The problem with my car was air leakage between carburettor and manifold/support due to rough surfaces. I straighten up the surfaces and replaced gaskets, now my car can run for hours

It was the coil.

Metalguru3 said:

I would guess electrical or fuel.

Change condenser, points as well if youve got any.
fuel pressure next - check output from pump is healthy
check carb isnt blocked with crud (you will need to strip it to a degree to find out)
I've had a 600D I used to do production car trialling in - sadly no photos. They are rare in the UK, but look what I found in a barn in Menorcal last year - there were 3 of them

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Haha no way I’ve just come across this post. I now own that exact green Seat 600 and brought it over to Manchester, England. My friend now owns the white one which is still in Menorca and now on the road. He drives or around when he goes over.

I have a very similar issue with the car, I drove it 3 miles to the fuel station and then on the way home starting running rough and backfiring then just wouldn’t move under its own steam and eventually died. 5 mins later it started and ran fine again for a few mins. Hopefully it’s just a carb clean that is needed.

Hi guys

It often is also possible that the fuel pump pin driven from the camshaft has worn down over time and so the fuel pump doesnt get enough lateral movement of the pin, there is an adjustment that can be done by changing gasket thicknesses to get more pump movement and hence more fuel. its worth reading up in the manuals.

Tim