Well,

I decided on repainting my engine bay this winter and the underbody of the car and also at some point upgrading my intank pump, so ive got to disconnect all of my fuel lines. I want to look at replacing all of them from the plastic lines and connectors under the driver side door back to the tank... they dont leak but therer rusty and i figure that while there out I might as well replace them. I was thinking about upgrading to braided stainless stell lines for all of them but does anybody forsee any problems in doing this, i dont know what pressures there for soo...
What size line and fittings would I need to do this??? and has anybody else gone this route?


thanks,
-john

 

Braided SS lines are fine for the fuel system. You would use -6AN for both supply and return (assuming you aren't going over maybe 800HP). Use the stock routing, but come directly up into the engine compartment from under the car, at the back of the engine, rather than going through the fender well where the stock lines run. I used the Aeroquip AQP series hose.... good to 1,000psi.

 

Injuneer,
Thanks for the info. Does aeroquip have a websight and what kind of prices and how may feet did you end up needing total?



thanks,
-john

 

You can find the Aeroquip info in the Summit catalog. I would expect they also have a website. I have a complete -6AN supply and return system, and used maybe 30 ft of line. I do have dual pumps, one in the tank and one outboard, running in parallel, so I used extra line for that. I also feed the back of each fuel rail independantly, and take the return line of the diagonal cross-over pipe in the front of the rails, so that's extra line as well.

 

sorta on topic but let me take this on a tangent.
Is it not true that NHRA-IHRA-FIA safety rules require that fuel lines be kept away from the rear of the engine, (the flexplate-flywheel area) ? (unless shrouded is some sort of super thick steel).

Karl Ellwein

 

NHRA requires a shield on the flexplate - under 10.00 (or bellhousing on a manual tranny - under 11.50), and on the trans casing of an auto tranny - under 11.00. Fuel distribution blocks and isolators must be located at least 6" in front of the flywheel/fbellhousing. Fuel lines other than braided steel must be shielded by a 16" length of rigid steel tubing. Fuel lines may not be routed in the driveshaft tunnel.

My car meets all those requirements.

 

I mention this just for the point that fuel lines in the area of flexplate-flywheel and near the front of the engine with blower belts should be in a steel tube or re-routed out of harms way. Even if it's not a "rule" it is probably a good idea to look at things like this.

Just going by my IHRA book, (I don't have an NHRA-FIA rule book)
General Safety:
Fuel Lines: All lines must be IHRA accepted. Fuel lines in the flywheel bellhousing area must be enclosed in a 16" length of steel tubing. 1/8" minimum wall thickness, securely mounted as a protection against fuel lines being severed....

For IHRA they don't have the "except for steel braded" exception and I coulda sworn last time I read FIA rules they didn't have that exception either.

Karl