Holley help needed

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Guys I need some advice on the most likely cause of a problem I am having with my car. It has a small block Chevy fitted with a Holley 600 with vacuum secondaries (model 4160) and fed by a Holley electric fuel pump (97 gph).

It has run pretty much faultlessly for 13000 km. On my way to the meet at Elvington, UK (and spookily enough just as the odometer rolled past 13000 km – though I am not superstitious…) for a few seconds the engine hesitated then lost all power. I was travelling slowly (about 50 mph on a light throttle load) – I was just about to reach for the hazard warning light and coast to a halt when the engine picked up again and started operating normally. I ran faultlessly all the way through Elvington, including runs round the track and on the drag strip.

Next occurrence was 2 weeks ago (at 15500 km) when on another club event in Germany, the same thing happened during a cruise, again on light throttle opening. Engine lost all power for a few seconds (maybe 4 or 5 seconds), then it returned to normal operation. It behaved all the way home (more than 500 kms).

I believe engine electrics are 100 pct OK and it almost feels like the engine has lost all fuel supply. So possible causes?

- Fuel pump intermittent problem – I have about 20000 km on the pump over 9 years and wouldn’t have thought this would be a problem yet.
- Blocked fuel filter? Unlikley - why is the loss so total and then it recovers and runs faultlessly again?
- Problem with the float in the Holley? I am coming to the conclusion that I have a sticking float in the primaries in the Holley. Have any of you guys come across this problem and do you agree with my diagnosis?

Appreciate any insights.

Thanks