Gas cap is extremely difficult to secure.

I just found a campaign for the same problem You will have to take to dealer for repair. No: SB14O Ref: Issue: 1 Date: 12/19/03 SERVICE ACTION Fuel Cap/Filler Neck Sealing AFFECTED VEHICLE RANGE: NOTE: A limited number of vehicles in Retailer inventory are affected by this Action. Editor's note: This campaign applies to specific VIN's. Contact your local dealer for additional coverage information. Discovery Series II (LT) 3A767790 to 4A830188 Build Date 26 February 2002 to 13 August 2003 SITUATION: POOR SEAL BETWEEN FILLER NECK AND FILLER CAP NOTE: The symptoms outlined for poor filler cap fit condition may also be indicative of a trickle valve failure. Discovery vehicles in Retailer inventory before the safe VIN may have a fuel filler neck thread manufactured out of specification. This can cause the fuel filler cap to bind and prevent the cap from sealing adequately prior to the start of the fuel filler cap ratchet process. A fuel vapor leak from the filler cap area can cause the MIL lamp to illuminate and fault codes P0446 and P0455 may be logged. RESOLUTION: TEST AND IF INDICATED REPLACE FUEL CAP AND/OR FILLER NECK NOTE: This Service Action is for un-sold vehicles held in Retailer inventory only. Prior to customer delivery test the seal integrity of the fuel filler cap on all vehicles in Retailer inventory before the above VIN. Where indicated, replace either the fuel cap or both the cap and filler neck. This Service Action covers both 2003 and 2004 model year inventory. PARTS INFORMATION: WLD500100 Fuel filler capQty 1 WMJ500140 Fuel filler neck Qty 1 LRN0002LABEL Campaign Label Qty 1