What Does Check Fuel Fill Inlet Mean? How to Fix It?

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The “Check Fuel Fill Inlet” warning is a dashboard warning that can appear on modern vehicles, especially Ford. The warning is a part of the On-Board Diagnostics (OBD) system; it is a computer system that tracks the vehicle’s performance and makes sure all the electronics are working correctly. 

If the warning “Check Fuel Fill Inlet” has lit up on your dashboard, too, don’t worry; you can get rid of it by identifying the problem causing it and fixing it.


What is a “Fuel Inlet”?

The fuel inlet is the entry where the fuel nozzle is inserted. There are two types of fuel inlets: the standard one with a fuel cap and a rubber seal that prevents the fuel vapors from leaking. The other type is a capless system that has a flap that opens when the nozzle is inserted and closes when the nozzle is taken out. 


What Causes the “Check Fuel Fill Inlet” to Appear on the Dashboard?

The warning on your dash indicates some problem with the sealing of the fuel system. It can be triggered when you have no fuel cap on; the fuel cap starts leaking vapor, the fuel cap is damaged, there is a failure in the EVAP system, a damaged fuel tank pressure sensor, and more. 

In the next section, I will discuss the causes in detail, along with solutions. 


How Do We Fix the Problem?

Fixing the issue can be as simple as tightening the gas cap, or it can be a bit complicated and require repairing the EVAP system or a sensor. I have mentioned the solutions based on how common they are. So, make sure you perform the initial solutions first. 


Solution 1) Check the Fuel Inlet and Its Cap/Flap

Make sure the cap is screwed tightly on the inlet to prevent a fuel vapor leak that ends up triggering the warning. Do not tighten the cap too much; doing that can result in a damaged cap seal and would cause the vapor to escape the tank. Ensure the fuel cap has the rubber ring seal installed; as I mentioned, it can be damaged and fall out. Also, If the cap is missing, you will have to acquire the cap and screw it. 

Also, if your fuel inlet has a rubber flab system instead of the standard cap one, make sure the flap is closing properly. Sometimes, it can get stuck, or the spring that shuts it can become weak with time and unable to close the flap.  

If the cap is okay, inspect the fuel inlet, too, just to make sure it has no cracks or any sort of damage. Additionally, you can wipe the inlet with a cloth to remove any kind of obstruction.


Solution 2) Ensure the Evap System Is Working Properly

The Evaporative Emission Control System (EVAP) is responsible for capturing and storing fuel vapor from the fuel tank and preventing the vapor from releasing out. 

A leak or malfunctioning EVAP system will trigger the “Check Fuel Inlet” warning. To check if your EVAP is leaking, you can scan your car using On-board diagnostics (OBD II). if you get trouble codes P0455 or P0456, it means the EVAP is leaking. You will have to get it fixed by an expert to get rid of the issue and the warning. 


Solution 3) Check the Fuel Tank Pressure Sensor 

The fuel tank pressure sensor monitors the pressure inside the fuel tank. If the sensor starts malfunctioning and incorrectly measures the pressure, it will trigger the warning on the dashboard. 

Replacing the faulty sensor will fix everything. 

Solution 4) Inspect the Charcoal Canister and Canister Purge Solenoid

Charcol Canister stores fuel vapors from the fuel tank, and the Canister Purge Solenoid regulates the release of fuel vapors from the charcoal canister into the engine.

You must inspect all the hoses around the canister, make sure the Charcol Canister has no clogs that can affect the system’s pressure and trigger the warning. There should not be a leak; there have been cases where a leak near the Canister Purge Solenoid caused the issues. 


Can You Drive With the Check Fuel Fill Inlet Warning?

Technically, you can for a short period of time, but it’s not recommended unless it’s really important. It’s better to diagnose and fix the issue as soon as possible. 


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