Land Rover Repair: Fuel Cap - Tank Pressure, emission control system, cap tank

Question
Hello John;
I am 3rd. owner of a 1997 Disco with 128K.  I've noticed recently when fueling up that there is no release of pressure when I remove the gas cap.  Also, I am throwing 2 mil's: PO 183 and PO 184.  Are these issues related?  Should I expect to replace the Fuel Pump?  Car is starting and running fine at the moment.  Your thoughts and comments would be appreciated.
Brian  

Answer
There is no way to really answer your question without connecting your truck to the specialist LR test system and checking the evaporative emission control system.  The lack of pressure recently does not necessarily indicate a specific problem

The P0183/4 faults are for the fuel temperature sensors.  These faults may be the reason the tank does ot have the usual pressure.