Posted by jaluhn on January 22, 2013 at 19:52:22 from (166.137.209.26):
In Reply to: 3500 Fuel Issue posted by jaluhn on December 31, 2012 at 18:22:33:
And the verdict is......
The fuel screw was turned all the way down! So it was working right the whole time..... (well aside from needing delivery valves lapped) :roll:
My guess is that somehow in the process of troubleshooting whatever problem led to the head being pulled someone tried turning up the fuel but didn't realize that screwing it in decreased the fuel flow.
So after much head scratching and cussing it turned out be a very simple fix. Typical, huh? On the other hand, I learned quite a lot about Simms in line fuel pumps and how to work on them. I was able to spill time the pump on the bench and I tried to put together a calibration bench to set the fuel flow but it didn't work right. Couldn't get the counter to work and one of the injectors didn't want to seal but it did work to see the governor and injectors working.
I also learned that these pumps have an excess fuel device built in that gives you max fuel delivery for cold starting. You push in the shaft in the center of the shutoff lever with the throttle held at max and should get a click, then it'll pop back out once the engine starts and comes up to governed rpm or if the shuttoff lever is tripped.
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