It fired up lovely and drove me from the point I abandoned it back to my house which was all of 500 yards! Hopefully I'll get to give it a proper test drive today. Bit scared tbh! 😱
So is it now running ok now?
It could just be that since you took out the screw the return was stirring up the tank and disturbing the loose stuff.
Or was it because of the screw you were getting more fuel than you needed?
J
Several break downs later and finally an intermittent fault became permanent. Which helped me to detect it. So no fuel supply. Whipped out the pump, took it apart and was totally blocked up with tank rust!
A red top will be fine. The carburettored RRC had them as OE fitment. I'd suggest putting a filter ahead of it so you can easily see if it's dirty. They have an internal filter (behind the hex cap) which cannot be easily monitored.
Wow! That is amazing. Thank you so much for your dogged detrrmination to get to get to this. I have just got home so haven't had time to read through the whole thread yet, but to see that photo brought a broad smile to my face after a hard day...
Yes that's what I'm thinking. The black pipe is just that ie pipe, but I'll take another look at the thread on the other side over the weekend. I've just ordered an amal main jet off ebay for a couple of quid and hopefully work around that.
So, for what its worth, I had the same probpem with my Stromberg carbs, extremely pronounced in the Tunesian desert (go figure). Was definietyl heat induced, as the carbs were basically boiling while you could touch the engine block without too...
First photo shows the fuel supply in and supply off to the left to 2nd carb.
2nd photo shows supply coming over from firs carb and the return to take pipe.
As above a pic of your setup may help.
As I said earlier there maybe a restriction, I also thought they were at the carb end.
SUs don't need/take much pressure.
Whatever you use make sure it cant get loose and end up somewhere it shouldn't ;)...
That's a good idea too.
I think the newly overhauled carbs are so efficient now that the fuel is by passing them and pumping straight back down the return and back to the tank. Path of least resistance sort of thing.
Can you take/post a photo of the rear of the carbs(pipe work)
As for a restriction,put a very course thread screw in the pipe,cut the head off(the finer the thread the more a restriction)
So the feeling of ecstasy was short lived. But it makes sense. The removal of the screw blocking the fuel return now leaves insufficient pressure. Although it ticks over fine and no longer overflows, a test drive showed that it doesn't pull under...
I'm thinking a tank removal happened at some point and it was a plug. But would have been fairly hard to miss when it went back together. That said it was screwed in a long way.
Well thank you so much everyone. There was a bloody great screw inserted into the fuel return pipe when I removed the pipe from the petrol tank! Removed it and put the pipe back on. I ran for 20 mins and no overflow!!! 'm ecstatic!!