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Hello, my name is ***** ***** am I speaking with?
GSI is a family of engines, there should be at least one more letter after the I degisnating the fuel model number. Can you double check your model number for me.
Which ignition system is on the engine?
What you will need to do is check and see if the engine has spark output or if there is also no spark. The easiest way to do this is to hook up a timing light and crank the engine over and see if the light flashes or not. Can you do this and let me know?
Nevermind, I just read that it runs when you pour fuel into it, so there will be spark. The engine needs to get hooked up to a scan tool in order to see if the ECM is operating properly.
I don't think this is something I'm going to be able to help you with as the engine needs to get hooked up to a scan tool, and there are no shortcuts without a scan tool.
You are very welcome. Good luck.