Around 1,500 litres of red diesel has been stolen from a farm in Fulstow, near Louth.
Police believe a large vehicle would have been needed for the theft which happened between 1am and 5am on Saturday, August 31.
Thieves may have used up to 60 small drums or used a vehicle equipped with large tanks to remove the fuel from the scene.
Police also believe a green Peugeot seen acting suspiciously around farm machinery at around 1.20am the same morning in Brackenborough may be linked.
Anyone with information should contact Lincolnshire Police on 101, quoting incident 130 of August 31.
Police believe a large vehicle would have been needed for the theft which happened between 1am and 5am on Saturday, August 31.
Thieves may have used up to 60 small drums or used a vehicle equipped with large tanks to remove the fuel from the scene.
Police also believe a green Peugeot seen acting suspiciously around farm machinery at around 1.20am the same morning in Brackenborough may be linked.
Anyone with information should contact Lincolnshire Police on 101, quoting incident 130 of August 31.