‘Dark cloudy fuel or a jellylike substance indicates diesel bug, so it’s time to look at an additive’
Technical Consultant WITHIN A WEEK or two I will be trying to remove from my fuel tank all traces of water that has got in and made the environment more conducive to diesel bug growth.
I use a Pella oil extractor to ‘vacuum’ the bottom of my tank with special attention to the lowest corners, until I see clear bright fuel being sucked out. You can also use a siphon or even a wet & dry vacuum cleaner suitably modified to accept a small pipe.
If your tank has a drain plug, check the boat’s trim because, in many cases, the water will be below the drain at the back of the tank.
Bright clear pink fuel is fine; cloudy pink indicates possible water contamination; dark cloudy fuel or any jelly-like substance indicates diesel bug so it is time to look at a bug killer additive. I added a fuel conditioner at my last fill in the autumn which should help precipitate any water and also kill any bug.