The stock fuel hard lines start to run up the transmission tunnel, but then do a sharp turn towards the driver's side. Do you think it would cause any issues if the lines were cut at the bend, and then straight hard lines were spliced in with flare unions and ran the rest of the way up the middle of the transmission tunnel?

I would run the hard lines up as far as the firewall, and then from there use -AN fittings with short braided hoses to connect the fuel rails. The objective is to have as clean and stealthy a fuel line install as possible.

Is this doable?

 

Why not just run braided SS from the point where you want to cut off the stock hard lines?

 

It would have to make an "s" curve with bend radii that are too tight to conform teflon hose to and still be able to tuck tightly enough to clear the rear of the intake china wall. The hard lines that terminate at the firewall will have a steeply angled upward bend at the end so that the -AN fittings will be pointing up instead of forward.

I'm just trying to determine if the reason GM didn't originally run the lines in this fashion in the first place was because it would pose some kind've danger or fire hazard or if the lines being run way out of the way like they were was for a different reason. Intuition says that going straight up the middle won't be a problem but it's been wrong plenty of times before.

 

I've got a -6AN supply and a -6AN return all the way from the tank to the back of the firewall and the fuel rails, and I can assure you it fits and is installed within the specifications for the lines. I'm not sure what the "intake china wall is".... so you might want to educate me on that.

One risk of running lines in the tranny tunnel is the risk of trans, clutch, flywheel or flexplate explosion. NHRA requires that metallic lines or woven/pushlock (but not braided lines) be protected at the bellhousing in a 16" length solid steel pipe with a 1/8" minimum wall thickness. Once you replace an OEM line, it must be metallic, braided or an approved woven/pushlock type, and you are allowed no more than 12" of non-metallic or non-braided line to make the transition to the engine. NHRA also requires that fuel lines not be mounted in the driveshaft tunnel.

 

Pics,and Part #'s please... Also how did you connect this to the fuel rails...

Thanks in Advance,
Joel

 

Everything is pretty much custom built..... two Bosch fuel pumps, an SX billet filter, a Weldon AFPR, some -10AN and -6AN braided line and a couple of NOS -6AN "Y" fittings. There are -6AN fittings welded to the back ends of each fuel rail for inlets, and a -6AN fitting welded to the front cross-over line for the return. Throw in a 3/8" NPT bung for a fuel pressure gauge on the driver's side rail.

One in-tank pump, one pump pulling off a -10AN connection at the bottom/rear of the stock tank. Two pump -6AN discharges combine through a -6AN "Y", into the SX filter mounted in the stock location, -6an line down the tunnel (marginal legality) up under the firewall, to another "Y" splitting the supply into a -6AN line into the back of each rail. Return comes of the front cross-over pipe, -6AN line to the AFPR under the cowl, -6AN line back to the tank.

Rear of rails:

http://www.injuneer.com/images/photo.../DCP04227a.jpg

Pressure sensor and return line connection:

http://www.injuneer.com/images/photo.../DCP04272a.jpg

http://www.injuneer.com/images/photo.../DCP04269a.jpg

AFPR under the cowl:

http://www.injuneer.com/images/photos/DCP04234a.jpg

Plumbing at rear axle and in tunnel:

http://www.injuneer.com/images/photo.../DCP03551a.jpg

http://www.injuneer.com/images/photo.../DCP04302a.jpg

I can't find my photo of the ocnnection to the tank sump....

 

Whoa

Is there any way I can run a braided line where the lines come apart under the car?

 

Yes. There are "compression" style fitting to convert the 3/8" supply and 5/16" return lines from hard tubing to -6AN braided SS. You would need to use the conversion fitting under the car and at the hardlines attached to the fuel rails.

 

You my friend are the MAN!!!!

I would need something like this to convert?
http://www.jegs.com/webapp/wcs/store...56885_-1_10301

But I do not see anything for the 5/16" line. I will continue my search

 

Check the major names, like Russell. They make -AN adapters in 3/8 and 5/16" for GM EFI connectors...

http://russellperformance.com/mc/adapt_fit/fuel.shtml

Also try the online catalogs at The Chassis Shop.

http://www.chassisshop.com/

 

These are the fittings I'm using:

http://i46.photobucket.com/albums/f1...befittings.jpg

Part #'s are on the box.