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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! 😱

That is genius! :)

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!

You are a legend. I feel a pint coming on!

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! Is that a (already mentioned) mig welder tip fitted...

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.

Thanks. I did take it off at that point to see if there was anything in there but no.

That should say return to tank pipe.

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.

Excellent idea. I have plenty of them in the shed too. Photos to follow when I get home from work tonight. Cheers for sticking with me!

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.

Doesn't seem to be.

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 load now. Huffing, puffing, farting, hissing...

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.

Hilarious. Such a weight off though I can't tell you. I'm going to the pub!

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!!

Thinking the return to tank pipe could be blocked as suggested further up the thread. Will investigate. Floats and all associated parts are spot on.

Hmmm…..not sure about that. As there would be no point having factory fitted overflow ports and drain pipes from the carbs.

Photos of pump to follow when I next get a chance ti have a tinker.

Floats not flats!