Have a code 1440 (evap control system, small leak, positive pressure) could this be a reason why my car is wasting more gas than it should?


Asked by Feb 12, 2013 at 06:40 PM about the 2000 Infiniti G20 4 Dr STD Sedan

Question type: Maintenance & Repair

4 Answers

Possible causes- Incorrect fuel tank vacuum relief valve - Incorrect fuel filler cap used - Fuel filler cap remains open or fails to close - Foreign matter caught in fuel filler cap - Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve - Foreign matter caught in EVAP canister vent control valve - EVAP canister or fuel tank leaks - EVAP purge line (pipe and rubber tube) leaks - EVAP purge line rubber tube bent - Blocked or bent rubber tube to EVAP control system pressure sensor - Loose or disconnected rubber tube - EVAP canister vent control valve and the circuit - O-ring of EVAP canister vent control valve is missing or damaged - EVAP canister is saturated with water - EVAP control system pressure sensor - Absolute pressure sensor Read more: http://nissanhelp.com/diy/obd_codes/p1440_infiniti.html#ixzz2KjT9HZPe

2 out of 2 people think this is helpful.
Best Answer

bwah, go down the list or give it your college try-


I don't know the advertised gas wasting figure but it will lower you're MPG's. Any time the systems are not operating as designed, it decreases efficiency. All is not lost, the "fix" may be as easy as tightening or replacing the gas cap.

probably as our fellow GURU tenspeed says 'THE GASCAP' either isn't seating well, the gasket is comprimized or the seat is blocked, somehow.

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