EFI stainless steel hardline project
 

I got the bug to take on ditching my braided ss lines for hardlines. Will be running a 5/8 feed and a 1/2 return. Bought imperial eastman benders and a Ridgid 37* flaring tool.

My q's are will. 035 wall seamless annealed ss tube work for both of my sizes? The 1/2 bender has a 1.5" radius and the 5/8 bender has a 2.25" radius.

Are there issues using aluminium tube nuts, sleeves and fittings with the ss ine?

I think the .035 wall tube will be fine... but you might want to consider aluminum tube, rather than SS. Aluminum has a bunch of advantages:

1. Lighter
2. Easier to bend
3. Conforms better to seal surfaces, so it leaks less
4. Has a higher coefficient of heat transfer (mu), so heat in the gas can radiate

Some dislike aluminum due to its lower strength and the notion that it can be "punctured" from road debris, or because of a worry about work hardening.

All these issues are valid to some degree, but aluminum has plenty of strength for fuel pressure, and has less of an issue with work hardening than SS. I'll leave it to you to consider the odds of a rock hitting your aluminum fuel tube and causing it to leak, but not so hard that a SS line wouldn't leak too. I think those odds are extraordinarily low... but it's not zero.

Doea aluminum need to be double flared?

No. Use 37* flares (AN / JIC) with sleeves and nuts.

Who makes the nice billet mounts that hold 1/2 and 5/8?

<----- JCG or Ironworks maybe?

I'll second aluminum over SS. The SS is a pain to bend and flair. If you are worried about damage to the aluminum fuel line, it's easy to make good looking covers to hide the more exposed sections. Also, take in to account the route you take from tank to engine. It doesn't have to follow the factory routing. The more protected the fuel lines the better no matter what material you choose to utilize. Good luck.

Here is a thread on Stainless Steel tube bending.. Mark from www.bentcustomandperformance.com started the thread, so you might want look at it.

https://lateral-g.net/forums/showthread.php4?t=28726

Jeff

Just curious why you are running those sizes?

I have run this configuration in braided ss for years with great success. Im really afraid to make a change at the risk of damaging my combo. This is a supercharged engine making approximately 1100-1200 hp. Using a magna fuel 750 protuner pump.

What wall thickness do you use jp?