Spoonter fuel line

[Rex_Kelway]

Mornin all,

Rex has run a new 5/16 fuel line under the G-AE86. He is however not 110% happy with it.

Just out of interest, where/how have other nobs routed their new fuel feed line?

Currently the fuel line of Rex is 5/16 copper bundy-toob and it follows the same kind of path as the originals but does not cross to the passenger side past the gearbox. He was toying with the idea of re-running it hard up against the inside corner of the drivers side chassis rail.

This way its quite straight and can screw some decent clips directly into the rail every 200-300mm.

BUT, under the rear footwells this will put the fuel line only 20mm from the lowest point of the car. He is trying to reconcile the fact that even after 20 years or so these rails are still untouched/un-scraped/un-dented so it shouldn't matter

So does anyone have any ideas or proven setups/pics. Rex can be a proper tightarse perfectionist.

Cheers,

Rex

[ToranaJudd]

On topic but off question here.

I thought that a standard line would be 3/8? 5/16 sounds a little small?

Just what i thought was the norm, and peolpe upgrade to 7/16 for high HP applications?


Cheers, Judd.

[takai]

Standard line in a spoonter is 1/4", and the stock return is pissy.

[roadsailing]

the return straw is 4mm.

I'd like to up the size of my fuel lines, not so much to support more power but to give my (new) fuel pump an easier life after the one i'm using dies completely.

[45aken]

i've got 3/8 in and run the 6mm feed line as return. will probably have to upgrade it to like 5/16 though, and in that case i'll just run the return straight near the feed (along the drivers side of the tunnel.

[Hen]

I think what you are suggesting Rex is a very good idea. I assume the Oz-spec fuel lines head over the tailshaft and back over the gearbox due to the 4AC exhaust routing. Running straight along the chassis rail sounds like a good, simple fix.

Or if you want to keep it further from the ground maybe along the top/side of the transmission tunnel. Just be careful about clearance around the gearbox.

Hen

[takai]

The gearbox clearances seem to be pretty ok down that side of the car, and the chassis rail does make sense, nice and straight all the way down. Maybe shield it if its an issue.

[Hen]

The gearbox clearances seem to be pretty ok down that side of the car.

Hopefully. I am just wary after things sat very close with a W58 and stock fuel lines. I bit of torque twist and the box would have crushed the lines. However if you use your brain while laying a new line this shouldn't be a problem.

Hen

[takai]

True, teh W box does change thigns up a little, i was thinking of mine with the T50

[EVOSTi]

a little OT, but just wondering has anyone ever actually found the limits of the stock fuel lines? i have noted over the years that alot of people change their fuel lines when going gte or even gze, but has anyone left the lines standard and actually had a problem that was caused by the size of the standard lines? noone has said it in this thread, but i have read others comment that the standard lines cannot accomodate a 4agte, when this is simply not the case. not knocking anyone who has uped the size of the lines, there are probably people who NEED the bigger lines, but has anyone gone for big HP and found the lines restrictive afterwards?

[45aken]

well i guess there must be some max hp figure that a 6mm feed and 4mm return can handle. cost me about $40 to change to bigger lines, so at least i'll never have to worry about it again.

also i think the chance of something punchuring the lines is pretty slim, as it is quite thick walled and flexible tubing.

[EVOSTi]

i know its cheap insurance, im just curious if someone has found the limit. and isnt the carbon canister line 6mm also? from memory i just used that as the one of the feed/return lines.

[spoon]

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quote 45aken

"i've got 3/8 in and run the 6mm feed line as return. will probably have to upgrade it to like 5/16 though, and in that case i'll just run the return straight near the feed (along the drivers side of the tunnel."

-think you'll find that 3/8 is bigger than 5/16... ie 3/8=6/16

[45aken]

upgrade the return line..

[takai]

Im using 1/4" in and out of the engine bay, simply using the carbon line as the return to my surge tank.