We clean fuel tanks
everyday and our findings vary from tank to tank.
What we find in vehicles/vessel with either gas or diesel that have saddle type tanks (one port/one stb'd or one driverside/one passenger side) is one tank has much higher chance of a greater contamination issue. This is usually due to the orientation during the idle periods, while in a slip, parking lot, etc. One side will see a greater difference in temperature changes therefore we find more contaminates there.
When we clean a diesel fuel tank
, we can tell if the owner has been using a biocide. Our findings is a small coffee ground size granular - dead bugs. Once these little devils get to your racor
, the filter will plug
and you are shutdown.
The bugs are microbial growth that exist due to water/condensation in the tank. What most biocides do is kill the bugs but however very few minimize or eliminate the water
, therefore the bugs come back. I repeat this store everyday "if you have moles in your yard, all of the traps and poison will not stop the moles. You have to eliminate their food
source, the grub worms and beatles in the soil." The water is the food
source for microbial growth (A.K.A. bugs, algae, etc).
So does diesel go sour over winter? Each tank is different, mostly depends how it has been cared for. Usually healthy diesel will endure a season of being layed up. And as always, treat the fuels when they are fresh. No fuel additive can make wine out of sour grapes.