Need help running new fuel lines

[jmark06]

I'm getting ready to plumb up my turbo engine in my 77 280z and need a couple of questions answered. I've searched and figured most of it out, but want to make sure. I want to use 6 AN braided from the tank, to filter, to pump, to filter, to rail, to regulator, to return, to tank. I measured the tubes coming out of my tank the the top one is bigger than the bottom one. I figured the bottom would be the outlet (to the pump) but it's smaller, I think 5/16". The top is closer to 3/8" or 7/16". So which should I use as the outlet? Secondly, do the AN to tubing compression fittings from Earl's work well? And finally, what tools will I need to put everything together, I've not worked with AN fittings and hose very much? Thanks for your input.

[Pop N Wood]

The larger of the two tubes is the supply and the smaller the return.

 

I have a bunch of the Earls tubing compression fittings and they work great. Just expensive. I am using regular wrenches on mine. Just make sure you don't overtighten them. Also if you are using AN to hose, don't mix brands of hose and fittings. They seem to be specific to each other.

 

You didn't mention what type of engine or mods. If you went way up in HP over stock you may want to consider larger inlet and outlet tubes in the tank.

[jmark06]

Thanks Pop N Wood, I'm looking for about 300 hp when I finish using MS extra and supra 440cc injectors. I beleive the outlet on the tank is around 7/16" but I was going to come off of there straight to 6 AN hose then to a filter with 6 AN inlet and outlet. Will that be OK for my setup or do I need to go 8 AN before the pump?

[240zwannabe]

you want to tighten the actual nut just so that it just hit the sleeve then turn it back 1/6 turn...i dont know why thats just what i was taught at A&P school