Can I get in trouble with tech / NHRA rules for having more than 12'' of rubber fuel line in the engine bay? I've heard this may be the case... I need to reroute them because they are too close to my headers and I'm getting vapor lock... I can't really find any "good" place to run them... this is pissing me off......

 

I have never had anyone actually check that. I suppose if the tech guy is ****, or you have a really fast car, that they will say something. Im sure though if you have 5 feet of rubber hose spiraled up and laying on the intake they will say something.
Try putting some insulation on the hard line, they make stuff for that.

 

Does the rule book say anything about the use of braided hose ?

You might can get some Russell Proflex, and not lose sleep.
If you got a few extra bucks use the AN fitting, but let me warn you! These fitting, and hoses get addicting to use, and will make you bankrupt in no time

If you’re not in the mood to deal with braided lines, or fittings you can get some aluminum line, and use couplings.

Ron

 

sure will, 12" is the max. i've never saw anyone get bounced in the inspection for being 1/4" over, but i have seen guys not pass tech for having too much rubber line, like 16" in one piece. use the braided steel and you'll be ok.

 

I have 4 feet of rubber fuel line on my car. 2 feet for feed and 2 for return hooked up to the harline that goes into the fuel rail.
I'll eventually replace it with hardline.
I hope they don't say anything at the track next month since my car isn't all that fast.

 

rubber line with ~46 LBs of fuel pressure. I wouldn't trust it.

 

In the engine bay area, I would run all braided line (which is legal) instead of hard line. The braided will insulate the fuel from heat much better than the hard line. I even tried insulating the hard line and finally went back to braided. No more vapor lock

Miles

PS Yes, over 12 inches of rubber (not braided) will not pass tech and you should never use rubber with 40+ psi.

 

I'm carbed so the PSI is not an issue...

 

12" limit - what if the fuel lines came that way from the factory and you run high twelves?

 

Yes, I agree with the last post. My car had more than 12" of rubber line from the factory. From the frame rail up to the alternator, I still have the stock rubber fuel line. Now, if braided steel is okay, what about hose along the line of Push-Loc, or Twist-Loc and the use of AN fittings?

 

there's a damn good chance your factory lines are actually rubberized braided steel. if not the rule book says 12" of rubber, for vibration connections mostly.

 

Oh, now I gotta spend even more money.

I'm running 42psi.

 

I'm sure the stock TPI rubber lines are more heavily reinforced lines as opposed to the low pressure rubber lines that are commonly bought at the parts stores.

 

The 4 feet runs of rubber I am using are high pressure transmission cooler lines. Someone said that they should work, I hope the gas doesn't rot them out and my lines burst or my injectors clog.

 

If the pressure is the main issue, the Earls, Aeroquip, or Russell push on type hose is rated at 250psi., and 250*. Oh well, the direction I'm heading right now, I don't think I will have to worry about tech inspection.

 

Your car can burn up in a fuel fire just as fast as a "fast car".
The 12" rubber rule is there for a reason. Steel hard line, some fittings and a bender aren't that expensive. If all that rubber hose
is on the pickup side of a fuel pump, it tends to get sucked shut
starving the motor for fuel about halfway down the track. The heat from the nearby exhaust weakens the rubber hose too.