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Fuel pressure regulator
The stock Bosch Opel fuel pressure regulator for the L-Jetronic is non-adjustable. It is typically set for bypass at 45 PSI. The pressure as Bill Hoffmann indicated will vary for the Opel Bosch EFI from 31-44 PSI depending upon engine RPM and load conditions.
The fuel line should be 5/16 or 8mm multi-port fuel injection hose or solid line that will withstand that pressure. Copper tubing will work.
Just as an aside, that Bosch EFI pump can run the fuel pressure at the fuel rail up to about 100 PSI. Don't ask me how I know. You don't want it at the pressure by the way. Really bad things can happen. Once installed, it is a wonderful idea to check the pressure on the system at the fuel rail.
Good luck with that project.
Dave
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