Stainless Steel PTFE Fuel Hose Routing from Frame to Engine Bay Question

[AndrewIdaho]

As I mentioned in my build thread, I am doing initial trial fitting of the AN-6 Stainless Fuel Lines. I am concerned that the lines droop too low on the frame as they enter the engine bay. This was done to ensure that the lines did not rub against the foot box corner while maintaining the required bend radius (~3").

Engine Bay View: 214839

Frame View: 214840

So I have a few questions:

Am I overthinking this and is what I have is fine?

If there are potential issues, the cleanest solution I can think of is to cut the lines and add fittings to allow 90 Degree Male-Male AN-6 adapters to be used there by reducing the bend radius. Does this seem problematic? If so, other suggestions?

My thanks in advance for any guidance you can provide.

Best Regards, Andrew

[cv2065]

Personally I’d have them tighter against the frame with zero movement to protect as much as possible The key to that is using quite a few SS hose clamps. I think I tapped a 10/32 SS screw and clamp every 7 inches or so for both feed and return lines and it kept them fairly tight. I did it with -8AN lines. Easier with -6AN. You can check it out on my build thread if you like. Starts at Post #63 on Build Thread #2. I don't think you need to cut any lines. That's the nice thing about using PTFE is that it is a straight run with no junctions.

[JMD]

Mine is similar but I would probably do as cv said and add a clamp closer to the radius to pull it up just a hair, or at least better secure it where it sits. It's probably fine the way you have it, but the less loose line sticking out to get snagged the better. The stainless braided jacket will keep it from chafing against the rolled aluminum edge so don't worry about that. If anything the aluminum edge will deform or wear away before the stainless weave will. As long as the line isn't kinked it will flow fine.

[michael everson]

I personally just run them up the tunnel. Out of the way of most road debris hitting them. If your worried about having fuel that close to you, keep in mind most people mount the regulator right on the fire wall. Also on the Mark 5 and Daytona, there is no other option.
Mike

[AndrewIdaho]

Hello Mike, JMD and cv,

Thanks for the prompt responses with your insight. It is these responses that make this group such a valuable resource for newbies like me. Mike, while your recommendation intrigued me, I cannot envision how I would get the fuel lines as well as all the extra electronics cabling (Electronic Parking Break, Speakers, Heated Seat, Battery power) run as well as what tradeoffs would be need to be made to make it happen. This afternoon, I followed JMD's and cv's recommendation to add an additional clamp just as the fuel lines lines transition into the engine bay. The following are the photos of the result.

Frame View:
214861

Engine Bay View:
214862

Overall I believe that this resolves my concern and I am going to proceed along this path.

Let me know if you see something of concern and again thanks for your comments.

Best Regards, Andrew

[JMD]

Looks good to me. I don't think you will have any problems with that. Keep it up!

[Fman]

Andrew, for some peace of mind for you I have mine mounted in the same location. My car has been on the road now for 4 years, 7600 miles and zero issues with them on the side of the frame. One item I would recommend is adding an outside sheathing (rubber hose) where the stainless lines will come in contact with any corners. This will help eliminate possibility of anything wearing into the hose over time. I tossed in a couple other pics of how I ran the entire lines front to rear.

https://thefactoryfiveforum.com/attachment.php?attachmentid=135058&d=1600143200
https://thefactoryfiveforum.com/attachment.php?attachmentid=135059&d=1600143214
https://thefactoryfiveforum.com/attachment.php?attachmentid=135057&d=1600143187
https://thefactoryfiveforum.com/attachment.php?attachmentid=135056&d=1600143174

[M22_COBRA]

FWIW I put a Pclip right at the corner so it can't hit. Yes your not supposed to use them in this orientation, but I don't care it's not to hold the line. It's to stop it from rubbing. I'm also running a single-6 forward and using the combination fuel filter regulator from aeromotive
214996 214997 214998 214999 215000

[Nickjj]

Looks exactly how I ran my PTFE lines. Although I would suggest that where the lines turn up into the engine bay slit about 6" of rubber fuel line, and zip tie it to the PTFE so that it doesn't rub on the corner of the radius bend of the footwell. Better to have a little protection on the stainless braid.

[JMD]

Looks exactly how I ran my PTFE lines. Although I would suggest that where the lines turn up into the engine bay slit about 6" of rubber fuel line, and zip tie it to the PTFE so that it doesn't rub on the corner of the radius bend of the footwell. Better to have a little protection on the stainless braid.

Using rubber fuel line to protect is always a good idea, but the stainless braid isn't really going to need any protection. Whatever is rubbing on the stainless braid is what's going to need protecting...

[cv2065]

Looks exactly how I ran my PTFE lines. Although I would suggest that where the lines turn up into the engine bay slit about 6" of rubber fuel line, and zip tie it to the PTFE so that it doesn't rub on the corner of the radius bend of the footwell. Better to have a little protection on the stainless braid.

The lines shouldn't be moving. If they are to where they are causing an abrasion, then the design and security of the line needs to be addressed.

[AndrewIdaho]

The lines shouldn't be moving. If they are to where they are causing an abrasion, then the design and security of the line needs to be addressed.

With the added clamp as shown in post 5 of this thread the lines do not move in the transition to the engine bay. Thanks Andrew

[CDXXVII]

I prefer to run stainless steel hard lines and used ptfe stainless braided for final connections. You should be fine with your setup, hard lines are just my preference.

https://thefactoryfiveforum.com/attachment.php?attachmentid=82790

https://thefactoryfiveforum.com/attachment.php?attachmentid=82791

https://thefactoryfiveforum.com/attachment.php?attachmentid=82792

https://thefactoryfiveforum.com/attachment.php?attachmentid=82794

[Mike.Bray]

I'm with you on the hard lines!

[Dondero14]

I prefer to run stainless steel hard lines and used ptfe stainless braided for final connections. You should be fine with your setup, hard lines are just my preference.

https://thefactoryfiveforum.com/attachment.php?attachmentid=82790

https://thefactoryfiveforum.com/attachment.php?attachmentid=82791

https://thefactoryfiveforum.com/attachment.php?attachmentid=82792

https://thefactoryfiveforum.com/attachment.php?attachmentid=82794

I'm amazed at how beautiful those lines look. Absolute work of art there. Very nice job.