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Worked on a Toyota that was doing the same thing. Ended up
being the run relay. Don't know why but there's a relay that
powers the fuel pump on start up and switches over to another
relay once the engine starts. Looking at an Opel diagram it does,
indeed, have a dual relay setup. Looks like there's a fuse involved
just before it. All this is on a page in a book, I'll be darned if I'd
know where to find them on the car. My bet is your (more than
30 year old) relay has bit the dust. Just guessin'.
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