ChrisD
New Member
Am chasing a double problem with 1456 code and a fuel vapour leak. Have looked at several posts on this forum, which were useful but will need some more advice in order to get this fixed.
Vehicle is 1998 Accord LX with 2.3 VTEC.
The car leaks raw gasoline fumes but only after the car has been running. The smell comes from underneath the vehicle, about where the rear seat is. The fumes dissipate after 20-30 minutes which suggests that the buildup of pressure in the tank is what is leaking out. Once the pressure leaks out, the fumes stop.
Along with this, the 1456 code activates but it is intermittent. Once I delete the code, it could be 2 months before it lights up again. It's not constant.
In trying to remedy the 1456, these parts have been replaced:
gas cap, canister, bypass solenoid and two-way valve.
Have done a visual inspection on the tank and hoses, nothing obvious although not everything can be seen well.
Thinking this through, it seems like it can be one of two things.
One - there is a physcial break / hole in tank or hoses allowing the pressure to escape even though the EVAP system is functioning (no 1456 or 1457 most of the time).
Two - the pressure is not getting evacuated by the system. Since the 1456 is not always activated, it would seem that the pressure sensor is functioning. Since there is no 1457 code, it seems that the purge solenoid is also working. Also, if there is too much pressure in the tank, the gas cap is supposed to release it. The fumes are escaping from under the car, not the gas cap.
The other ingredient is the dreaded ORVR valve on top of the tank. Not sure how it works and if it has any influence on the flow of pressure from into the EVAP system. Found a post on this forum on how to get at it but don't want to tackle this if not necessary.
Grateful for any insights on this one.
Vehicle is 1998 Accord LX with 2.3 VTEC.
The car leaks raw gasoline fumes but only after the car has been running. The smell comes from underneath the vehicle, about where the rear seat is. The fumes dissipate after 20-30 minutes which suggests that the buildup of pressure in the tank is what is leaking out. Once the pressure leaks out, the fumes stop.
Along with this, the 1456 code activates but it is intermittent. Once I delete the code, it could be 2 months before it lights up again. It's not constant.
In trying to remedy the 1456, these parts have been replaced:
gas cap, canister, bypass solenoid and two-way valve.
Have done a visual inspection on the tank and hoses, nothing obvious although not everything can be seen well.
Thinking this through, it seems like it can be one of two things.
One - there is a physcial break / hole in tank or hoses allowing the pressure to escape even though the EVAP system is functioning (no 1456 or 1457 most of the time).
Two - the pressure is not getting evacuated by the system. Since the 1456 is not always activated, it would seem that the pressure sensor is functioning. Since there is no 1457 code, it seems that the purge solenoid is also working. Also, if there is too much pressure in the tank, the gas cap is supposed to release it. The fumes are escaping from under the car, not the gas cap.
The other ingredient is the dreaded ORVR valve on top of the tank. Not sure how it works and if it has any influence on the flow of pressure from into the EVAP system. Found a post on this forum on how to get at it but don't want to tackle this if not necessary.
Grateful for any insights on this one.