Location for coyote pressure regulator

[topherchrisb]

Hey Everyone, making sllloooowww progress on my kit... but it is progress. I'm trying to wrap up fuel line routing so I can do some pressure testing and be completely sure about my hard line configuration. I searched around trying to find locations used for pressure regulators on coyote setups and determined the general consensus is the lower middle portions of the firewall. In the picture below it's hard to tell but that is the extended firewall option that ff metal offers. I'm saying that because going back any further puts the adjustment screw under the firewall. Probably not a big deal if I lower it down some but I was trying keep it tucked up in the foot well as much as possible for any hardware sticking through. Am I missing something when considering this location? I want to leave as much of that firewall open for the idea that I'll be installing a heater or even a AC/Soft top combo in the future.

https://thefactoryfiveforum.com/attachment.php?attachmentid=172562&d=1663351806

[BEAR-AvHistory]

Put mine in the center of the firewall. Its not accessed much once the car is set up but you want to leave clearance to get to the pressure adjuster at the top. Pressure can change as it gets older, or you make modifications. Adjuster turns with a hex-key.

https://thefactoryfiveforum.com/attachment.php?attachmentid=172565&d=1663357269

Things can change over time so you need to try to future proof the car.

https://thefactoryfiveforum.com/attachment.php?attachmentid=126382&d=1586814394

[Railroad]

You might have to put a 90* fitting on the gauge to read it. Other than that, it looks doable.
Here is a pic of mine. If it helps.
172566

[toadster]

i'm looking at the same location to be honest, too much crap on my firewall... pretty sure it will clear - as mentioned above a 45 or 90 degree bend to read the gauge easier may help

[Rdone585]

I would wait until the engine is mounted, or at least mocked up in the chassis. The other pics in this thread show theirs on the firewall. Mine is also on the firewall. That spot is really close to the valve cover at the rear of the engine. It could also make the spark plug in cylinder 4 harder to access. You might also want to keep all the fuel lines, regulator, etc. away from the headers as much as possible to keep the fuel as cool as possible.

[JohnK]

Here's an overhead shot of mine. It's mounted on the firewall, as others have done, but it's mounted on a custom bracket that moved it forward an inch to allow the coyote wiring harness to pass behind it. In the photo you can see that there's a good amount of open space in the area that you're considering mounting yours, especially if you use the provided mounting bracket that sticks out a lot less. I have no idea, however, if the gen3 coyote has additional "stuff" in that area vs. my gen2 so verify that beforehand.

Also worth noting, I have heard that it is not recommended to leave the gauge mounted on the pressure regulator permanently as it can be a source of leaks and fire. I believe it is recommended to remove the gauge and plug the hole after setting fuel pressure.


https://thefactoryfiveforum.com/attachment.php?attachmentid=152611&d=1629842479

[Alan_C]

While my application is not for a MK4, here is where I put the regulator on my Coyote powered Mustang restomod. I placed the regulator pretty much in line with the DS fuel rail. It just worked well with the planed layout of my fuel lines.
There is no perfect answer here, often the location is dictated by placement of other components, like the PDM shown in one of the pictures. Do what you think works the best for your engine compartment. The pressure gauge should only be a temporary install. Many have discussed the possibility of them failing and leaking. With 50 plus PSI, I would not want a fuel leak as the headers are not far away.

https://i.imgur.com/2mDFZJBl.jpg

[edwardb]

I would recommend not finalizing a site until you have more of the components located. Heater, wipers (if used), the Coyote PCB, master cylinder reservoirs, your engine harness, and ideally the engine itself. So many decisions and locations interact it's best to mock up as much as possible in advance. You have the fuel lines coming up similar to how I did mine. You can route the flex hoses from there to most anywhere in the firewall area. The fuel inlet on the engine itself is on the left side as you probably know. While viewing the gauge is important at first to get the regulator set, I've found once set it doesn't change. My Coupe regulator hasn't been adjusted since the initial setup and tune and it's still exactly right. That was three driving seasons ago. I took the gauge off and put in a plug. Engine mounted gauges are often cited as a safety concern so recommended to remove after setup. Maybe not so much with a firewall mounted gauge, but I took the same advice.

[Al_C]

I am currently struggling with mine. It is mounted on the firewall and the PS cylinder head has the best view of the gauge. As long as you don't have interference with anything in your desired location, put it there. If I were to do it again, I would put an angle pipe on the gauge so I could read it.

[topherchrisb]

Put mine in the center of the firewall. Its not accessed much once the car is set up but you want to leave clearance to get to the pressure adjuster at the top. Pressure can change as it gets older, or you make modifications. Adjuster turns with a hex-key.

Things can change over time so you need to try to future proof the car.



Yeah leaving the firewall as blank as possible seems to me like it could be very beneficial in the future with upgrades. Both the new coyote gen4 intake with dual throttle bodies and the new cobra jet intake have caught my eye in the last couple days.

[topherchrisb]

Here's an overhead shot of mine. It's mounted on the firewall, as others have done, but it's mounted on a custom bracket that moved it forward an inch to allow the coyote wiring harness to pass behind it. In the photo you can see that there's a good amount of open space in the area that you're considering mounting yours, especially if you use the provided mounting bracket that sticks out a lot less. I have no idea, however, if the gen3 coyote has additional "stuff" in that area vs. my gen2 so verify that beforehand.

Also worth noting, I have heard that it is not recommended to leave the gauge mounted on the pressure regulator permanently as it can be a source of leaks and fire. I believe it is recommended to remove the gauge and plug the hole after setting fuel pressure.


https://thefactoryfiveforum.com/attachment.php?attachmentid=152611&d=1629842479

That's a great overhead shot of why I was thinking that location in the first place. It seems to me like you have a lot of space in that corner in this top down view shot. Making it so the gauge points towards the driver's foot box seems like it would provide enough angle of attack to view the gauge from the driver's side of the engine easily. I also was unaware it is recommended to remove the gauge after it's set. I have typically been focused on pictures of engine bays during the build process when the gauges is almost always there and haven't paid as much attention to post build engine bay pictures where it would be removed. Good advice, thanks.

[topherchrisb]

I would recommend not finalizing a site until you have more of the components located. Heater, wipers (if used), the Coyote PCB, master cylinder reservoirs, your engine harness, and ideally the engine itself. So many decisions and locations interact it's best to mock up as much as possible in advance. You have the fuel lines coming up similar to how I did mine. You can route the flex hoses from there to most anywhere in the firewall area. The fuel inlet on the engine itself is on the left side as you probably know. While viewing the gauge is important at first to get the regulator set, I've found once set it doesn't change. My Coupe regulator hasn't been adjusted since the initial setup and tune and it's still exactly right. That was three driving seasons ago. I took the gauge off and put in a plug. Engine mounted gauges are often cited as a safety concern so recommended to remove after setup. Maybe not so much with a firewall mounted gauge, but I took the same advice.

Yeah it seems I have too much still up in the air to finalize the location. I think I can safely say I want to match the 45 degrees on each hard line in the engine bay and make them the same length for esthetic reasons at this point. That should give me enough confidence of the hard line locations to put the ANs on and allow me to do the compression test through that location.

Thanks for all the responses everyone!