Coyote Fuel Line Routing

[Mbufford]

Hello all!

I’ll be getting my Gen2 Coyote long-block delivered from Promar in the next couple weeks and will be ready to jump straight into building it out.

As to the fuel lines, I’ve seen two arrangements used, and looking for insight as to which is better for our purposes, if it even matters:

1. From pump to regulator, with the return going back to the tank, and then a single line to the fuel rails with the end plugged.

2. From pump to fuel rails, from fuel rail to regulator, and then return to the tank.

Any benefit of doing one over the other?

[michael everson]

on the GEN 1 and 2 I use the Corvette filter/ regulator and then run a 3/8 cloth braided line (FFR supplied) through the top left of the tunnel and to the engine. Simple clean setup with a very short return line from the filter.
Mieke

[Mbufford]

Thanks for the reply. I’m talking more specifically about the attachments to the rails—I already have my Aeromotive pump, canister filter, and regulator installed with the send and receive lines already installed and connected.

That’s why I ask the rails question: it would be easier for me to simply run a line from the reg to one of the rails and plug the other end. But, if there’s any benefit to it, I can reroute the supply line to the rails and add a line to the regulator at the other end.

*edited to add that I have aftermarket rails, not the OEM setup. So, I have flexibility on how it can be installed.

[edwardb]

Confused by your question. I've done stock Gen 2 and Gen 3 Coyotes crate motors and there's only one fuel rail connection. And it's not even on the rails. It's on a rigid line that's connected to the two rails. One line from the regulator to that connection. Do you have an aftermarket setup or something that's been modified? I don't have a good picture of the Gen2 build. But this picture is a Gen 3 which is nearly the same. The fuel line isn't run, but the red cap on the regulator and the red cap on the RH fuel inlet next to the fuel rail is also visible. Yours is different than this?

https://thefactoryfiveforum.com/attachment.php?attachmentid=98346&d=1543447300

[Mbufford]

Confused by your question. I've done stock Gen 2 and Gen 3 Coyotes crate motors and there's only one fuel rail connection. And it's not even on the rails. It's on a rigid line that's connected to the two rails. One line from the regulator to that connection. Do you have an aftermarket setup or something that's been modified? I don't have a good picture of the Gen2 build. But this picture is a Gen 3 which is nearly the same. The fuel line isn't run, but the red cap on the regulator and the red cap on the RH fuel inlet next to the fuel rail is also visible. Yours is different than this?

https://thefactoryfiveforum.com/attachment.php?attachmentid=98346&d=1543447300

That’s exactly the scenario—I edited my last comment to include this. I have aftermarket rails, which basically just have -10an orb ports on each end with the injector openings at the bottom. So, I can set the fuel system up for whatever would be optimal. This photo isn’t great—it’s right after I powder coated them, so there’s still a silicone plug in one of the ports, but it gives the idea.

211454

[michael everson]

you are going to have to T the pressure line to feed both rails or run the fuel into one and run a line between the rails and cap one end.
Mike

[Blitzboy54]

I have a gen 2 and did what most do (including Paul). If I was to do it again I would put the regulator back by the tank and run a short return there just past the filter. Then run one single supply line under the car directly to the engine. Just cleaner and makes an already busy engine bay a little less cluttered.

[edwardb]

I have a gen 2 and did what most do (including Paul). If I was to do it again I would put the regulator back by the tank and run a short return there just passed the filter. Then run one single supply line under the car directly to the engine. Just cleaner and makes an already busy engine bay a little less cluttered.

I agree. Did my first Coyote builds with the regulator on the firewall. But put it at the back with the truck build and would do it that way again. Said so in this recent post: https://thefactoryfiveforum.com/showthread.php?50796-Fuel-pressure-Regulator-Location-(Gen-3)&p=574877&viewfull=1#post574877.

[M22_COBRA]

I took the info above into serious consideration and moved mine to the rear on my gen3 I'm currently assembling. I tried to get the Trick flow and Aeromotive parts but the delay was HUGE. I ordered the trick flow from summit in Oct 24 and it arrived last week 3/27/25. Needless to say I didn't wait. I stumbled on a new product from Aeromotive which is a filter and regulator combo. Fits nicely in the back and if it leaks there is nothing to drop fuel on other than the concrete. Fingers crossed it works out for first start. I'll have to set the pressure which might be harder than usual but once its set I should never have to touch it again. It was actually a little cheaper as I removed a set of AN fittings (and a leak point)
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[Blitzboy54]

That’s really slick.

[Mbufford]

I wish it wasn’t too late for me to do that! But, other than the short run to the rails, my system is complete already and I really don’t want to disassemble it and leave holes that I have to plug.

But yeah, from what I’ve seen that makes for a very clean setup, and I will absolutely go that route on my next build.

[toadster]

agree that's a slick setup!