"vent" hoses on SU carbs?

Will Reeve · Post by **Will Reeve** » Wed Jul 07, 2010 5:18 pm

There seems to be a couple of port on my SU's which are just attached to hose which goes no-where! I have two ports which connect to each rocker cover (via a flame trap) and next to these are two ports that just had hose attached. What do they do, vent or overflow for something? Do I need to route hose down or can they just be left open?

kiwicar · Post by **kiwicar** » Wed Jul 07, 2010 6:28 pm

Hi
one of them is an overflow for the float bowl that wants routing out to somewhere it won't dump petrol on anything hot. One will be for vac take-off for a brake survo, possibly one for vac advance this will be a small bore pipe about 1/8". what is there is really dependent on what the carb came off.
Best regards
Mike

Will Reeve · Post by **Will Reeve** » Wed Jul 07, 2010 7:24 pm

Thanks Mike, that will explain why the pipe just went down the side of the engine! Left off fuel would just squirt onto the exhaust! I think I will make a new one (it was plastic and broke on removal!)