How To Start A Car With A Bad Fuel Pump?

If your car’s fuel pump fails, you won’t be able to start it and drive away normally. You might even have trouble starting it up in the first place, which could be frightening if you’re stranded far from home with no other mode of transportation. If this happens to you, don’t panic; there are a few things you should keep in mind about How To Start A Car With A Bad Fuel Pump?

The first step is to figure out what’s wrong with your car’s fuel pump and whether it can be repaired or replaced with an aftermarket unit. If you don’t know how to start your car, a bad fuel pump may appear to be an insurmountable problem, but it’s quite simple to fix. Follow these simple steps to get your vehicle back up and running in no time.

Start A Car With A Bad Fuel Pump

The Function Of A Fuel Pump

The fuel pump is located within the fuel tank. Most vehicles have a small electric motor that sends pressurized gasoline directly to the engine. Delivery of fuel to the engine powers the car. Fuel pump functions in conjunction with other critical mechanisms, such as the fuel filter and the fuel rail. The fuel pump sends gas to the rails through the filter.

The fuel is then delivered to the fuel injectors, which spray the gasoline into each of the engine’s cylinder combustion chambers. Automobiles have changed significantly. The fuel pump system in each car varies depending on the year it was manufactured and the car manufacturer.

Older vehicles have a mechanical fuel pump that is powered by a carburetor. To deliver fuel to the engine in newer cars, an electric fuel pump is used. Simply put, the two main types of fuel pumps used in cars today are electrical and second is mechanical. Here’s an overview of how these fuel pumps work.

The first is the Mechanical Fuel Pump. A camshaft drives a mechanical fuel pump. The pump siphons fuel from the pump and pushes it through to the carburetor, which delivers it to the engine while it is running. While the car is running, this process is repeated indefinitely.

The electric fuel pump is the second most common type. When the ignition key is turned to the “on” position in modern cars, the electric fuel pump is activated. Because the electronic fuel injection system causes high pressure, an electric mechanism rather than a mechanical module is preferable. Depending on the vehicle, the electric fuel pump could be inside the fuel tank or between the gas tank and the engine.

Mechanical fuel pumps are much quieter than electric fuel pumps and require very little effort to set up. A mechanical fuel pump is sufficient for daily drivers. The only disadvantage of this type of fuel pump is that it is only suitable for engines with less than 450 horsepower. Electric fuel pumps are available at a variety of flow rates.

The Location Of The Fuel Pump

The fuel pump is submerged in the tank of fuel. It is poised to draw fuel from the tank, force it into the fuel line, and deliver it to the engine. If you go around to the back of your car and look under the rear bumper, you’ll notice a sizeable chunk of metal fastened to the underside of the car with metal straps. That is a fuel tank. The fuel pump is located inside, and it may be difficult to access if you have no prior experience working on cars.

While replacing a bad fuel pump isn’t a hard task, it should be done carefully because even minor mistakes can lead to more difficult and costly repairs. To ensure that the job is done correctly the first time, we strongly advise having a qualified automotive expert diagnose and repair problems with your car’s fuel pump.

Bad Fuel Pump Affects Your Car’s Performance

When a car pump fails, the engine will typically turn over but fail to catch when you turn the key or press the starter button.

  • The damaged fuel pump is unable to supply enough fuel to the carburetor or fuel injector. Any dirt or debris sucked into your gas tank can cause the fuel pump to fail. Any dirt or debris sucked into your gas tank can cause the fuel pump to fail. Although today’s fuel pumps are designed to last for many years, there are no assurances, so they will ultimately fail.
  • The engine’s delicate air-fuel ratio (approximately 14.7:1, or 14.7 g of air for every 1 g of fuel, in case you were wondering) is out of whack.

In either case, your car often becomes an oversized paperweight, leaving you stranded in your driveway or somewhere far less safe.

Symptoms Of A Failing Fuel Pump

Although today’s fuel pumps are designed to last for many years, there have been no guarantees that they’ll never fail. Continuously keep no less than a quarter tank of gas in your vehicle.

You should expect to replace the fuel pump at some point during the life of your car. As with most mechanical components on your car, there are always warning signs of trouble before it fails. Here are some of the most common signs of a failing fuel pump:

  1. Weak Fuel Economy: Have you ever noticed a significant decrease in your car’s gas mileage? Weak fuel economy is frequently the result of a faulty valve that permits more fuel than required to leave the tank. When this occurs, the excess fuel is not consumed or stored, resulting in decreased fuel efficiency.
  2.  Reduction In Power: The fuel pump also regulates the amount of energy delivered to the engine. A faulty fuel pump will not be able to provide the surge of power required for a car to climb a hill or accelerate quickly when needed.
  3. Sporadic Surging: Another indicator that your fuel pump is failing is when your car begins to surge forward sporadically. This happens when the fuel pump encounters resistance in the engine.
  4.  Fuel Tank Noises: In old cars with mechanical fuel pumps, you may hear a low whining or howling noise coming from the gas tank.
  5. Engine Stagnation: When the engine stalls, even in hot weather, this is a sure sign that the fuel pump motor is failing.
  6. Doesn’t Start The Engine will turn over in the final stages of fuel pump failure, but you will be unable to start the car. This is a clear indication that the fuel pump needs to be replaced.
  7. Sucking Dirt Or Debris into your gas tank can cause the fuel pump to fail. As debris accumulates at the bottom of your gas tank, your fuel pump is more likely to be sucking in unwanted bits as your fuel levels drop.
  8. You should also try to Avoid Refueling At Run-Down, poorly maintained gas stations, as their gas may contain impurities. If their gas supply is contaminated with water, for example, your fuel pump and other parts of your fuel system may begin to corrode.

