Had a friend bring a 7. 3 to me yesterday. Turning over but not starting and blowing white smoke while trying to start. The engine fired twice after turning it over off and on for about 2 or 3 minutes. Then I noticed the water in fuel light was on. So I then noticed the gas cap was missing on the flatbed. I then pulled his fuel filter. The fuel was yellow like lemon lime gatorade yellow. It smelled like diesel but it was yellow and a bit murky. Is there something growing in the tank?? I have never seen this and would love some opinions on what is going on.