DO NOT LET A DIESEL RUN OUT OF FUEL {no} I cranked the sub, backed down the drive (steep) and it pooped out. I knew instantly what it was considering I was heading to get fuel anyway. Had to winch it back up the drive to a relatively flat spot. Spent a good hour priming and cranking and had to use the Jeep to keep battery flow up. I almost had it cranked when the batteries started fading :fu( Dang, never again!!