DLA Energy is requesting quotes for a firm-fixed-price purchase order for 7,500 US gallons of clear on-road ultra-low-sulfur diesel (DS2), restricted as a 100% small business set-aside under NAICS 324110 with a 1,500-employee size standard. Delivery is required by September 18, 2026, between 7:00 AM and 11:00 AM via tank truck with pump to Building 4631 at NASA Marshall Space Flight Center, AL 35812, discharging into above-ground tanks at Building 4611. Offerors must be registered in SAM/SBA under NAICS 324110, and award will be made on a lowest price technically acceptable/best-value basis considering price, technical capability, and past performance. The resulting order will be FOB destination, with inspection and acceptance at destination, electronic payment through WAWF, and a permissible quantity variation of plus or minus 10%. Contractors must comply with installation access-control procedures, and DLA Energy will not pay for delay costs at security checkpoints; quotes with accelerated payment terms or delay fees will not be considered.