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Hey Engine Man - Does My Diesel Fuel Need a Fungicide?

Successful Farming Engine Man Ray Bohacz has engine grease and field dirt under his fingernails from a life spent repairing vehicles and running a farm. When he's not busy in the shop, he's working on maintenance articles and videos for Successful Farming magazine and answering questions from readers. The following is a letter Bohacz received from John Spors:

Hey, Ray . . .

Does FPPF Total Power (fuel additive) take care of fungus caused by using the 5% biodiesel fuel in storage? My fuel supplier tells me I do not need to add any additives, except maybe a fungus treament in the tank. 

Response from the Engine Man:

Thanks so much for reading my article and contacting me. FPPF Total Power works very well with B-5. The product helps to remove moisture and thus limits and keeps at bay fungi. But the additive is not a fungicide. That company does offer an excellent fungicide product that can be used once a year or so in your fuel storage tank. From what I know about your fuel supplier (Cenex), it produces an excellent premium diesel fuel. I was asked almost the same question by a Successful Farming magazine reader about a year ago. But when I did a little research on their fuel, I discovered that while they provide an excellent product, it could be made better with the addition of an additive such as Total Power when delivered to your farm. 

Do you have a maintenance question? Email Ray Bohacz at


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