Question about 1999 Ford Escort

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Ford fiesta It appears that fuel is leaking from the fuel tank when it is under pressure is there a vent that could be blocked

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  • amberlyn Jun 11, 2008

    ford fiesta petrol car

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    diesel leaking out when driving

  • Anonymous Mar 17, 2014

    Ford fiesta fuel vent problem

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Landrover discovery idles rough when hot but idles good when fuel tank is low


Hi have you made sure the fuel tank is vented? or if the vent is blocked as i know of a couple of these that have done a similar thing, the fuel cap vent got blocked and the tank was under a lot of pressure causing problems in the idle, worth a try anyway

Apr 08, 2012 | 1996 Land Rover Discovery

1 Answer

On my 2001 rodeo the check engine lite came on and the only code that came up is po440, can you tell me what this is


This alarm concerns the function of the EVAP SYSTEM. This system monitors vacuum correctness. If a sufficient vacuum level cannot be achieved, a large leak or a faulty EVAP canister purge solenoid is indicated. It can be caused for the following reasons:
1) Disconnected or faulty fuel tank pressure sensor
2) Missing or faulty fuel cap
3) Disconnected, damaged, pinched, or blocked EVAP purge line.
4) Disconnected or damaged EVAP vent hose.
5) Disconnected, damaged, pinched, or blocked fuel tank vapor line.
6) Disconnected or faulty EVAP canister purge solenoid.
7) Disconnected or faulty EVAP canister vent solenoid.
8) Damaged EVAP canister.
9) Leaking fuel sender O-ring.
10) Leaking fuel tank or fuel filler neck.

Apr 13, 2011 | 2001 Isuzu Rodeo

1 Answer

I recently purchased this 1999 Chevy Blazer and it wont pass inspection because the OBD2 Diagnostic trouble code states it's problem is, code P0440-Evaporative Emission System. The guy said it looks like...


The evaporative leak detection diagnostic strategy is based on applying a vacuum to the EVAP system and monitoring the vacuum decay rate. The VCM monitors the vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid turn ON, allowing the engine vacuum to draw a small vacuum on the entire evaporative emission system. If a sufficient vacuum level cannot be achieved, a large leak or an EVAP system malfunction is indicated.

The following conditions can cause this problem:
* A disconnected or malfunctioning fuel tank pressure sensor
* A missing, malfunctioning, improperly installed, or loose fuel cap
* A disconnected, damaged, pinched, or blocked EVAP purge line
* A disconnected or damaged EVAP vent hose
* A disconnected, damaged, pinched, or blocked fuel tank vapor line
* A disconnected or malfunctioning EVAP purge solenoid
* A disconnected or malfunctioning EVAP vent solenoid
* An open ignition feed circuit to the EVAP vent or purge solenoid
* A damaged EVAP canister
* A leaking fuel sender assembly O-ring
* A leaking fuel tank or fuel filler neck

Any of the above conditions can set a DTC P0440.

Mar 08, 2011 | 1999 Chevrolet Blazer

2 Answers

My check engine light comes on very often and everytime I've gotten it checked, they say it is the gas cap. I know I put the gas cap on right. Recently when I get gas, the pump clicks off like my tank is...


Yes, you need to try a new Vent Solenoid for the Emissions hoses on the venting system for the gastank. There is also another test which can find leaks in this system.

Not many Repair shops have a machine called a "Smoke Machine", but call around and compared prices. The test is really simple. The machine is hooked up to your gastank vent hoses. A special chemical smoke is forced into the vent system, and when a leak is found, you fix it.

You may replace a vent hose or just patch it, as a road hazard may have punctured it. Or the vent Solenoid could be leaking and the test will show that problem too! As I notice you are driving a 2008 Model, you could be covered for this repair by Warranty.

Actually, anything pertaining to Emissions leaking into the atmosphere would fall under the longer pollution coverage. I hope you find my solution very helpful.

