Gents, I know I'm late to this thread, but with everyone stuck away, I guess
boat time is standing still.
I have a 4 JH-TE, which I think is one generation earlier, and turbo charged (hence the lack of the "2" and addition of the "T"). I just today was attempting to start after a long
layup (well over a year in tropical climate). Initially, no start. So I flushed fresh
fuel through both filters to the
injector pump, then started to bleed injectors. Front three started weeping
fuel pretty quick, so I tightened them down, and while cranking to bleed the back injector, she started up and ran away. Luckily I had been briefed by a cousin
mechanic who warned me to standby with a board over the intake. The board didn't shut it down, but forced it to idle for several minutes, so I unscrewed the
fuel filter to create a bubble to stop it. No effect was observed with the
power (throttle) cable or the stop lever. The fact that I had both a dry injector and a runaway made me think how they could be related. And after
research, I think a stuck plunger in the
pump could cause the fuel rack to be stuck at wide open
power setting.
If you think about it, the stop lever slides the fuel rail (and rotates the plungers) to the no-fuel position. HOWEVER, after stop, most all of us return the stop lever to the run position. With the governor set to idle, and no revolutions, the fuel rack should then be sitting in the wide open position for the entire
layup. If a plunger gets a tiny bit of
corrosion due to moisture, the precision fitting may seize up, and prevent the governor from sliding the fuel rack back when three of the four cylinders run wide open.
After considering this, I have found a simple test I will perform tomorrow.... disconnect all pressure fuel lines from the
injector pump and turn her over. If all four
ports spit out slugs of fuel, the plungers are pumping, and problem is likely the governor. if one or more are dry, the plunger(s) is(are) stuck and likely so is the fuel rack. Remember, the throttle cable is directly connected to the governor, not the fuel rack. the fuel rack is controlled by the spinning weights of the governor. if the rack is stuck, the spinning weights aren't enough to move it.
I think my board didn't cut off all airflow, thus the idle. Next time, I think cracking a few injectors will stop her quicker than an air bubble in the fuel line.