Rock,

Start by throwing a jigger full of gas in the intake and then try to start it. If it spits and sputters even a little bit, then you know you have spark and can investigate the fuel system. If it won't even spit, then start investigating things that might interrupt the ignition system when in the water. This allows you to take the correct troubleshooting fork in the road.

Hope this helps.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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