Find helpful customer reviews and review ratings for DuroStar DS4400EHF Hybrid Portable Dual Fuel Propane/Gas Camping RV Generator at Amazon.com. Engine Manuals. View Manuals by Model Number. Generator Manuals. View Manuals by Model Number DuroMax Power Equipment DuroStar logo. Buy Durostar DS4400EHF Generator Parts now. Need advice? Engineers are always happy to help. Manual and Repair Guide - Workshop version link for your model number to open a .pdf version of the generator manual. DuroStar DS4000S Generator Diagram, DuroStar DS4400EHF Generator Diagram.DuroStar DUAL FUEL FORTRESS DS4400EHF Manual Online: Generator Setup. Proper setup of your generator will get you going as soon as possible while making DS4400EHF OWNER'S MANUAL This manual provides information regarding the operation and maintenance of these this manual and on the generator.