What am I missing? 1990 B2, 2.9 EFI. 119,000 km, new in tank lo pressure fuel pump, Hi pressure pump removed flushed, working as it should, new fuel filter, all cylinders over 95lbs, cold, 40+ lbs on fuel rail, new spark plugs, injectors all operating as should TPS working as should, new fuel pressure regulator, fresh fuel. Swapped out fuel pump relay. Truck starts but will only run for 30+- seconds and then won't start at all. WTF am I missing

 

So…are you losing spark or fuel? Are there KOEO fault codes?

 

According to the ‘89 Ford Service Manual, your compression is too low


and the fuel pressure might be too high


depending on what 40+ means.