Fuel Cap

[BPeschka]

This is not a Class C or even an RV specific question but I figure someone here has experienced my problem. 2004 BT Cruiser 5210. Ford E350 Super Duty V10.

I lost my gas cap somewhere. Bought a new one at Autozone that they say is correct for me. I get the dash light and a warning to check fuel cap. Ordered another from Amazon, a Motorcraft, that says fits my unit. Put it on and ran the engine for a while, still have warning lights.

My question is, should I expect the warning light to go off as soon as I install the correct cap (or within a few minutes) or does it take longer to adjust/react.

On a much older Volvo sedan I had, it would start bucking, as if running out of gas, when the cap wasn't tight. Reacted immediately when I tightened the cap.

Thanks