SU woes

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Well, I've now eliminated the inlet manifold, having swapped it this afternoon. Float levels on the carbs were checked yesterday. I had a go at eliminating the fuel pump a while back though, to be fair, not terrribly effectively. I'm going to have another go at that next, though as the engine dies instantly when the throttle is lifted, I cant believe the float chambers run short of fuel in an instant..

However unlikely things may appear, I've go to the point now where I have to check them thoroughly.. The other thing I will do in the next round is check compressions, but again, on a brand new engine that shows no sign of problemmatic running (when it does run!) I think it unlikely I will find something there..

Further out in my thinking is to convert to single carb manifold and run the engine on each of the carbs in turn and see what happen then (with suitably changed needles, of course...)

thanks for the ongoing ideas..

Have you got to the bottom of this yet Hugh?