Cleaning dirty fuel tanks

That's where the #### goes. I don't know if it's worth the effort to take the tank off and wash it. You still have to dry it afterwards.
In this case, at least you know your treatment worked.

I've seen an increased level of fuel in the Davco filter after I used Lucas lubricator. Had to change filter only once between services. I stopped using it in fall. Now during this winter, I've noticed in general a lower level in the filter compared to the years before.

I would just give it two weeks before I rip it apart.

 

Yes I would try to run it out if the filter cost is not to high. Other things can also cause dark fuel but just one tank?
Have pressured washed them out on the truck. Make an angle tip for the nozzle and wash it in every direction you can. Use hot water and soap, then rinse. Leave the cap off and the drain plug out. Use a torpedo fairly close to dry out the water.

 

Most all fuel tanks have a drain on them. If you can find a nice long warm weekend. I’d suggest Getting 20-30 gallon of clean diesel (to get back to the fuel station) run your fuel as low as you can. Let the truck sit as long as you can. Then drain off the sediments, if possible rinse with diesel or a solvent. Fill it with your clean deisel and see if that helps.

 

I had the same problem a few yrs back. Just keep changing filters. It eventually cleans up. No problems since.

 

It may not be algae, but asphaltene, which requires different treatment. When you change the filter, is it slimy or gritty? Slimy is Algae, gritty is asphaltene.

Fleetguard Asphaltene Conditioner, Quart CC2597

 

Have you considered the diesel quality where you fuel at? Maybe flash it with a flashlight. It could just be dirty fuel. The other possibility is using a diesel test strip (if they sell them) to verify the purity?