Dyed diesel and clear ULSD are not the same order
Clear ULSD is the highway diesel. Dyed diesel is the off-road product for eligible equipment. Ordering the wrong one is a tax problem, not a discount.

Which engine gets which fuel
Trucks that run the public road take clear ULSD. Eligible off-road equipment, under the rules that apply to that use, is where dyed diesel belongs. Bulk Fueling will not tell you that your machine qualifies. The directory only shows distributors who sell the product you selected.
A site with both needs two tanks and a note that says which is which. A diesel wagon does not invent a second compartment because the email asked nicely. If the profile lists only one of the fuels, filter for the other or say so and expect a separate answer.
How the search uses the choice
Pick ULSD or dyed diesel before you rank. Listings that do not sell that fuel drop out, even if they are next door. That is why a familiar diesel company can vanish when you switch products.
Heavy-haul searches are a separate filter. A paving crew burning dyed diesel in iron is not the same request as a permitted load that needs clear ULSD in the tractor at 2 a.m. Use the filter that matches the job.
What to write when the site has both
Choose the fuel you need most in the form. Put the second product and its gallons in the notes, and only if that distributor sells it. Two clean quotes beat one muddled email when the products go to different tanks.
Search the job ZIP. A farm, a pit, and a highway yard in the same county can be different coverage problems for the same distributor.
Questions
Does Bulk Fueling decide if dyed diesel is legal for my equipment?
No. Eligibility is your compliance question. The site matches distributors who deliver the product.
Why is a close ULSD company missing from a dyed search?
The fuel filter keeps companies that sell the product you picked. Switch the fuel if you need clear diesel.