Misfire and cold start trouble

[The Mighty Gryphon]

if fuel came out the vacuum hose, then the regulator is leaking
you could keep riding with the hose plugged until replaced, i guess its only job is to reduce fuel on low rpm deceleration
somewhere i read that some people disconnect it permanently

I would advise against blocking the hose.  If the leakage has nowhere to go then the chamber behind the regulator diaphragm will fluid lock and raise the fuel pressure at the injector rail to the maximum the pump can output.  If you must remove the vacuum line it would be best to route it down to discharge below the transmission like the tank overflow does. 

[BearTrap]

I removed the regulator and it is confirmed that it is leaking fuel through the vacuum line. Gonna replace it with a PR134 and be done with it. Once I adjust the exhaust valve on number 2 cylinder I should be back on the road again.  :2thumbup:
Thanks again

[daveson]

yep i spose its just the throttle body vacuum stub that needs blocking
i wonder if the regulator has a spring inside to reduce the pressure, im guessing so

[rbm]

Yes, there is a spring.  Illustration from the Bosch L-Jetronic Injection manual: