You probably have a failed fuel brain.
All 1989-1991 Bosch LH 2.4 systems, 240 and 700 series
(non-turbo, non-bendix ignition sytems) had a high fuel brain
failure rate. The ground circuit inside the fuel brain that grounds the
fuel pump relay would fail. Only fix is to replace the fuel brain.
The origional  fuel brain ended in "561", last 3 Bosch numbers on
outside of fuel brain. The replacement brain ends in "951",
last 3 Bosch numbers.
Try this also.
There should be 2 black relays attatched to the side of the
coolant bottle. Swap these 2 relays and see if the car starts.
The relay with the red/green wire feeds 12 V to the injectors.
This relay can and does fail.
The other relat operates the front electrical cooing fan in front
of the AC condenser. These 2 relays are the same p/n.

BD
---------------------------

You should have  a fuse listing on the back of your ashtray. Try fuses 1, 2, 11,
12 and 13. Also try the fuel pump relay, middle row left hand relay on relay
tray behind fuse tray.

Cheers, Peter.

Thank you Big Dick and thank you Peter for your help!

It turned out to be the fuel brain.
At least the car started after me having knocked on it a couple of times.
Then changed it. By the way it's pretty difficult to find one's way to the
relay tray as there is a harmless-looking screw that turns out to be the
ONE... next time i'll be quicker!

Thanks again,I really appreciate it,
Daniel