The seal on the gas cap can stop sealing as well, causing occasional issues. Got get a new cap and you should be good. They are cheap, and easy to install 
Replacing mine took care of the issue for me.
Matt
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My Collection:
2000 M5 - Custom Avus Blue/Black; Black/Blue/Brushed Aluminum interior; Dinan mufflers; Dinan Stage 2 S/W; Dinan Flywheel; AGA/Dinan Rear Diff Reinforcement; Blackened OEM Wheels
1987 Vette - Dark Red Metallic; Tan interior; 383 Stroker motor, LPE cam, LPE headers, ported heads; Electric Power Steering and Water pumps; Gutted; Race suspension
1989 BMW K100RS - Special ABS Edition Blue/White; Luggage; Fox shock; Remus pipe
1999 BMW R1100S - Mandarine Orange; Low bars; Luggage; Ohlins Suspension; Remus Race pipes; FIM chip
Wifes car - Dark Silver 2006 Civic EX w/Nav
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