Fuel Pressure Regulator Location?

[mmklaxer]

I know many people are putting their regulators on the 2X2 cross frame under the firewall with a custom bracket to give spacing for the Coyote power harness to run behind it.

Any reason I'll be in trouble putting the regulator on the passengers footbox as depicted below? Curious if I'll run into an interference issue later on when dropping the engine in? I've seen others ask the question, but couldn't find a concrete response. Thanks!

173787

[toadster]

with a coyote I think that would fit just fine, it's a much shorter block front to back than a regular 351 setup
maybe hard to read, but it's not something you'll adjust every day either :)

[Al_C]

Judging from your photo, I'd say the answer is no. The engine is going to take up most of the space by the PS footbox all the way forward to the angle. To put it in perspective, I initially did a trial fit on my engine when there were still clecos in the footbox aluminum and they were in the way.

My suggestion is that you mount the regulator on the firewall, but install an elbow on the pressure gauge so you can read it without a mirror.

[mmklaxer]

Thanks all!

[Lidodrip]

Plenty of room with a Coyote.

https://thefactoryfiveforum.com/attachment.php?attachmentid=173794&d=1665870463

James

[edwardb]

Keep in mind that where you place it not only needs to clear the engine and related, it should also not be in the way for assembly and ongoing maintenance. The firewall is a much better location IMO. If you're going to put it in the engine compartment Which I did on the two Coyote builds I've done.

Here's another idea: A bunch of guys have used the fixed pressure GM regulator/filter on their builds and installed them back by the tank. Makes the return line very short and you only have to take a single supply line up to the engine. That specific regulator is the wrong pressure for what's recommended for the Gen 3 Coyote. But why not put the adjustable one back by the tank? That's what I did on my truck build. Not a Coyote, but still with the same EFI regulated requirement. Made plumbing the fuel system much simpler and I'd do it again if I have the chance. Granted, the gauge and adjustment aren't handy. But my experience with driving multiple years in my Coyote Roadster and Coupe with Aeromotive adjustable regulators is once set I haven't touched them for multiple driving seasons. Something to consider.

[mmklaxer]

Thanks Paul! Can you expand a bit more on why this is not the right Fuel Pressure Regulator? In the FF Gen3 Coyote instructions, it calls out the AEI 13129 regulator, which is what I have (I bought the 13130 kit which includes the gauge and hardware). Says pressure is good from 40-75 per summit racing, and my google search returned that the Gen 3 Coyote should run at 65psi. If my research missed something, I wouldn't be shocked. I just want to understand what I should be looking for.

A fixed pressure regulator would make it easier for a fuel line perspective, for sure.

[edwardb]

Thanks Paul! Can you expand a bit more on why this is not the right Fuel Pressure Regulator? In the FF Gen3 Coyote instructions, it calls out the AEI 13129 regulator, which is what I have (I bought the 13130 kit which includes the gauge and hardware). Says pressure is good from 40-75 per summit racing, and my google search returned that the Gen 3 Coyote should run at 65psi. If my research missed something, I wouldn't be shocked. I just want to understand what I should be looking for.

A fixed pressure regulator would make it easier for a fuel line perspective, for sure.

The regulator you have is fine. As long as it fits into the required range for the Gen 3 Coyote, which yours obviously does. All I'm saying is another option for the regulator placement (the one you have...) is back by the tank. Same as a bunch of guys did with the fixed regulator that worked for previous Coyote versions. Granted it's not convenient to monitor and adjust. But as I said, my experience is once set it doesn't change. The inconvenience is maybe less than the effort to run both supply and return lines to the engine compartment. Just another option to consider. Don't overthink it. If you don't like the idea, then ignore the suggestion. Sorry if my response was confusing.

Now having said that, I've seen some posts where guys question having the regulator that far from the engine fuel inlet/fuel rails. Doesn't take into account the pressure loss that may occur through 10-12 feet of fuel line. I'm not a fluid engineer so don't have the knowledge to calculate what the loss might be. My guess is it's insignificant and based on experience, it works for these builds and seems to have worked for GM in Corvettes for a number of years. My sense as well is that the Coyote, especially in stock form, isn't super critical on the pressure. Set at 65 PSI and tuned from that setting I'm confident it will run just fine.

[mmklaxer]

The regulator you have is fine. As long as it fits into the required range for the Gen 3 Coyote, which yours obviously does. All I'm saying is another option for the regulator placement (the one you have...) is back by the tank. Same as a bunch of guys did with the fixed regulator that worked for previous Coyote versions. Granted it's not convenient to monitor and adjust. But as I said, my experience is once set it doesn't change. The inconvenience is maybe less than the effort to run both supply and return lines to the engine compartment. Just another option to consider. Don't overthink it. If you don't like the idea, then ignore the suggestion. Sorry if my response was confusing.

Now having said that, I've seen some posts where guys question having the regulator that far from the engine fuel inlet/fuel rails. Doesn't take into account the pressure loss that may occur through 10-12 feet of fuel line. I'm not a fluid engineer so don't have the knowledge to calculate what the loss might be. My guess is it's insignificant and based on experience, it works for these builds and seems to have worked for GM in Corvettes for a number of years. My sense as well is that the Coyote, especially in stock form, isn't super critical on the pressure. Set at 65 PSI and tuned from that setting I'm confident it will run just fine.

This is very helpful, thanks again. All feedback is welcome! I may take a look at a rear location and see if I can’t find something that works!