750sx issues

To start of I have a 750sx with a factory pipe on it. I hooked up the lines as shown in the picture. I took it out to test it and it kept dying on me so I thought it may be the idle so I turned that up and still nothing so I swim the jetski in. Then when I go to start it on the trailer it won't start but makes a spurting sounds for the spilt second it engages. Anyone have any idea what this could be?

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