my Fuel Pressure Gauge right into the rail. Simple. Well, the FPR and the Fuel rail have the same size ports on them. How do I find out if they are -6 An or 1/2 NPT? I will need a male-to-male fitting so I can screw the FPR directly into the Rail.

I have a few more things I am going to hit you with. I have a NOS High Pressure fuel Pump (inline). I just looked it up and the fitting on it is 1/2" and it is bigger than the ports on the FPR and the Rail, so they must be -6 AN. So, here is the deal. Should I install the pump after the Fuel filter, get a 1/2"NPT to -6 AN to go from the filter to the inlet of the pump, then take the outlet, which is a 5/16" NPT, convert that to -6 AN, and run it into the rail. Or just put it before the filter and use rubber hose up to the bottom of the filter?

The second thing I have is the EGR Valve. What exactly is it used for. I used to know, but I am brain farting so bad right now it is not even funny. I like the setup you have, and fuel return line had completely slipped my mind until you posted about it. I could always go with a 1/8" NPT for the fuel return, but I don't think that would be very efficent.

I know I am taxing your brain right now, but I am trying to get my Lude done in the next two weeks and I have a few more things I need to make my mind up about.

 

Okay, you're throwing around fitting names all over the place here. I just want to make sure you know what they mean. The two fitting types we're dealing with are AN and NPT.



In this image the top part is a male AN fitting. It's screwed in and the flat part at the top is used to seal the fitting. The female fitting has a flat part that this will fit snugly against.

The bottom part is a pipe thread fitting, NPT. It seals, by slowly reducing the thread size. You have to screw it in tight and use teflon paste or tape so that it doesn't permenantly fuse together if you leave it too long.

The ends of the fuel rail should be NPT fittings. They could be AN, but it doesn't make alot of sense.

Anything bigger than -6 line would be overkill.

You could order from http://www.anplumbing.com (can't get there right now for some reason) or http://www.bakerprecision.com Do a search for Earls or Aeroquip fittings and you'll find quite a few dealers.

As for sizes, I can't really help you without actually seeing the parts. Many muscle car shops or general performance parts stores will stock some fittings. You can take the rail and fpr in and check it against their parts for sizes.

 

You are right, I was just throwing around fitting names like crazy. I just want to let you know where I sit.

The fuel rail and FPR both have either -6 or -8. I am going with -6. Do I need to run a return line like your setup, or can I just plug it? Why would you run the return line anyway, I am kinda confused on that. I am going to be ordering my stuff soon. I checked out AN Plumbing, so I have a better idea of what I am looking at. The other thing I had for you was the EGR Valve. What is it used for, and how did you get away without using it? I plan on getting a Hondata reprogram, I think I will still use it, but I am not sure. I saw you were using the Haltech system. Are you having any issues with HP drop when VTEC kicks in? I have heard it from quite a few people running a FI application.

Talk to you later,

gsr*lude

 

EGR = Exhaust Gas Recirculation. It's an emmissions device and it does exactly what it's name implies. During low load and idle it routes gasses from the exhaust back around to the intake. I got rid of it, because the ECU turns the EGR valve on and off. The Haltech doesn't support it, so it's useless to me.

Everyone has a return line. On a stock car, the fuel return line is the fuel line that's attached to the bottom of the FPR. The fuel pump pumps fuel up to the rail and the fpr regulates the pressure by returning extra fuel back to the tank. On my setup, I don't have the FPR mounted on the top of the rail anymore, so I'm using the other side of the rail as the return. If you have the fpr mounted on the top of the rail, you can just plug the far hole if you want.
http://www.higginstribe.com/gallery/...?image=fpr.jpg

Dark picture, but you can see the Aeromotive regulator. I actually changed it around. I'm feeding from the passenger side and returning from the driver side. The return goes into the side of the FPR and out the bottom to go back to the tank.

 

Dirty,

Quick question, does your return line go back into the FPR? And can you post me some parts for that setup. I am removing the EGR Valve, so I will be able to run my return like yours!

 

Return back into the FPR?

Here's a dark picture of my final install of the FPR. Unfortunately it doesn't show much of the routing.
http://www.higginstribe.com/gallery/rebuild/fpr.jpg

I made up this diagram of how my fuel line is running now. Fuel enters from the top left through the stock fuel filter. Goes though the fuel rail and out the other end towards the fpr. It passes through the fpr and on to the stock return line. The -6 steel braided line is clamped on to the stock hard return line using just a standard hose clamp. The place where the stock fpr usually bolts up to on the rail is plugged up.



Sorry for the crappy drawing, but I just cut and pasted a bunch of stuff I used in a previous drawing. I don't remember the fitting going into the Aeromotive FPR. I think it's 1/2" o-ringed fittings.

 

I see, and the picture really helps, but answer this quick question please. Doesn't the fuel have to pass through the FPR first? And I thought you had that "U" fitting coming off the side of the fuel rail where the EGR went. Am I wrong? Like in this pic,



If no pic, here is the link, http://www.higginstribe.com/gallery/...gine-side1.jpg

 

Ya, the fittings in the diagram aren't exactly what I'm running, it was only meant to explain the workings of the setup. The fitting are close, except that I have a 180 bend fitting instead of the 90 deg fitting shown on the diagram. I also have the fitting to tap in the electrical fuel pressure sender that you can see in the picture.

The FPR goes after the fuel rail. The FPR acts like a restriction. Anything between it and the pump is pressurized.