Just about to start re-asembling my new fuel pump on my 6GT3. I wonder if anyone knows how to check that the jet pump (venturi) pickup is working correctly. I tried blowing down the corrugated tube and it seems blocked, but I suppose if there is a venturi the aperture would be very small and so would appear to be restricted. I don't want to reassemble the whole thing and then discover it is not working correctly.

I searched online and there does not appear to be any diagrams to show what is inside the bottom plastic piece.

Any help/advice would be appreciated.

Venturi/JetPump GT3