Causes Of A Fuel Pump To Fail

Fuel pumps run in tandem with the engine, delivering high pressure to the fuel rail as well as the injectors. Because the pump is always submerged in fuel, it remains cool and thus functional. If you commonly empty the tank before refilling it, the fuel pump is more vulnerable to overheating and will most likely fail before its expected lifespan.

When you turn off the engine with a low fuel level, fuel drains from the priming chamber, which is connected to the fuel delivery system. When you start the engine, the pump heats up and remains un-primed until the chamber is refilled with fuel. If this happens regularly, the pump motor will be burned out, causing the fuel pump to fail.

Step By Step Guide For How To Start A Car With A Bad Fuel Pump?

Certainly, there are three surefire methods for starting a car with a faulty fuel pump. You don’t need any mechanical skills to carry out these simple methods.

Fuel Pressure Indicator

When it comes to starting a car with a faulty fuel pump, a fuel pressure gauge can be extremely useful. This method is to diagnose a bad fuel pump, making it one of the most dependable ways to get the engine running.

This method is either a success or a failure. All you have to do is connect a fuel pressure gauge to the engine. A fuel pressure indicator is a helpful technique that monitors engine pressure levels to prevent damage to the fuel injectors and the fuel pump itself.

Apply Pressure Manually

When the fuel pump fails, there is insufficient pressure to pump gasoline through the fuel lines to the engine. You can start your car by manually applying that external pressure to the engine to get the gas flowing. You’ll have to get creative when it comes to providing manual pressure to pump fuel into the motor. Using an air mattress pump has proven to be effective for some.

Control Engine Heat

When you have a bad fuel pump, keeping the engine cool or preventing it from overheating is a good way to keep it running. This method will only work if you can start the car. To keep the engine from overheating, avoid driving for long periods. When the engine cools, the pump will reset, which will eventually stabilize the performance of your car.

The Carburetor Should Be Sprayed

This method is only applicable to old cars that use a mechanical fuel pump. Spraying the carburetor with carburetor cleaner or starter fluid may get your car started enough to get it to a mechanic. This method is either a success or a failure.

Troubleshoot An Electric Fuel Pump

Electric fuel pumps can be difficult to use. When an electric fuel pump fails, it is usually due to a blown fuse or faulty wiring. An electrical problem prevents power from reaching the fuel pump. When this happens, the engine will stall and burn whatever fuel is left in the fuel lines.

The Engine Control Module in modern automobiles is in charge of the car’s fuel delivery system. If the fuel pump failure is caused by a problem in the circuit or wiring, try resetting the ECM. If that does not solve the problem, the next step is to replace the fuel pump relay fuse. This may be able to start your car.

Tips For Extending The Life Of A Fuel Pump

It is far less expensive to prevent fuel pump failure than to replace the pump. The methods listed below should be used regularly to increase the longevity of your fuel pump.

  • Invest in high-quality fuel that is free of debris. Such fuel will cause damage before the impurities can be removed by a conventional inline fuel filter. Using high-quality, name-brand fuel usually prevents a slew of issues. Purchasing fuel only from high-volume stations is also beneficial.
  • Always keep the gas tank about a quarter of the way full.
  •  Perform regularly scheduled maintenance on the fuel system and filters. If necessary, repair or replace.
  • Do not deplete the fuel tank. Otherwise, the tank will overheat, shortening the life of the fuel pump.
  • Do not buy fuel while a tanker truck is filling the station’s tanks. This has the potential to stir up the debris that has settled in the tanks.

To Avoid Serious Side Effects, First Fix The Bad Fuel

Finally, here are a few pointers for extending the life of your fuel pump and possibly avoiding this issue entirely.

  • Never keep less than a quarter tank of gas in your vehicle.
  • Keep the fuel system and filters in good working order.
  • Maintain your vehicle regularly and take it in for regular inspections.


If your car begins to show symptoms of a faulty fuel pump, you should have it checked out as soon as possible. This way, you won’t get to the point where you can’t even start it. However, if the worst happens and you are unable to start the engine, perhaps try some of the techniques we discovered in this article about How To Start A Car With A Bad Fuel Pump? Will allow you to drive it to the nearest garage to have it looked at by a professional.

Frequently Asked Questions

Is it possible to drive a car with a bad fuel pump?

No, driving with a bad fuel pump is not safe because a bad fuel pump will not be able to supply the fuel system with constant fuel pressure. This means that your car will not start, will stall, and may even shut down at any time.

Will a bad fuel pump cause a car to fail to start?

Yes, one of the most common reasons for a car not starting is a faulty fuel pump. When your car pump is unable to supply gas from the tank to the engine, it will be difficult to start. The car will struggle to start and run because the pump is unable to push enough gas through. The pressure of a worn pump drops, leaving the engine without gasoline.

How does the fuel get from the tank?

This is determined by the type of fuel pump used. A suction line draws fuel from the gas tank via a small motor, which drives an electrical generator, which powers electric fuel pumps. Mechanical gasoline pumps, on the other hand, spin with the crankshaft and draw gasoline through a hose with a sucking function.

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