O.K., over the weekend did some experimentation. Tried to start 91 w/o jumper wire,no go. Took the fuel pump relay off of my junked 87 740 turbo and swapped it out- 91 240 supposedly takes same relay. It fired right up but when I switched off ignition, the pumps kept running,? Took relay out of my 89 240,installed in 91-fired right up and when I turned off everything shut down as it should. Tried 740 relay in 89-worked fine and as it should,? Put the original relay back in 91 -fired up,turned off,tried again-nothing. So, long story short,it's probably the relay, sometimes works,sometimes not.
One question though, I popped cap off all the relays and inspected them carefully-the 740's relay and the one out of the89 240 are identical inside, but the 91's relay is different inside with a couple of the connection prongs extending up to the coils and points area. Is this some variation of this relay that I need to worry about when ordering a new one? I get my stuff from FCP Groton and their parts #'s indicate the same relay for all 3 models.