aston56

Try unhooking the 50 PSI switch cannon plug. If you get enrichment with a hot engine, worse thing you'll have to do is stop start. At least you'll know if it's excessive fuel pressure at the enrichment kill switch or a bad signal from said switch. Had one once that the first start of the day would give you an enrichment start with good de-enrichment without enrichment selected. Every start after that was fine. Did all the steps you did with the enrichment valve/harness's, grey box etc.., finally R2'd the fuel control and never came back. Not exactly the same problem you're having though.