This is from NHTSA site. Problem is that it covers only some states, but we up north also have hot summers. Maybe the problem is common to all 1996 Volvos 850 but Volvo (Ford) is playing it down.
Make : VOLVO Model : 850 Year : 1996 NHTSA CAMPAIGN ID Number : 04V368000 Recall Date : JUL 23, 2004 Component: FUEL SYSTEM, GASOLINE:STORAGE Potential Number Of Units Affected : 105000 Summary: ON CERTAIN PASSENGER VEHICLES ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE STATES OF ALABAMA, ARKANSAS, ARIZONA, CALIFORNIA, FLORIDA, GEORGIA, HAWAII, LOUISIANA, MISSISSIPPI, NEVADA, NEW MEXICO, NORTH CAROLINA, OKLAHOMA, SOUTH CAROLINA, TENNESSEE, TEXAS, AND UTAH. AFTER PROLONGED EXPOSURE TO EXTREME HEAT, THE FUEL TANK MAY DEVELOP SEEPAGE AT THE HEAT SHIELD ATTACHMENT. Consequence: WHEN THIS OCCURS A FUEL ODOR MAY BE PRESENT AND FUEL SEEPAGE IS POSSIBLE. FUEL LEAKAGE, IN THE PRESENCE OF AN IGNITION SOURCE, COULD RESULT IN A FIRE. Remedy: VOLVO WILL INSPECT THE FUEL TANK FOR FUEL SEEPAGE AT THE HEAT SHIELD ATTACHMENT POINTS . THE FUEL TANK WILL BE REPLACED IF ANY SEEPAGE IS FOUND. THE MANUFACTURER HAS NOT YET PROVIDED AN OWNER NOTIFICATION SCHEDULE FOR THIS CAMPAIGN. OWNERS SHOULD CONTACT VOLVO AT 1-800-458-1552. Notes: VOLVO RECALL NO. R139. CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).