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Hi Chris, my name is Jason.
The electric fuel pump is a big no no, it is not safe nor legal to use one, the engine was never designed to have one either.
That being said, have you checked engine compression and spark output yet?
When was the last time the engine ran?
How old is the fuel?
Will the engine run at a faster rpm if you rev it up?
What are the actual compression numbers? Numbers are important, once it gets to low it won't run.
Will the engine run at a higher rpm if you rev it up?
Locate the fuel primer, it will have a red lever on the side of it. Is that lever pointing in towards the primer, or pointing away from the body of the primer?
Turn the lever away from the body of the primer, let me know if the engine runs any longer or better.
Hello Chris, my name is***** will assist you from here.
When you are doing the cold start, even with an electric fuel pump, you still need to be using the enrichener to prime the engine with fuel. Hold the key pressed in as you are cranking the engine over. If you are also using premixed fuel and oil, it ill take a bit longer to fire, as it is rich for a cold start. When it does fire up and runs for just a brief moment, press in and release the key switch a few times to see if it will stay running.
Make sure that the mixture screws on the carbs are set correctly. They should be 5 turns out from a light seat, and may need slight tweaking from there.
Verify that the mechanical timing of the engine is correct. When the Number 1 piston is at TDC, the 0* timing mark on the timer wheel should point at the arrow.
Let me know what you get.