why does my f150 have a large evap leak after running for 15 minutes on 2009 Ford F-150

the problem occurs mostly on rainy damp days the dealer said it was code 0442

by in Houston, AR on October 26, 2012
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
ANSWER by , October 27, 2012
P0442 is a small leak in your evaporative system, something like a loose or worn gas cap can trigger this code. Loose or damaged vapor hoses, defective fuel tank pressure sensor, issues at the EVAP canister as well as any issues at evap solenoids. If you have a capless filler pipe, the seal may be poor. To diagnose this problem the proper "smoke" machine would come in very handy.