The Cal-look Lounge

Need a big outlet and a return bung welding onto my stock tank. Anyone in the UK (or event better local to London) recommended?

You can weld it --- just weld the bung where you want it THEN drill the hole into the tank --- no sweat - no mess

I'm not sure I understand. I thought the bungs sat inside the hole so some was inside the tank? I can also only MIG weld and I don't think I'd be able to get my torch in there to do a safe enough job.

Just weld the bung to the exterior of the tank where you want it --- has to be a steel bung of course -- -- then when you have it all migged up nice and neat take a drill that is the same size of the inside of the bung orifice and drill into the tank --- This will eliminate all the explosive problems. 

OH diffently make sure your power is turned down on your welder (remember you are welding sheet metal) so you don't burn through into the tank

OK I'll give it a go, thanks. Now that I've bought a decent welder it's amazing how much control I have on the thinner metal. Still might need to trim a gas shroud down to really get in there and do a neat job though.

Why does the return and the outlet need to be big? AN6 should do for just about anything you can throw at it. I know some of the US stuff needs AN10 and AN12 to work according to the manuals but dam... its not like you`re trying to drain a swimming pool.

Just make sure you get all the fuel out of the tank before you weld it. It is a good opportunity to clean it really well and I use citrus acid in combination with water. Seal the tank, add 10 - 15 bags of citrus acid and 2-3 litres of water and shake the tank really well. If needed, add a meter of a rust free, clean chain in the tank and shake it again. Leave it with the acid over night and empty it the next day. Make sure you rinse carefully before you use a heater gun to dry it.

Good luck.

Best rgs
BB

I've got a very big pump. I'm running a single pump system feeding both the carbs and the nitrous. It flows way more than I need and if I ever want to step up to alky it would support that too. I really should run a smaller pump but I've got this one :)

Marco Mansi does a screw on union that fits to a stock tank that takes up to 4x 3/8 Npt unions; that's more than enough to fuel the space shuttle  ;)
http://www.marcomansiperformance.com/products.html

Interesting, cheers. What's the effect of having the return in the same flow as the outlet?

That's what I was wondering

Buy a tank that has been lying around for a few years, thats what i did!

Welded up 3 bungs, 1 flow, 1 return and one breather on the neck.

The one I have has been fluid free for 5 years.

CB performance have been doing it for Years on their FI and turbo kits. The only slight issue i can see would be a small warming up of the fuel as it pressurises and then recirculates.

I think the factory did it on type 4s too, my worry is that the fuel coming back (which in my application is going to be a lot) will somehow 'block' the flow going out. I'd not really thought about the hot fuel getting picked straight up by the inlet again. hmmm

8 going 6 coming back both on 1/2 inch tubing --- no worries - no headaches - no having to redo it later when you decide to step up

one and done

As Fiatdude says; it won't be an issue at all ;)
Get yourself a fitting from Marco ;) they are top notch!

Advice taken, thank you.

NO in does not!