The 'E' Type Forum

I’ve noticed my SU carbs don’t have the correct overflow pipes that feed fuel to below. The rear carb has one that appears ok, the middle seems to have a crimp in it that would prevent fuel flowing through and the front has been cut off and crimped about an inch from the float lid. And I only have (overflow) holes in the top of the rear and centre float lids, not the front. One thing that may explain the difference is that the rear has a AUD112R tag, the centre a AUD112F, and the front has no tag. Maybe a twin carb set up converted to 3?
So I’m assuming I need to buy the correct overflow pipes but should I also be changing the front float lid for one with a hole


Centre:

Front:

Rear:

The hole is blind so it matters not. You can make new tubes out of brake pipe - solder them on to the banjo connector.

Barrie

Well, IMHO the front lid cannot provide overflow if there is no path for the excess fuel to flow. Not sure what is meant by "no hole".

Use 3/16" cunifer brake pipe soldered into the banjo but don't use too much solder else you may block the pipe. Make sure you can blow through it. I found out the hard way what happens if the overflow is blocked. What happens is fuel flows out of the carb air intake!

Thanks I’ll make up the overflow pipes using brake pipes

Originality questions for a '70 S2 with SU carbs:
- What were the original overflow lines made of (copper, maybe cad plated)?
- Is there a definitive original pattern to the tube bends (pictures available somewhere)?
- And is there a definitive original routing of the tubes (pictures available somewhere)?
I imagine there were no material differences among the 3.8s and 4.2s on the above.
Thx

The three copper SU overflow pipes are gathered together in a line of three and supported by the bracket on the filter housing:



The Service Manual shows the routing:

Thanks, David.

You may find this description useful. Credit goes to the original poster. His name is on the screenshot.