Philvo,
I had the exact same thing happen to me this summer. See my link here:
https://www.brickboard.com/RWD/volvo/1634325/220/240/260/280/gremlins_fuel_system.html
You have to swap in a known good fuel pump relay first and if that does not work, swap in a known good ECU.
I had both lying around the house and it wound up being the ECU. The original one was the dreaded pink label.
After this episode I went on eBay and purchase another functioning ECU and am currently looking another as I have two bricks and I need to keep them running.
Best of luck.
Matt
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