Jan 20, 2011 | 2008 Ford Escape

2 Answers

Codigo p1440


EVAP System Vent Circuit Malfunction

This diagnosis detects leaks in the Evaporative Emission (EVAP) purge line using of vapor pressure in the fuel tank. The EVAP canister vent control valve is closed to shut the EVAP purge line. The vacuum cut valve bypass valve will then be opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP control system pressure sensor can now monitor the pressure inside the fuel tank. If pressure increases, the Engine Control Module (ECM) will check for leaks in the line between the vacuum cut valve and EVAP canister purge volume control solenoid valve.

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

Possible solution
- Loose fuel filler cap
- Leaking fuel filler cap


Hope helps (remember to rate this answer).

Jan 05, 2011 | 2000 Hyundai Sonata

1 Answer

My engine light is on . I have a code # E-0455


The PCM monitors vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid are turned on, allowing engine vacuum to draw a small vacuum on the entire evaporative emission system. After the desired vacuum level has been achieved, the EVAP purge solenoid is turned off, sealing the system. A leak is detected by monitoring for a decrease in vacuum level over a given time period, all other variables remaining constant. A large leak in the system causes DTC P0445 to be set.

If the desired vacuum level cannot be achieved in the test described above, a large leak or a faulty EVAP purge solenoid is indicated. This can be caused by the following conditions:

*Disconnected or faulty fuel tank pressure sensor.

*Missing or faulty fuel cap.

*Disconnected, damaged, pinched, or blocked EVAP purge line.

*Disconnected or damaged EVAP vent hose.

*Disconnected, damaged, pinched, or blocked fuel tank vapor line.

*Disconnected or faulty EVAP canister solenoid.

*Disconnected or faulty EVAP vent solenoid.

*Open ignition feed circuit to the EVAP vent or purge solenoid.

*Damaged EVAP canister.

Oct 22, 2010 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Obd-2 code p1455


DTC P1455 - Substantial Leak or Blockage in Evaporative Emission Control System

The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).

Check this possible causes:
After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube
EVAP canister purge valve stuck closed
Damaged EVAP canister
Damaged or missing fuel filler cap
Insufficient fuel filler cap installation
Loose fuel vapor hose/tube connections to EVAP system components
Blockages or restrictions in fuel vapor hoses/tubes (items also listed under disconnections or cracks)
Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked
Canister vent (CV) solenoid stuck open
Mechanically inoperative fuel tank pressure (FTP) sensor


Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank

Tell us news.

Jul 19, 2010 | 1996 Ford Explorer

2 Answers

What is he code 455 for a 2006 hyundai sonata means


CODE PO455 EVAPORATIVE EMISSION SYSTEM LARGE LEAK DETECTED.POSSIBLE CAUSES CANISTER VENT SOLENOID MAY BE STUCK IN OPEN POSITION / EVAP CANISTER TUBE EVAP CANISTER PURGE OUTLET TUBE OR EVAP RETURN TUBE DISCONNECTED OR CRACKED OR CANISTER IS DAMAGED / EVAP CANISTER PURGE VALVE STUCK CLOSED OR CANISTER DAMAGED / FUEL FILLER CAP MISSING LOOSE NOT TIGHT OR THE WRONG PART / FUEL VAPOR HOSES TUBES BLOCKED OR RESTRICED OR FUEL VAPOR CONTROL VALVE TUBE OR FUEL VAPOR VENT VALVE ASSEMBLY BLOCKED /FUEL TANK PRESSURE SENSOR HAS FAILED MECHANICAL FAULT /FUEL TANK CONTROL VALVE IS CONTAMINATED DAMAGED OR HAS FAILED.

Oct 21, 2009 | 2006 Hyundai Sonata

1 Answer

Replace leaking fuel tank


Remove the filler tube. Remove the rubber fuel line and plug. Remove the attaching bolts for the tank. Place a jack under the tank with a block of wood and slowly lower the tank down. Don't forget to unplug the wiring harness too. The possibility is high that the seam is leaking. A few aftermarket companies offer the tank. Do some shopping though, prices are different with the different companies.

Jun 19, 2008 | 1966 Ford Mustang

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