The check engine light in my Toyota Tundra keeps coming on. Can't find the...

double B

New member
...problem. Any help? I have a 2003 Toyota Tundra V8 4WD Access Cab. The check engine light repeatedly comes on. The code reads something to the tune of "Fuel System leak detected." I have read through several online forums and have read similar stories such as changing the gas cap, changing the fuel filler tube, Oxygen sensor replacement, etc. I tried changing the gas cap (the simplest, cheapest solution first), cleared the code, and it re-triggered 2 days later. If any one has any insight, I would appreciate it. Thanks.
Also, I have noticed that when my gas tank is between half and full, the light never comes on! Weird, huh?
What is a diagnosis machine? Thanks.
 
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