Henry Lanford

I am brand new to the group. Thank you. 1986 XJ6 van den plas Quite suddenly developed this problem. It starts promptly and runs for a couple seconds and stops. If I retry right away it might start for what I think is a briefer time but often will not start again at all - until much later. I thought the problem could be the AVM not turning the fuel pump on with airflow, but that was wrong: if I move the plate in the AVM - with ignition on - the fuel pump does run. At the moment I am stumped.