View Full Version : Hard line to FPR
scrubs
03-08-2023, 05:23 PM
I think this is what I have to do, but want to check with the gurus...plan to run flexible hose from fuel hard line to FPR (https://blueprintengines.com/products/efi-billet-aluminum-fuel-pressure-bypass-regulator-5-12-psi-three-eighth-inch-npt-black-bpp13205bk)...
1) I need to cut off the beautiful flare I made (along with the barbed end)
2) place a compression AN fitting to go from 5/16" to -6an male
3) get appropriate length line with -6an female on hard line side and -6an orb male on other side
Voila! Yes?
Well, since you asked...
Cheap parts are expensive! If you want a FPR that you don't have to worry about failing down the road, this is a part to consider:
Aeromotive 13130 Regulator and Fitting Kit https://www.amazon.com/Aeromotive-13130-Regulator-Fitting-Kit/dp/B07JNXSF9V/ref=sr_1_3?crid=26W8XSKCA4A1L&keywords=aeromotive+fuel+pressure+regulator&qid=1678333499&sprefix=aeromotive%2Caps%2C117&sr=8-3
MB750
03-08-2023, 07:35 PM
Personally? Ditch the hard line entirely and go -6an PTFE the whole way, tank to carb (or whatever you're using).
scrubs
03-08-2023, 07:39 PM
Personally? Ditch the hard line entirely and go -6an PTFE the whole way, tank to carb (or whatever you're using).
I have been on the fence on this...you're not making it easier...
scrubs
03-08-2023, 07:41 PM
Well, since you asked...
Cheap parts are expensive! If you want a FPR that you don't have to worry about failing down the road, this is a part to consider:
Aeromotive 13130 Regulator and Fitting Kit https://a.co/d/6lExZ5C
Appreciate the feedback, papa. This was the recommendation from BPE. I understand the conflict, but didn't think they would sell me something that would tank the motor they just warrantied.
As the post above has me thinking more about flex lines, still need to know if my plan above is ok if I stay with hard.
You didn't say what type of fuel delivery system is on your engine. BPE doesn't offer many options other than a carb or Sniper EFI. If you get the Sniper, you don't need an external FPR. If you have a carb, you need a low pressure regulator if you use an electric pump.
GFX2043mtu
03-08-2023, 10:00 PM
Honestly you have a couple choices. First buy a good regulator as they work better, last much longer and are rebuildable. Second if you use a non return regulator you’ll probably deal with vapor lock on hot days. A return style is best and will eliminate this. Fourth is the type of pump, in tank g-rotor style pumps such as a Walbro 255 or any in tank pump is superior to all other options as it lasts much longer than external pumps and has much more consistent fuel flow then a mechanical. Lastly hard vs PTFE hose. Hard line will work but you need big hard line and it’s much easier to run PTFE. If you use normal fuel line (cheaper) it will weep fuel and always smell like gas. It will also need to be changed every few years. I grew up with the stuff on our race cars as PTFE didn’t exist. PTFE is good for the life of the car. Now if you run PTFE it builds static charge, thus get carbon lined PTFE for the main runs to the regulator and from the regulator back to the tank. Not to spend your money but the truth is it costs more to settle for less only to get upset it doesn’t work, and do it right later. Places like Glenn’s performance can put together a high quality complete kit, or you could go to any other vendor and get what you need if you have specific parts in mind.
scrubs
03-08-2023, 10:12 PM
Thanks, everyone. Message received. Moving onto flex.
MB750
03-09-2023, 07:43 AM
Wise choice. I did my fuel lines three times.
1st - the FFR supplied lines. Bending the 5/16" line was a nightmare, and yes I had the mechanical bender everyone recommends. It would kink after about 45 degrees so none of my bends were nice and smooth. I also didn't like the 1/4" return size.
2nd - Nickel/Copper lines, all 3/8". Also hard to bend even though the internet says otherwise. Same issues as above, but still required transitions from hard to soft at each end anyway.
3rd - -6AN PTFE from the pickup to the carb and back. Done.
scrubs
03-09-2023, 09:01 AM
Wise choice. I did my fuel lines three times.
1st - the FFR supplied lines. Bending the 5/16" line was a nightmare, and yes I had the mechanical bender everyone recommends. It would kink after about 45 degrees so none of my bends were nice and smooth. I also didn't like the 1/4" return size.
2nd - Nickel/Copper lines, all 3/8". Also hard to bend even though the internet says otherwise. Same issues as above, but still required transitions from hard to soft at each end anyway.
3rd - -6AN PTFE from the pickup to the carb and back. Done.
Appreciate the feedback, MB750. Your build thread is impressive. Subscribed:)
Ted G
03-09-2023, 11:42 AM
I also changed up from hard lines to flex.... Just so much easier.
scrubs
03-09-2023, 12:01 PM
I also changed up from hard lines to flex.... Just so much easier.
Nail in the coffin for the hard line this AM...learned they "upgraded" me to an external electric fuel pump.
JohnK
03-09-2023, 12:03 PM
Just to offer a counterpoint, count me among those that prefer hard lines. I ran 3/8" stainless steel lines for supply and return, with short sections of SS braided PTFE line for the final connections. The risk may be minimal, but I feel more comfortable with hard line running along the 4" tubes where it's susceptible to road debris hitting it. Stainless steel was purely an aesthetic choice. Nicopp is just as good, much easier to work with, and a fraction of the cost of SS. Running hard lines is more involved, takes some planning, and there's a bit more of a learning curve, but if I can do it anyone can. Just buy a roll of cheap nicopp to play with and learn, and when you have your technique down then go for it. Nicopp is very easy to work with, with the proper tools. Just my $0.02 FWIW.