created by man Cunningham in Bodywork,Diagnostic,Electrical Faults,Electrical Repairs,Fuel,Maintenance care & Repair,Troubleshooting

Cars sometimes hit girlfriend with difficulties that just can’t it is in ignored. A jammed gas flap has actually happened come me more than once, but then i drive standard cars, for this reason you intend these types of challenges.

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Gas flaps have a secret emergency release take care of fitted in the trunk behind the cover. Pulling the release opens the gas flap.

In this post, I’ll show you how to locate and also operate your emergency gas flap. I’ll explain the different types of systems and also list their common faults.


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Common Gas Flap Problems

Here we’ll watch at every of the equipment in a little more detail. Together the gas flap locking and also releasing species vary so also will the typical faults. If your car is much less than two decades old, you’ll likely have actually an electric motorized gas flap, it’s the many common type and the one we’ll look in ~ first.

Motorised Gas Flap usual Problems

You already know that your automobile is run by various control modules. You have actually probably heard that the ECM (Engine regulate Module) aka PCM, that manages the engine. The gas flap doesn’t have actually a specialized controller, instead, that will likely be regulated by the body manage module or the central electronic module or possibly a main locking manage module.


A locking gas flap is incorporated into the locking system. Unlocking the car also unlocks the gas flap. If her passenger doors room unlocking without concern then her gas flap must too. If however, her passenger doors aren’t opening, the problem may lie v the central locking module and also not the gas flap itself.

Troubleshooting your trouble should begin by collection as much info around the error itself. Because that example, walk this trouble coincide with an altering a level wheel, fitting any kind of accessories or poor weather events, etc?

Or did any type of other features of the car fail at the exact same time? some cars might lock the rear doors, trunk, and gas flap elevation of the prior doors. That form of error would allude to a module issue and also not your gas flap.

This is the type of detective work that will assist isolate the problem.

Common problems include:

Flap lock bindingFaulty flap lock motorFaulty flap lock motor wiringFaulty control module

A binding flap lock is an extremely common. If for example, resourceful thief make the efforts to force the flap open, the locking pin might bend and also fail to retract fully when unlocked.

Retracting the lock through hand removed the pin and also straightening will settle this issue. Come test because that faulty flap lock motor, examine for strength at the gas flap once you unlock the car, follow these an easy steps.

What you’ll need for this test:

A check light, or Voltmeter

Gain access to the gas flap motor.Lock the stems latch (car no lock through latch open).

A reading of 12v or a light tells girlfriend the engine is gaining power, and if it’s no binding, your motor has actually failed.


If you uncovered no strength at the wiring, read on. Test because that faulty flap lock wiring – If friend don’t have any type of voltage, friend may have a wiring or a module fault. Go ahead and also check power and also ground independently.

Air operated Gas Flap

The air-operated main locking system consisting of gas flap was common during the ’80s and also 90’s cars. It operates by having an air pump commonly in the stems or under the behind seat pump air through plastic pipes to the diaphragm actuator.


Pumping air come the activators unlocked the flap and reversing the engine to create vacuum locked the flap. One activator with its own pipework to be fitted come door locks, trunk, and gas flap lock. If her door locks aren’t locking/unlocking as normal, diagnose the problem prior to looking in ~ the gas flap lock.


Common troubles with this form of device include:

Binding flap lockDamaged air supply pipeDry rotted rubber air it is provided fittingFaulty actuator diaphragm

A binding flap lock is common. If because that example, an enterprising thief do the efforts to pressure the flap open, the locking pin may bend and fails come retract fully when unlocked. Retracting the lock by hand remove the pin and straightening will resolve this issue.


Checking air supply pipes is easy, this device is straightforward to troubleshoot. If all various other doors are locking and also unlocking then it’s most likely an problem with the air supply or the actuator.

Locate the flap assembly and also check the pipework is in place.Lock the tribe latch (allows girlfriend activate the main locking)Remove the pipe and also check because that air and also vacuum together you lock and also unlock the car.

No air argues a damaged pipe or connector additional up the line in the direction of the pump. If, on the other hand, you have actually air, the diaphragm actuator has actually failed, instead of will settle the problem.

The diaphragm actuator is a straightforward air-tight cylinder the moves a metal lever arm. You deserve to test that by blow air right into the port and also watching the rod lever move, applying a vacuum should retract it.

If it doesn’t work, you uncovered your problem.

Cable activate Gas Flap

The cable-operated gas flap is the simplest of all to problem solve. Common problems include:

Binding flap lockBroken braided cableDetached braided cable

The problems with this system really don’t need lot explanation. Inspect the following:

Cable linked at flap release regulate (drivers compartment).Cable connected at the flap lock assembly (trunk).Check if cable is broken.

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Related Questions

Pry open up a gas tank door? Prying open the gas tank door is no required. Rather use the emergency gas door release handle surprise in the trunk, behind the gas door assembly.