SOURCE: locating vacuum canister and testing it
The purge solenoid should be in the hard plastic vent lines that run under the tube between the intake and the air filter, ablove the transmission, it is common for vibration holes to be worn in the hard plastic tubes causing a vacuum leak. The purge solenoid is small and it has an electric wire coming from it. I 'think' your canister is in the front lower left corner under the hood, you may have to remove splash shields to see it. The problem is most likely in the hard plastic lines at the solenoid. Let me know if this helps.
SOURCE: engine code p0442
small EVAP leak
you'll need a smoke machine, scan tool and lots of time
real bear to find but start with the obvious under the vehicle lines that look like they may have suffered damage from rocks etc.
SOURCE: gas comes out when filling
When filling your tank, if the fill hose kicks off and/or gas kicks back up the tube it's an indication that the evaporative emissions vent tube is plugged, the cannister vent valve is not working correctly, or that there is a restriction in the fill pipe/hose. Unless the tank or pipe was recently worked on or part of an accident, you can eliminate it. I've found several concerns involing the vent tube and cannister vent valve. Spiders like to make webs inside of these items and the web blocks the air from escaping. When you fill your tank, the air inside needs to go somewhere. If it can't escape, it will cause the gas to back up and shut off the fill handle or kick gas back. There are ways to check this function with a scan tool and pressure machine but you can also do a visual inspection by disconnecting the valve and looking for webs or debris. You can also run water though the open line or blow shop air though to be sure it's clear. The P1450 is an evaporative emission code and is probably related to the filling concern but could also be a seperate issue. If the concern is not obvious, you will need to have an auto tech hook up a scan tool and perform a pressure test while monitoring the fuel tank pressure sensor. Basic diagnosis is 1.0 0 1.5 hours multiplied br the shops hourly rate. Ex: 1.5 hr. X $100.00 = $150.00 diag charge.
SOURCE: 2000 Ford Expedition My Expedition (4.6L
Continuous Memory Diagnostic Trouble Code (DTC) P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum. Also, a DTC P0446 indicates a vent control malfunction.
Possible causes:
EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.
EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.
Fuel vapor elbow on EVAP canister contaminated.
Restricted EVAP canister.
Canister vent (CV) solenoid stuck closed (partially or fully).
Plugged or contaminated CV solenoid filter.
EVAP canister purge valve stuck open.
Fuel filler cap stuck closed (no vacuum relief).
VREF circuit open in fuel tank pressure (FTP) sensor.
Damaged FTP sensor. (fuel tank pressure)
Check for kinks or bends in the fuel vapor hoses/tubes (EVAP canister purge outlet tube and EVAP canister tube).
Visually inspect EVAP canister inlet port, CV solenoid filter and canister vent hose assembly for contamination or debris.
Check CV solenoid filter for blockage or contamination.
The common things I've seen are are mud in the canister and the canister vent solenoid being shot or the wiring to the canister vent solenoid being torn off. The resistance of the solenoid should be 48-65 ohms..
Pick up a Chiltons book and will give you a diagram of where exactly you find the canister. They are like $15 at any auto store. Good luck
PLEASE RATE THIS REPLY FOR ACCURACY
182 views
Usually answered in minutes!
×