ret1614 wrote:
Hey, think this is my first post in a year or so, but here goes. Reviving this thread...
The voltage regulator controls the fuel pump. It makes sure that the fuel pump doesn't keep pumping gas all over you if you're unconscious and on fire. Usually helps after an accident or something like that. If the GEN light comes on, your alternator isn't putting out enough juice to keep the fuel pump relay closed. When the key is in the 'start' position, it overrides this function, allowing the engine to get gas and start right away. Figured this out when my voltage regulator quit on me a few years back.
So, if your truck won't run for more than 30 seconds, and your GEN light is on, concentrate on the charging system rather than buying a new carburetor, rebuilding your old one a few times, replacing your fuel filter a few times and otherwise going broke on replacing parts that aren't broken.
Kinda late for the situation in this thread, but maybe it'll help someone with the same problem in the future.
All the above correct. One more tip I have mentioned a few times: If the gen light comes on and the engine/fuel pump stops---just unplug the voltage regulator connector and drive on home. This then powers the fuel pump through the gen light circuit and gets you home, running on your battery of course.