According to Tinternet J reg is either 1970 or 1990 which would tend to mean it has 2 pumps.
Random stops and eventual no start tends to be pump failure, pump relay or cps. If its related to tank level then maybe more likely in-tank pump issues, but harder to tell in 2 pump systems.
See my post in B230FK cutting out thread for a list of tests to do to eliminate various items.
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