Yeah I do have to same setup, cater black and 044 but in a coupe.

I'm just paranoid about properly sealing the un-needed pipe, as it has not thread on it...I wonder if there it a fitting you can get that blocks off a pipe end, as that could work.

(Here's a pic of the surge tank by the way)

if you are talking a efi CA install, i would advise running one pump (a normal carby fuel pump) from the main tank and into the surge tank, and then the second pump (efi one) from the surge tank through your fuel rail and then have your regulator (set at around 60psi depending upon your injectors) and back into your surge tank. It does 3 things it keeps your surge tank topped, it de-aerates your fuel and the third is it keeps your fuel cool. De-aerating the fule is very important as if you have air then it will lean out your engine and the ECU cant mix the fuel properly. (swirl pot).
Thats the way I had my race car and zero fuelling probs.
Oh by the way i had the swirl pot in the engine bay. for some reason John taylor used to always run them this way he reckons it eliminates alot of surge problems he was having. It couldnt explain why it was the case but after 30years of building race cars I took it on faith.

Nothing like conflicting information

So running the fuel line return to the surge tank keeps the fuel cool?

sikyne was just saying the opposite, run the fuel rail return straight to the fuel tank for cooler fuel...

I can go either way - but would like to know which is the preffered way?

By default I'm planning to run fuel rail back to the surge tank/swirl pot - then the overflow from the surge tank back to the fuel tank.

I figured if the surge tank came with 4 outlets that was the idea (to run fuel rail return into surge tank)

There is always more than one way to skin a cat.
Having the pot and pump in the engine bay would make the pumps job slightly easier, shortening the distance from pump to reg. but would be suprised to see the fuel be cooler with the pot in the engine bay.

The way im doing mine is build the swirl pot into the tank this keeps the fuel at the most constant temp and gets the weight as low as possable.
I will have the return going to the tank (im open for further debate on this but im going with what i have read and makes sense to me).

The tank will be insulated along with the fuel lines and rail. I have a mate that logs his fuel temp in the tank and it gains about 10 degrees c during a 10 lap race, thats why im putting in the extra effort of insulating.

All that aside, the system will work fine with the fuel return going to the swirl pot or to the tank. Those carter pre pumps flow plenty..

Ive never seen a surge tank setup that does not have the fuel return from the fuel rail.
The whole idea of a surge tank is to make sure you always have fuel available to the engine in all circumstances, be it hard cornering or excelleration.
It is vital that the pot remains full at all times which is why you lift from the main tank to the surge, and overflow from the surge to the main tank.
Supply the rail from the bottom of the surge and return almost at the top , then overflow to the main tank.

Heres a drwaing i did ages ago , only remember the overflow is the highest point on the surge tank...and that returns to main tank, I have drawn all 3 at the same height.

Cool I get it now.

sikyne - I look forward to going to an in tank setup in the future (so i wont need an external surge tank) - when i do that I will also return the fuel straight to the petrol tank.

With no experience welding I thought the easiest first option would be an external surge tank.

My diagram doesn't look quite as nice...but here is what I'm going to do.

cool, i think i will still go to the fuel tank but now i know the goods and bads of each. but the main thing is my way will still work.
would most ppl suggest having a fuel regulator is a good idea?
i have one but wasnt sure if i was going to use it

Also can anyone tell me which line is which

i think mine will basically be like this diagram i just drew

The top one is the inlet to the fuel rail, the bottom one (that points down) is the fuel rail return line (that your plumbing into your fuel tank).

Your diagram looks pretty good to - by the way.

Also I just bent up my fuel rail (just finished) will post a pic later tonight!