P1149 ssangyong fuel filter drain short-circu

Maybe this links will help

http://obdii.pro/en/code/P1149
http://p1149.enginefaultcode.com/

Siphon pump

Check if there is a drain plug on the lowest part of the tank, if not can you pass a hose down the filler tube, if not remove the fuel gauge sender unit and use a hose to drain from there.

P 0031 A short or open in the heater circuit in the sensor
A failed O2 sensor heater

P 0051 same as above
P 1149 Air/Fuel ratio circuit 1

Your issue is not a do it yourself job, you need to take the car to a shop/ dealer

Drain fuel filter should have a drain hoze Under fuel filter

waar kyk ek wat die voet kan wees op code p1677

Did you test the fuel pump relay and fuel pump pressure?

easily! first pull out filter to let oil get drained than (may take a time)
discharge oil, change filter case lid seal, draining plug copper ring, close it, load fresh oil, last litre of fresh oil into filter case, as quick as possible close it tight with nuts, start motor, watch for leaking.

have your catalytic converter checked it mite be plugged