I'm installing FFE primary and secondary fuel rails in my stock twin FD and I'm not sure how to route the fuel hose because there's so little space.

I'm trying to follow the same route as stock. As you can see in the first and second pics, the size and proximity of the fittings (and the solenoid rack) make it impossible to connect the primary and secondary rails with a short section of hose like the way the stock rails are connected.

The third pic shows the fittings I have available. It seems like my only option is to fit a 180 on the primary and route the house above the primary rail and loop back to the secondary.

The fourth and fifth pics show one option with a 45 off the secondary that seems to fit okay (it touches a couple of the vacuum hoses a bit), but that spot is where the engine harness goes.

The last pic shows a 90 off the secondary and a longer loop in order to not kink the hose. This option stays out of the way of the wiring harness but I'm not sure if it'll get in the way of anything else. Also it does contact that coolant hose a bit and I guess that would be a bad thing over time?

Any ideas? Is anybody running this combination?

 

Really interested to see how this works out for you.

From the photos I assume you are keeping all the emmision stuff, its not simplified sequential correct?

 

That's a tough fit on a sequential car. Usually I go with the stepup kit on these applications and it still requires bending some of the lines. I recommend going simplified sequential to make more room.

 

Finally getting back to this. I decided to go simplified sequential, and so far I've blocked off the ACV and the ACV tubes.

With the ACV tubes gone, I'm wondering if there would be any issues with running a fuel hose where they used to be?
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I'd be worried having a run of that much rubber fuel hose. It's also closer to the heat from the turbos and passing by a lot of things that could rub a hole in it.

Not sure why you would need to run a fuel line all around there....


Dale

 

I'm having a hard time figuring out how to connect these two rails with the fittings and the hose that I have, with the space constraints. Should I find another way to connect them - different fittings, different fuel hose, hard lines?

 

 

Even the step-up kit was a big pain in the *** to install with stock twins
I found that switching to MAC solenoids for boost control made it easier because I could reduce the plumbing

 

I would NOT run fuel lines between the LIM and the turbochargers as shown in that photo. https://cimg7.ibsrv.net/gimg/www.rx7...a0f2b859e3.jpg

I think your photo #6 in the original post looks OK, assuming there aren't any other clearance problems.

 

Thanks for the input guys. The reason I went with this setup was to get away from running old injectors and to give myself a little more fuel for future proofing. New OEM injectors are really expensive so cost-wise it was better to go this route. My mistake was thinking that it'd be a quick drop-in replacement... I should have read up more about it!

With the ACV gone I think I can pull this off for the connection between the two rails:


I contacted FFE about the feed/return lines and they said to run hose from the rails all the way to the lines at the firewall. I wanted to reuse the hard lines on the solenoid rack but there's no way to get that working with the amount of space available. Anyways, I don't like the idea of such long runs of fuel hose just flopping around so I'm thinking of using some Adel clamps in a couple spots to help guide and stabilize the hose. Thoughts on this? I don't know what that pipe is and couldn't find it with a quick flip through the FSM...

 

That's a coolant pipe for the heater core.

 

 

 

Another long break but here I am again!

It was tough running the feed and return hoses without them rubbing on something - the top of the engine/transmission, the firewall, the heater core pipe, the clutch line (I believe that’s what it is), or themselves.

The feed line has a 45 degree fitting off the primary rail and a 90 degree fitting off the hard line. Before landing on this I tried a bunch of combinations of straight/45/90 degree fittings and the hose kept rubbing on something.

The return line has a 45 degree fitting off the pressure regulator and a straight fitting off the hard line.

I took the hose protectors off of the stock fuel hose, cut them into sections, and put them on my new hoses. They make for a tight grip for the 3/4” adel clamps, which are there to keep the two hoses from rubbing against each other. One set of clamps was sufficient to keep the hoses apart but I’m not sure how the clamp setup will hold under vibrations and etc. so I added another set of clamps to try to make it more stable.

The 90 degree fitting and the return hose at the firewall aren’t touching but they’re pretty close to each other so I’ll have to keep an eye on that.

I wasted a lot of hose figuring this out as even a small change in hose length was the difference between rubbing or not, and I had to use my soldering iron to cut the hose open to save the fittings for the next attempt. Here are my hose lengths in case it helps somebody:

Feed line: 19 3/8”
Return line: 18 1/8”

 

why wasnt doing this an option?

 

I wanted to keep the hard line for the precontrol/wastegate solenoids, and even after bending it out of the way I barely had enough room for the low-profile banjo bolt so I don't think I could get any other fittings in that space.