have fuel at the rail 40psi once started with fluid will restart after being driven, but after a few days sitting, won't start.

I have a 1993 960 wagon. Same problem need start fluid then runs great, got fuel at the rail, replaced the crank sensor, Mass Air Filter is good, relays good, once started it will restart after being driven, but will not start the next day or a few days later.

there is fuel at the rail but no spark

Thanks, the pressure tester fitting leaked so I have to test to see if pressure holds. I doubt it. I have a check valve but do not know where the old one is so I can't change it.

960 runs great! only starts on starter fluid then will start unless sits overnight. No fuel pressure until cranked and then fuel pressure slowly rises to 40 but no start.