diagnostic trouble codes

[20004x4]

I have a 2000 Ranger 4x4 4.0 auto. 4:10 The fuel mileage has never been great 14- 15 actual. The ck. eng. light came on and the code is po455 evap control system, big leak detected. The truck runs as it always has with the exception of the fuel mileage has dropped to less than 12. I've checked for vacuum lines and replaced the fuel cap. I was told the rubber seal around the filler tube and fuel tank was bad and the tank would need to be removed to do this. Has anyone else had this problem?
Thanks in advance.

 

[Earl43P]

Evaporative Emissions

PINPOINT TEST B: DTC P0455 MAJOR LEAK OR NO FLOW DETECTED OR DTC P1443 VERY SMALL OR NO PURGE FLOW DETECTED IN SYSTEM


B2 VISUALLY CHECK FOR GROSS EVAP SYSTEM LEAKS


1 Check for the presence of a fuel filler cap. Do not tighten or check for correct installation at this time.

2 Check the input port vacuum and EVAP return tube are connected to the EVAP canister purge valve.

3 Check that the canister vent solenoid is correctly attached to the EVAP canister.

4 Check for disconnected or cracked fuel vapor hoses or tubes between the intake manifold and following components:

l EVAP canister purge valve

l EVAP canister

l fuel vapor vent valve assembly

5 Check for damaged fuel tank or fuel filler pipe.

l Is a concern with a hose, tube, connection or valve visually evident?

è Yes

REPAIR or INSTALL new EVAP components as necessary. Go to «B3».

è No

Go to «B3».



Your filler neck should have two clamps, one for the large fuel hose that routes fuel to the tank and the one for the vaccum should elbow off the neck to a clamped small vaccum hose. Inspect the entire length of that hose.

 

[Earl43P]

Evaporative Emissions

PINPOINT TEST B: DTC P0455 MAJOR LEAK OR NO FLOW DETECTED OR DTC P1443 VERY SMALL OR NO PURGE FLOW DETECTED IN SYSTEM


B3 CHECK FOR EVAP SYSTEM LEAKS


1 Disconnect the EVAP return tube from the intake manifold and plug the EVAP return tube.

2 Connect the Evaporative Emissions System Leak Tester to the EVAP test port.

3 Carry out the evaporative emissions system leak test. Refer to «Evaporative Emission System Leak Test» in this section.

l Does the system pressure stay above 1.99 kPa (8 inches H2O)?

è Yes

Go to «B4».

è No

VERIFY that the fuel filler cap is installed correctly. REPAIR or INSTALL new components as necessary. CARRY OUT the evaporative emission system leak test. REFER to «Evaporative Emission System Leak Test» in this section. If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. REFER to «Evaporative Emission Repair Verification Drive Cycle» in this section.

 

[Earl43P]

Worldwide Diagnostic System (WDS)
418-F224,
New Generation STAR (NGS) Tester
418-F052, or equivalent scan tool

CAUTION:
The evaporative emission system must not be pressurized to more than 3.48 kPa (14 inches H2O) or damage to the evaporative emission system may occur.

1. Connect the Evaporative Emission System Leak Tester to the evaporative emission test port.

2. Close the canister vent solenoid. For additional information, refer to «Canister Vent Solenoid Closing Procedure» in this section.

3. Pressurize the evaporative emission system to 3.48 kPa (14 inches H2O).

4. Monitor the system for two minutes. The system fails the leak test if the pressure falls below 2.0 kPa (8 inches H2O).

5. Repair any leaks as necessary.

6. Repeat the leak test until the system remains above 2.0 kPa (8 inches H2O) after the two-minute test period.

 

[Earl43P]

Worldwide Diagnostic System (WDS)
418-F224,
New Generation STAR (NGS) Tester
418-F052, or equivalent scan tool

CAUTION:
The canister vent solenoid must not be energized for more than nine minutes at one time. Once the canister vent solenoid is energized and de-energized, adequate time must be allowed for the component to cool adequately. Failure to allow the component to cool may create a false failure in the diagnostics, causing unnecessary repairs.

1. Connect the scan tool and select the output test mode.

2. Select the fuel tank pressure (FTP) and the volts (V) parameter identification (PID) for monitoring.

3. Select the ALL OFF mode.

4. Close the canister vent solenoid by pushing the START button on the scan tool.








So, what I get is inspect all the lines and vaccum tubing, maybe you have a bad cannister vent solenoid, if you can't find any leak points....

 

[20004x4]

Thank you all for the quick replys. I will ck. all these items and let you know what I find.

 

[Backwoods Mudder21]

Whats Up

Hey wondering what you found out im having the same problem i did my PCV valve n was planning on the purge valve next. Just wondering what you came up with thanks

 

[powerranger262]

There is a small elbow that is known for cracks on these engines. It is towards the front of the engine on the passenger side. Right under the radiator hose if i remember correctly. I'll go snap a pic for you.

Here ya go. There is a small rubber tube with another bigger plastic tube under it. On the larger of the two tubes is the elbow with the arrow on it. Check right at the bend for any small holes/cracks. I had to get mine from the dealer, which came with the whole plastic tube and all.