these have a mechanical pump on the n/s of the engine block and you would be there for ever trying to pump fuel out by these means and probably damage something in the process,you will have to drain the tank some other way,if you have started the motor you will need a new filter also,try and look onto the top of the tank there should be two pipes onto the tank unit,one white and one red,I think the flow is white so try removing that one first,press the two lugs in and remove pipe,attach a length of hose with a snug fit onto the pipe and syphon out the tank,sorry if I am wrong about the correct pipe,pre fill your filter with diesel and some fuel conditioner also before starting the motor,good luck
wickham
September 2010