This research presents a groundbreaking 3-in-1 hybrid tractor system that integrates military-grade durability, hydrogen sustainability, and ethanol compatibility to address fossil fuel dependency and promote sustainable agriculture. By retrofitting high-pressure Common Rail Direct Injection (CRDI) systems (2,500 bar) from military vehicles like TATRA trucks, the engine achieves unmatched robustness for rural conditions, while cyclone air filters and forged steel components ensure reliability in extreme environments. The system supports three fuel modes: diesel for heavy loads, ethanol blends (E20-E85) via corrosion-resistant port injection, and hydrogen through dual-fuel combustion (hydrogen-diesel) or spark ignition. Farmers can produce hydrogen on-site using biogas reformers, converting 1 ton of crop waste into 40 kg of hydrogen (sufficient for 200 tractor-hours), enabled by solar-powered compression and storage (350 bar).A triple-mode ECU dynamically optimizes fuel use, reducing diesel consumption by 40% and cutting CO₂ emissions by 50% in dual-fuel mode. Ethanol compatibility is ensured through flex-fuel sensors and cold-start systems, while challenges like hydrogen embrittlement and ethanol corrosion are mitigated via polymer-coated stainless steel and anodized aluminum components. Economically, farmers save ₹90,000 annually in fuel costs and gain ₹30,000/month from hydrogen sales. Aligned with India’s E20 ethanol target and National Hydrogen Mission, the system offers a scalable, policy-compliant solution validated through pilot testing in Punjab and Maharashtra. This innovation bridges military engineering, renewable energy, and rural empowerment, positioning itself as a transformative tool for sustainable farming and energy independence.