Fuel regulator positioning.

[nick7405]

The fuel regulator I have is significantly bigger then the supplied ffr one. I want to mount it on the firewall shown below and approximately one inch of the firewall to account for the coyote harness. Is this location going to be an issue. It will be approximately 5 inches off the firewall. Any other recommendations? 123714
123715

[phileas_fogg]

I have no knowledge of the Coyote or it's fitment, but there are a couple of other considerations about which you might want to think. The first one is to consider your fuel line routing. Check for interference with the heater (if you have one) and the bell housing, accounting for space to take the lines loose for maintenance. Second, if you ever want to install a fuel pressure gauge or sensor on the front of the regulator, be sure you leave enough room for that. Both of these considerations may lead you to install the regulator higher on your firewall.


John

[Bob Cowan]

For a number of reasons, that's not a good spot. Needs to be more accessible. Mine is on the driver's side.

[nick7405]

For a number of reasons, that's not a good spot. Needs to be more accessible. Mine is on the driver's side.

Do you have a picture of where you mounted?

[Ducky2009]

I have a Gen 2 Coyote and my regulator is positioned in the same place that you're suggesting. My regulator has an L bracket (that I made) that allows the chassis wiring harness to lay behind the regulator (approx 1" clearance). The regulator, including gauge, sticks out approx 5 1/4" from the firewall. The pics shows the engine wiring near the face of the gauge. If I move the wires, I have enough room the slide my fingers between the face of the gauge and the engine. NOTE: I have a 45 degree fitting on the gauge, slanting the face upwards, making it easier to read the pressure. Without the 45 degree angle fitting, the setup would be about 3/4-1" shorter from the firewall.

NOTE: I installed the regulator AFTER installing the engine.

[BEAR-AvHistory]

Mine is a Gen 1 & its mounted high in the middle of the firewall. Height reference would be the fuel line from the regulator to the engine is level


https://thefactoryfiveforum.com/attachment.php?attachmentid=123732&d=1583602506

[nick7405]

Thanks everybody for the feedback, I did move the regulator to the drivers side as shown. Hopefully no issues
123733

Only thing I don't like is how flimsy the passenger foot box is with the hoses on them. I'll buy some strip and attach it from inside the box for support

[nick7405]

Do you guys think the angle on the return line is excessive and needs to be redone? I have ordered another 45 deg an fitting
123783

[edwardb]

Angle on mine also showing location. Works fine three seasons approaching 7K miles.

https://hosting.photobucket.com/albums/ab234/edwardb123/Factory%20Five%2020th%20Anniversary%20Mark%204%20R oadster/Fuel%20and%20Brake%20Lines/.highres/IMG_3938_zpsjg253fnq.jpg (https://app.photobucket.com/u/edwardb123/p/6e7b25f0-84eb-41ea-af21-f4701af93551)

[nick7405]

Thanks, I guess I'll let it be for now.

[canuck1]

Mine's not a Coyote but I have my FPR mounted in similar location (maybe a bit lower, actually) and if I can make a general recommendation, it would be to swap the gauge out for a schrader valve and use a testing gauge (with hose extension and connection adapter) when you need to check or monitor fuel pressure. I tried both a dry and liquid filled gauge permanently mounted to my regulator for a few years but found that both units were susceptible to heat soak and not as accurate as I'd like as a result. I got the best (most consistent) results from my OTC fuel pressure testing kit gauge. The rubber-bodied gauge is perfect to lay on the windshield facing the driver so you can read it from the driver's seat while testing in the garage by yourself.

Just trying to share my own experience.

Sean

[karlos]

Mine's not a Coyote but I have my FPR mounted in similar location (maybe a bit lower, actually) and if I can make a general recommendation, it would be to swap the gauge out for a schrader valve and use a testing gauge (with hose extension and connection adapter) when you need to check or monitor fuel pressure.

Good advice, Sean. I made the same changeover due to a pressure gauge that failed as I was motoring down the street one fine day. Heard the faint sound of pressure being released and was immediately hit with the strong smell of gasoline. Fortunate that I was able to immediately pull over and shut the car down before an engine fire occurred. Had the leak been directed at the exhaust header I believe it could have been a far different outcome.

The gauge was initially mounted to the regulator to make it easy to set the fuel pressure during the first start. Never had to adjust the regulator again afterward, but I left the gauge there anyway. What I've since learned is that certain gauges are prone to fatigue failure of the internal Bourdon tube due to the pressure fluctuations produced by the fuel pump. Reportedly a bigger problem for the dry-style gauge as opposed to the fluid-filled gauge, as the fluid tends to damp the oscillations. My leaking gauge was fluid-filled, and although I can't say for sure it was a fatigue failure, it most likely was. In any event, it was a close call brought about by leaving a gauge in place that really wasn't serving any useful purpose.

As you suggest, a better approach is to use a fuel-rated Schrader valve instead and only connect a test gauge when you need to take a measurement. Here's one source for fuel injection rated Schrader valves: https://www.dieselorings.com/schrader-valve-fuel-injection-rated-1-8-mnpt.html

Summit stocks AN adapters with a port that will accept such a valve, and which will fit the 9/16 NPT threads in the end of a standard fuel rail. See pictures below. Much happier with this setup, as checking the fuel pressure is relatively hassle free and the risk of a fuel leak inside a hot engine compartment is reduced.


https://thefactoryfiveforum.com/attachment.php?attachmentid=123922&d=1583892599


https://thefactoryfiveforum.com/attachment.php?attachmentid=123921&d=1583892583

[canuck1]

Wow! That's one of my worst nightmares Karlos!! :eek:

I've heard stories about fuel pressure gauges being a failure point but never experienced it myself, so I didn't want to point to the possible safety issue without first hand knowledge.

I like that fitting on the rail, very OEM functional. I screwed my schrader valve directly into the extra port on my regulator. The flexible hose on my OTC brand testing gauge is long enough to reach from there to my windshield. It actually makes testing and adjusting fuel pressure easier than having a gauge mounted directly on the regulator and I'm much more confident the values are reliable. Like most, once pressure is set, I've never needed to look at it again unless trouble-shooting a related mechanical issue.

Sean