2004 CADILLAC XLR Fuelpropulsion System Problems

I PURCHASED A 2004 XLR IN 2019 FROM AN AGENT IN FL. I IMMEDIATELY OR WITH-IN 200 MILES I BEGAN TO RECEIVE MESSAGES ON MY DASH! FIRST IT WAS TRACTION CONTROL THAT APPLIED THE BRAKES AND CAUSED THE CAR TO VET VIOLENTLY TO THE LEFT AS SOON AS I HIT 65 MILES AN HOUR. THEN THE CHECK GAS CAP FOLLOWED BY CHECK ENGINE LIGHTS CAME ON. MY CADILLAC DEALER WAS AT A LOSS TO SOLVE THE PROBLEM WITH TRACTION CONTROL UNTIL THEY CONTACTED THE CORVETTE ENGINEERS IN BOWLING GREEN, WHICH TOOK A WEEK! THEY REPLACED THE GAS CAP AND THAT PROBLEM WENT AWAY ONLY TEMPORALLY! ON FURTHER INSPECTION THE TECH'S AT MY LOCAL CADDY DEALER DETERMINED BY A SMOKE TEST THAT THE CROSSOVER HOSE BETWEEN THE TANKS WAS LEAKING! THEY GAVE ME AN ESTIMATE OF CLOSE TO A $8000.00 REPAIR! THE CAR HAS LESS THAN 54,000 MI. I HAVE RESEARCHED...

CHECK GAS CAP, CHECK ENGINE LIGHT. DEALER SAYS I NEED A NEW RT FUEL TANK BUT NONE ARE AVAILABLE. WHAT DO I DO NOW?

FUEL SENDING UNIT KEEPS FAILING CAN'T TELL HOW MUCH FUEL IS IN TANK. HAD FIRST ONE REPLACED AT COST OF AROUND $2300.00 REPLACEMENT LASTED AROUND 18 MONTHS THEN IT FAILED . NEVER KNOW WHEN WHOLE UNIT WILL SHUT DOWN AND LEAVE ME VULNERABLE TO A REAR END OR STALL. *TR