Background, kit car almost ready for IVA. Ford xflow with Accuspark coil, distributor, leads and new plugs, fitted with facet high flow 2.5-4 psi electronic fuel pump (black plastic model). It is fitted with twin dellortos and piper air filter. Using sierra wiring loom. The car has been running for months including on tick over and high revs on driveway to check cooling system and driven on private property to test brakes, steering etc.
However recently it has an intermittent fault which I cannot pin point due to engine stopping before any readings can be obtained. So engine starts fine, runs for 30 seconds to 1 minutes then stops, immediately switch ignition off then the car re-starts straight away with no delay.
Checked so far;
Fuel OK 15 litres in tank
Battery voltage low so on charge for a few days
Spark upto spark plugs OK used LED spark plug testers
Gunson colourtune - right colour not rich or weak
Fuel pump does not cut out and whilst I have not used a pressure gauge, pumps well into container and then thumb over pipe indicates good pressure, plus as said before it has been running very well.
Also check fuel chambers in carbs all OK
Tested coil and replace coil with known good coil.
Thought ignition relay but tested and even bypassed same fault occurs.
Could be dizzy electronic module fault - not sure how to test except it does produce a spark. I can return to accuspark for testing but thought I would check for other ideas.
No rush working away from home for a few days, next garage time will be the weekend.
Any advice appreciated thank you.