How to Start a Car with A Bad Fuel Pump

Naomi O'Colman

How to Start a Car with A Bad Fuel Pump

How to Start a Car with A Bad Fuel Pump

For combustion, your vehicle’s engine needs a steady supply of fuel and oxygen. A functioning fuel pump also guarantees that the right amount of fuel is delivered. But what if your fuel pump breaks down? How to start a car with a bad fuel pump. Naturally, replacing a bad fuel pump is the best option. Today, I’ll show you how to start a car with a malfunctioning fuel pump. You will avoid being stranded on the road and will be able to safely drive to the nearest technician to have the fuel pump repaired or replaced.

What is a Fuel Pump’s Purpose?

Fuel pumps are one of your car’s most essential components. It is, after all, the one who ensures that fuel is sent from the gas tank to the engine. In its most basic form, a fuel pump transports gasoline or diesel from the fuel tank to the carburetor of an internal combustion engine.

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Under low pressure, mechanical fuel pumps transport fuel from the fuel tank to the engine via the carburetor. The gasoline is mixed with air inside the carburetor before being injected into the engine. Outside the fuel tank, mechanical fuel pumps can be found. The camshaft activates a diaphragm inside the carburetor that controls a switch on the fuel pump. The control switch can either pull the diaphragm down, enabling gasoline to flood into the carburetor or generate pressure to force the fuel out.

Electric fuel pumps send a positive electrical current via the gasoline lines, causing enough force to send fuel to the engine. An electrical ignition switch controls the required current. Until it reaches the cylinder, the gasoline in this system does not mix with the air.

Several operations that manage the car’s power are completed by the fuel traveling from the tank to the engine. The pump is one of the procedures that create the energy to start your car by causing the proper air/fuel mixture. When a car part breaks, there’s always the risk of engine damage, but if the fuel pump fails, the car won’t start.

Symptoms of a Bad Fuel Pump

You might be wondering when your gasoline pump is going to fail. Today’s fuel pumps are made to last, but there are no promises that the pump will work flawlessly for the vehicle’s life. Fortunately, the car will show signs of a bad fuel pump:

Gas mileage is insufficient

When we drive a car, we become familiar with the vehicle’s typical gas mileage. When your vehicle’s gas economy starts to drop, it’s possible that the fuel pump has a broken valve that permits more fuel than necessary to exit the tank. As a result, fuel will not be used or held in excess, resulting in lower fuel efficiency.

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Stalling in warm weather

A car might stall for various reasons, but if it stalls more frequently while it’s hot outside, it’s a sign that the fuel pump motor is starting to fail.


If your vehicle requires a rush of power, such as climbing a hill, carrying extra weight, or accelerating quickly, and there is insufficient power to fulfill the task, the fuel pump is too weak.

Engine of sputtering

When the automobile is moving at a constant pace and the engine sputters, the fuel pump isn’t feeding the machine enough fuel.

The fuel tank making noise

Low or damaged fuel in the gas tank can damage the fuel pump, creating an audible moaning or howling noise.


When the fuel pump inside the motor experiences resistance, the vehicle will surge forward while driving as if you pressed harder on the gas pedal.

Difficult ignition

The gasoline pump comes on with every engine start. The pump can deteriorate over time, leading to multiple attempts to start the engine. This is a common indication of a failing car battery, so it’s good to check it out.

No start

The car engine will turn over but not start. There are a few more possibilities, but the fuel pump may have failed.
how to start a car that has a faulty gasoline pump.

How to Start a Car with A Bad Fuel Pump

Driving your automobile with a bad fuel pump can quickly burn the pump’s motor and cause the engine to overheat. One of the most common indicators that your fuel pump fails is overheating. There are, however, several additional options for starting your automobile with a faulty gasoline pump.

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Invest in a fuel pressure gauge

One of the most effective ways to deal with a faulty fuel pump is to utilize a fuel pressure gauge. Mechanics trust this procedure.

Connect the pressure gauge to the engine of your vehicle. This way, even if the gasoline pump is terrible, you’ll be able to start your automobile, and you’ll have a better sense of the problem.

Apply pressure from outside

Applying external pressure is one option for starting a car with a malfunctioning fuel pump. The most severe problem with a malfunctioning fuel pump is that it tends to reduce the required pressure to operate the car, which might cause performance problems. As a result, applying external pressure as you start your car is the easiest way to address this. External pressure can assist in maintaining the required pressure for the engine to function.

Maintain the temperature of your car’s engine

When it comes to starting a car with a malfunctioning fuel pump, maintaining the engine’s heat can be a helpful answer. The pump will reset without heat or pressure when the car cools down. However, the vehicle will immediately malfunction and perform poorly due to this.

Maintaining enough heat on the engine is the best thing you can do to get a car started with a malfunctioning fuel pump. This can help to reduce your car’s frequent breakdowns and improve its performance.

While there are ways to get a car to run despite a malfunctioning fuel pump, you should fix the issue as soon as possible. If a malfunctioning fuel pump is ignored, it can lead to a slew of additional problems that will require money to fix.

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Fuel Pump Maintenance Tips

I recommend following these maintenance instructions now that your fuel pump is in good working order:

  • Purchase pure fuel.
  • Maintain a quarter-full gas tank. The pump will remain cool when submerged in gasoline. The pump will overheat and fail prematurely if this does not happen.
  • Fuel injector cleaners of good quality should be used. Impurities in the fuel might damage a fuel pump. Another advantage of using these gasoline cleansers is that they aid in improving the efficiency of your vehicle.

Remember that preventing fuel pump failure is significantly less costly than replacing it.


If you notice indications of a defective fuel pump in your vehicle, it’s essential to get it checked out as soon as possible. This way, you don’t have to deal with headaches on the road.

If the worst happens and you can’t start the engine, you might be able to get it to a garage and have it looked at by a professional if you try some of the procedures above.