I have a 2007 fxdwg with a thunder max Ecm. Everything has been great until last week. Now I have no fire at the spark plugs and the fuel pump has stopped working.

 

Does anything electrical work, such as your lights, horn etc? If so, consider these as two separate problems and chase each one down. I suggest you start with the fuel pump. If you remove the filler cap and turn the ignition on, can you hear the pump make any sound? If not check the elctrical wiring to it. That will probably require some dismantling and use of a multimeter. If you don't have one a factory service manaul is a good idea, your local dealer can supply one.

 

Check all fuses. If good, Install the OE ecm and try to start it. Seen many a TMax go south.