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Q: can evap system leak cause bad gas milage in 2002 f-150 on 2002 Ford F-150

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can evap system leak cause bad gas milage in 2002 f-150
(1) Answer
Yes, it could. i.e. a disconnected vacuum hose or a stuck open vent solenoid will let extra -unmeasured- air into the manifold and since the ECM will adjust to the perfect air/fuel ratio it will keep the injectors open for a longer time, which results to lower gas mileage..
I don't know if this is the problem in your case, but it can happen for sure.

Zee
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