Originally Posted by michaedo
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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An interesting anecdote.
The 1974 Vega had a weird setup that when you started the car the electric fuel pump would work but then it went through the oil pressure sending unit. If the engine lost oil pressure, the fuel pump would cut out leaving you stranded.
I made quite a few dollars replacing (or wiring past) oil pressure sending units in Vegas, whick also led me to find an Opel GT out in the middle of nowhere. (their Vega had the problem and the person just happened to have a GT that was broke down)