There is nothing wrong with ptfe lines all the way. Heck flex lines are used to plumb an aircraft's entire fuel system. They're more forgiving to vibrations, easy to service and ptfe is even more fuel resistant ans traps vapours better than copper/nickle.

 

I don't even use ptfe I just use regular Vibrant line.

 

You did a really nice job with running those hard lines. They look really good. I switched to a Weldon a2040 afpr and it does a real nice job. I know with the smaller fuel lab somes they just don't do the job. I couldn't get one to hold pressure correctly and the other one I had worked for about a week and stopped working all together. Went to the Weldon few years ago never a problem. Take a look into those there pretty sweet. The id f1250 is a really nice unit as well. Should would really nice in your setup.

 

That looks super clean. I was trying to do that but those line holders gave me issue so Zip ties it is for now.

 

Yeah, they are perfect functionally. The reason I went with hardlines is because it’s cheaper than high quality conductive ptfe hose and how it can do turns that ptfe or regular braided rubber hose cannot. I also like how it looks as well haha.

I did consider vibrations and work hardening as well so I am only going to run hardline in ridgid parts where they won’t move and are properly braced.

I am not sure if copper nickel will emit odors or not but I believe it won’t if the lines are properly flared. I had some regular braided hose on this car from the previous owner and it started to smell like E85 under the car near the lines since the car sat over winter with fuel in the lines. If it was all PTFE I probably wouldn’t have changed anything except the fuel filter.

 

Thanks. I have a radium direct mount regulator on the car at the moment. It’s very compact but it supposedly flows 1500LPH which is 2x more than needed for ~900whp on E85. I am not sure how true Radium’s claims are but I will test this once I have my block built next winter. I also have an Aeromotive A1000 that’s similar to the Weldon. I’m going to use the Aeromotive if the Radium one doesn’t work.

As for the fuel filter I decided to run with the ID F750 since it’s a bit more compact width wise and I am running out of space. It’s really pricey for a fuel filter though

 

Thanks, I’m glad it paid off. It was pretty annoying to install and shape them on jack stands though. As for line holders I modified them by removing the white plastic inserts that are made to fit the smaller OEM lines. The lines just kind of sit there on the slots with removed inserts. I am probably going to ziptie them to the holders to keep them from shaking.

 

That is good to know. I got tired of being under the car on the cold dark floor. Maybe next year i will look into a better solution.

 

I’ve been quiet for awhile because I only had an hour or 2 after work to work on the car, but I’m glad to say that the the fuel system is basically complete minus one fitting. So here’s the parts list:

FUEL PRESSURE REGULATOR:

• Radium Direct Mount Regulator RA

MISC:

• Injector Dynamics F750 fuel filter
• Radium Split Flow Flex Fuel sensor adapter
• GM/Continental flex fuel sensor
• Fuel pressure sensor
• Fuel pressure gauge

FUEL LINES:

• 1/2”(-8) Copper Nickel hardline
• 3/8”(-6) Copper Nickel hardline
• -8 Fragola 6000 series PTFE hose
• -6 Fragola 6000 series PTFE hose

STUFF I KEPT CAME FROM PREVIOUS OWNER:

• Injector Dynamics ID2000 fuel injectors
• Aeromotive fuel rail
• BPR double pumper with 2 Walbro 525 fuel pumps

Like I mentioned in my previous posts, I will be running -8 feed and -6 return for my fuel lines. I determined that it will be adequate for my future goal of 950whp on E85.

I ran a mix of hardline and flexible PTFE hose throughout the entire fuel system. I will say that I of regret cheaping out with the Fragola 6000 series PTFE hose. It is a lot more ridgid than I would like. If I were to start over, I would have gotten some convoluted PTFE hose for the extra flexibility.

Overall, the trickiest part was definitely routing the hardlines since they required a lot of trial and error to run correctly especially in the engine bay. If I messed up a measurement or bend, I would have to start over with new lines since they couldn’t be un bent without damaging them.

I also had some minor difficulties mounting the fuel filter and flex fuel sensor since it required a custom bracket, but it was no where near as hard as routing and bending hardlines.

I will post the photos on the next post.

 

On the feed side I used PTFE hose from the fuel hanger to a hardline that runs from the back of the car all the way to the fuel filter. The fuel then goes to the flex fuel sensor and rail. I chose to mount the fuel filter and flex fuel sensor in the empty space where the OEM hardlines were.

To mount the fuel filter and the flex fuel sensor I made a bracket out of 1/8” thick 5052 aluminum sheet. There were only a few bends required in the bracket so that made life easier. I also used some AN fittings to connect the fuel filter to the ethanol sensor.


Fuel filter and flex fuel sensor location

Closer view of the hardline to the fuel filter and the hardline for return right under the flex fuel sensor

On the return side, I used a hardline going from the Radium Direct Mount Regulator to the end of the intake manifold parallel to the fuel rail. I will brace the hard line with 2 P-clamps so it doesn’t crack over time.


Fuel return line from the regulator

Top down view

Close of of Radium FPR with gauge

PTFE hose was then used between the intake manifold and hardlines. I am only missing a 45 degree PTFE hose end for the return line. The current 60 degree hose end made the return line rub with the heater core coolant hose.


PTFE hoses to the rail/intake manifold with the return line not cut yet

Once I finish the last fitting and brace for the return line, I will remove the intake manifold to get it powder coated gloss black. I will also finish trimming the bracket for the fuel filter and flex fuel sensor and maybe get those powder coated black too.

Bonus picture of the downpipe I made at the same time. Goes from 3” at the turbo to 3.5” where it meets the midpipe. I will finish welding it once I refill my argon tank on my TIG welder.

Downpipe tacked and ready to be welded