I have decided to put a rectangular fuel tank under the boot, with a stainless perforated sheild. I have some 5/16 NB hydraulic steel line here, can I use that as suppy and return lines? Too big or too small?

I used 5/16" for my vent line & 3/8" for the fuel & return
but that was to suit the 2L Subie. You might be OK with 5/16"

You need to match the size of the fuel tubing on the engine, or bigger.

Mike

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Too many cars, and too little time.

found a site that said that 5/16 line was good for 350 hp..

After reading information on micra engines, they say that you can increase the power alot (15 kw) by adding 4-2-1 extractors and cold air intake. Then you need to do something with a line... kink it or something so that the engine does not run lean. Can i just increase the fuel pressure in the line by getting an adjustable fuel reg?
Ebay has oem vl turbo pumps for 90 bucks and adjustable regs for 132 bucks. Does that sound ok?
I dunno decisions decisions.

Are you going Gti or Micra motor? They will all benefit from a FPR.

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But he's thriving and striving and hugging the turns.

yeah dunno..
want to do somethning different...

Cut a hole in the floor and drive around Fred Flintstone style..... I would consider that departure from normality equally challenging yet moderately amusing at the same time.

Baa I say, Baa (As in be a sheep. Seperate yourself from the pack and the wolves will pick you off)

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But he's thriving and striving and hugging the turns.

I ran two lines of 5/16 for the fuel and return lines should be more than enough for a 1.3 pretty much no matter what you do to it. here's a pic or two...

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225hp atw on 14psi. 1/4 Mile no idea. Take one 1971 Mini Clubman, one Starlet GT Halfcut, Simmer over a warm MIG Welder, and Voila Minstar! www.mpdesign.id.au

thanks for taking the time to help.
Today I am going to get pics and measurements of a micra motor