At times, actually most of the time, I am amazed that these engines run at all when you consider the electronics and all that is being monitored as it runs. Here's my story. Engine would start but died at idle unless I kept the bulb pumped. Pulled the mechanical fuel pump and found a broken gasket but also noted that the last rebuild did not have the gaskets and diaphrams in correct order, and there were no ck valves, only the translucent plastic retainer disks. The rebuild fixed that problem but now if I run it up to 4k+ RPM within a few minutes the engine abruptly shuts down and with no warning lights. Just dies with no warning. It will restart immediately with one key turn and back up and running perfectly. At 3K will run all day. So this sure sounds like an RPM limit circuit is kicking in, but why after a fuel pump rebuild? Absolutely nothing else was touched, adjusted, or whacked with the three pound hammer. The ECM's (computers in this beast) monitor everything except my blood pressure so my best guess is with a faulty fuel pump possibly adding additional fuel into the system it was running too rich and the computers adjusted for that and now it.....? Just a guess. Any thoughts out there? Thanks for any input!
