Stuart thank you,
I'll try an inline filter ...Since I recommissioned my beta it's had power drop out problems at certain times. The fuel pump was noisy, so I presumed it was being overworked
( with crud in the tank ) ..both this and the 'missing' disappeared beit briefly when I changed the external fuel filter,
but its back ...at less regular intervals but it's disconcerting, particularly at roundabouts in busy traffic and so on to suddenly lose power. I've bought another filter but it will be much easier to 'see' what's going on with a transparent one. ( and easier to change potentially ) ..I might use both.
It's worth noting that I've also looked at the 'front-end' replacing the battery with a new one and making sure I have good connections etc.
When it's running smooth there's nothing better ..hopefully I'm not that far off.

( Apologies members for straying off the original topic )
Andrew.