Car Won’t Start After Getting Gas? – Here’s Why

Car Won’t Start After Getting Gas? – Here’s Why

Why Won't My Car Start After Getting Gas

Some car issues are incredibly irritating as they seem to come from nowhere. For instance, your car may fail to start immediately after filling it with gas.

This sounds strange, but it happens. So, if you find yourself in such a situation, don’t panic. Instead, you should find out why your car is behaving this way.

Depending on the problem, you can fix the issue or get in touch with a professional mechanic to fix it. Your car may fail to start because of a bad purge valve, faulty gas cap, or a bad fuel regulator. Identifying the problem in time and correcting it will help you avoid costly repairs.

In this post, we’ve highlighted some of the reasons and how to fix them. So, continue reading to find out.

Failed Fuel Pump

One of the main reasons your car may fail to start after getting gas is a failed fuel pump. The fuel pump’s work is to provide fuel from the gas tank to the engine at the ideal pressure need for optimal performance.

However, if your car reaches high mileage, the fuel pump may start to fail. If you continuously keep less than ¼ of a tank fuel in your vehicle, your fuel pump will fail.

Note that the fuel pump in the gas tank is kept cool. Thus, if the fuel was extremely low, then the pump will become extremely hot, and when you add cold fuel into the tank, the fuel pump will fail.

How To Fix It

First and foremost, you should get in touch with a mechanic to repair or replace the failed fuel pump. But if the fuel pump is okay, you will need to check the fuel pressure to observe if the pump is coming on.

And if it’s not, then the fuel pump’s voltage has to be examined to see if there is power. If there is power, you will have to replace the fuel pump.

Bad Evap Purge Valve

Another thing that can cause your car to fail to start after refueling is a bad Evaporative Emission Control (EVAP) system. The canister purge valve restricts the fuel vapors formed in your fuel tank from breaking loose into the atmosphere by trapping them in a charcoal canister.

Thus, if the purge valve is damaged, open, or closed, various problems will occur, such as the car failing to start.

If your purge valve is open, it forms a vacuum leak that can affect your engine. This is because air will enter the engine in quantity not warranted by your vehicle’s computer.

As a result, this will change your vehicle’s air-fuel ratio, causing problems starting. If this happens after filling your gas tank, then you need to fix it.

How To Fix It

Repairing a bad EVAP purge valve is simple as they are usually affordable and easy to install. Follow the vehicle’s manual properly, or you can also hire a professional mechanic.

Change the purge valve as quickly as possible, or your car’s emissions output levels will increase substantially.

Car Won’t Start After Getting Gas

Bad Fuel Pressure Regulator

Before you conclude that the fuel pressure regulator is making your vehicle stall, make sure that you check on the car’s battery. The battery can die because of excess drain from other accessories being left on for long.

However, if you have a bad or failing fuel pressure regulator, your vehicle will have trouble starting. In most cases, this problem manifests itself when you fill your gas tank with excess fuel. When there is more fuel than what your engine can handle, starting it will be a problem if the fuel pressure regulator is bad.

Note that the work of the fuel pressure regulator is to ensure the pressure on the fuel system is ideal for efficient combustion.

How To Fix It

If you notice that the fuel pressure regulator is failing, you should replace it right away. Unlike the other parts that we’ve looked t, replacing the fuel pressure regulator is easy.

Start by switching off the car, disconnect the fuel pressure regulator vacuum line, release fuel pressure, get rid of the failed device, and screw in the new device. When you are done, clear out the ECU memory and take the car for a test drive.

Bad Crankshaft Sensor

A bad crankshaft sensor can also affect how your car performs. The crankshaft sensor provides accurate timing information that allows fuel injectors to pump gas into the engine efficiently.

So, if it has an issue, the fuel injectors won’t pump gas into the engine in the right quantity, which may affect the starting of the vehicle.

How To Fix

Take your car for inspection to a professional mechanic. If the crankshaft position sensor has a problem, you should have it fixed or replaced if needed.

Failing Alternator

If your vehicle fails to start for no reason after getting gas, you may be having a bad alternator. Apart from using gas, your car also needs electricity to run. And the alternator delivers power to spark plugs, which ignites the gasoline in your engine.

Therefore, if the alternator is bad, there might not be a lot of power in the spark plugs to start the engine. As a result, this may cause the car to fail to start.

Note that this can happen to you even in the middle of a traffic jam. So, if you have a bad or failing alternator, you should get it fixed right away.

How To Fix It

Repairing an alternator is not easy. That’s why it would be in your best interest to take it to a mechanic.


If your car fails to start after getting gas, don’t panic as this happens. Instead, get a mechanic to help you to diagnose the problem. Even though the car may start after many attempts, you should not assume that it is fine as this can lead to a severe problem.

Since we’ve pinpointed some of the challenges that your car might be facing, you should know where to look at. Also, you can go ahead and fix it if you have automotive knowledge. But if not, just visit a mechanic to fix the issues for you.