when i open JEI in my inventory i and type @Immersiverailroading i only see one train and a few items and i cant find anywhere of what to do

IR never had biodiesel. That came with Immersive Engineering. As far as JEI, all the IR stock is actually the same item with different NBT data, so it's been compressed in JEI into one to avoid menu clutter. If you're in survival, consider checking out this guide: https://github.com/TeamOpenIndustry/ImmersiveRailroading/wiki/Getting-Started

i dont have biodiesel and thats making me mad like where did it go? i have 16.5 version. and its not showing anywhere!