Katerina Swanson
A fuel pump is an essential component of a car's fuel system. It is responsible for delivering fuel from the tank to the engine, and when it malfunctions, the engine will not receive the correct amount of fuel at the right time, leading to various issues such as hard starting, engine surging, sputtering, or stalling. While a bad fuel pump often requires replacement, there are temporary fixes to get your car running so you can drive it to a mechanic. This article will discuss how to identify a faulty fuel pump and provide some short-term solutions to get your vehicle started.
How to start a car with bad fuel
| Characteristics | Values |
|---|---|
| Engine temperature | If the temperature gauge rises while driving, it could be a sign of a bad fuel pump. Let the engine cool down for 8 hours before trying to start the car again. |
| Noise | A loud whining noise from the fuel tank could indicate that the engine isn't receiving the correct amount of fuel. |
| Starting issues | If the engine cranks or has difficulty starting, the fuel pump may be suffering from advanced wear and tear. |
| Power loss | If the car loses power when accelerating or driving uphill, the fuel pump could be faulty. |
| Fuel economy | If your gas mileage decreases, the fuel pump may have a faulty valve, causing too much fuel to escape the tank. |
| Manual external pressure | Applying an external pressure source, such as hooking up an air pump to the gas tank, can help start the car. |
| Fuel pressure gauge | Attaching a fuel pressure gauge to the engine can help diagnose whether the pump is faulty and aid in starting the engine. |
| Towing | If the car won't start, it's best to have it towed to a mechanic to replace the fuel pump. |
| Temporary fixes | Some temporary fixes include tapping the fuel tank with a hammer, applying heat or ice, and using starting fluid. However, these are short-term solutions, and a professional repair is recommended. |
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What You'll Learn
Apply manual external pressure to the fuel pump
If your car's fuel pump is failing, you can try applying manual external pressure to get your vehicle started. This method manually replicates the pressure needed to start your car by applying an external pressure source.
To do this, hook up an air pump to your gas tank and run it until the tank becomes pressurized. This will help maintain the crucial air-to-fuel ratio that makes the combustion process possible in internal combustion engines.
It is important to note that this is only a temporary solution, and you should still bring your car to a mechanic as soon as possible for a proper diagnosis and repair. Driving with a bad fuel pump can be dangerous and may damage your engine or start a fire.
Additionally, there are other temporary fixes you can try to start your car with a bad fuel pump. These include hammer tapping, using heat or ice, and using starting fluid. However, these are short-term solutions, and it is essential to fix the issue properly by seeking professional help.
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Let the engine cool down
If your car has a bad fuel pump, it's best to get it towed to a mechanic. However, if you're in a pinch and need to get your vehicle started, letting the engine cool down can help. Here's how:
First, it's important to understand why letting the engine cool down might help. High temperatures are a sign that your fuel pump could be failing. When the fuel pump malfunctions, the engine doesn't receive the correct amount of fuel, leading to an excess of heat with no fuel to ignite. This causes the temperature to rise slowly the longer you run your car.
To address this, turn off your car and let the engine cool down completely. This may take up to eight hours, but it's important to give the fuel lines time to equalize and the vehicle's computer system a chance to reset. During this time, the fuel pump may also reset without the need for external pressure.
While you wait, you can inspect the fuel in your tank. Open the fuel tank and check for any discoloration or contamination. If your fuel appears dirty, you may need to replace it or clean your tank.
After the engine has cooled, try starting your car. If it starts, drive it to a mechanic as soon as possible. A bad fuel pump can damage your engine or start a fire, so it's important to get it checked out by a professional as soon as you can.
Remember, letting the engine cool down is a temporary solution. For a more permanent fix, you'll need to have your fuel pump replaced by a mechanic.
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Attach a fuel pressure gauge
If you suspect that your car's fuel pump is faulty and you're having trouble starting the engine, you can try attaching a fuel pressure gauge to diagnose the issue and potentially get your engine started. Here's a detailed guide on how to attach a fuel pressure gauge:
Park Your Car and Prepare the Engine
Start by parking your car on level ground and engaging the parking brake. Allow the engine to cool down completely before proceeding. This is important for safety and to ensure the pressure readings are accurate.
Locate the Fuel Pressure Test Port
Open the hood of your car and locate the fuel pressure test port. It is usually found under the hood, near the fuel tank, or along the fuel line. Refer to your vehicle owner's manual if you're unsure of its exact location.
Attach the Fuel Pressure Gauge
Once you've located the test port, attach the fuel pressure gauge according to the manufacturer's instructions. The gauge typically has an attachment nut that you need to tighten securely. Make sure you have a rag or towel handy to catch any fuel spills or drips during the process.
Start the Engine and Record Pressure Readings
With the fuel pressure gauge securely attached, start the engine and observe the gauge. Record the PSI (pounds per square inch) reading displayed on the gauge. Compare this reading to the recommended pressure for your vehicle, which can be found in the owner's manual.
Interpret the Pressure Readings
If the pressure reading is significantly lower than the recommended level, it indicates a problem with the fuel pump or injectors. Low fuel pressure can cause various issues, including hard starting, engine stalling, sputtering, and poor fuel efficiency. If the pressure is within the acceptable range and steady, the issue may lie elsewhere in the engine.
Consult a Mechanic
After taking the pressure readings and interpreting the results, it is essential to consult a professional mechanic. They will be able to accurately diagnose the issue and provide necessary repairs or replacements. Do not delay seeking professional assistance, as driving with a faulty fuel pump can be dangerous and may cause further damage to your vehicle.
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Check for a blown fuse and/or low pressure in the fuel line
If your car won't start due to bad fuel, the fuel pump is likely not functioning properly. The fuel pump is responsible for delivering fuel from the tank to the engine. If it's not working, the engine won't receive the fuel it needs to run.
To check for a blown fuse, first locate the fuse box by consulting your owner's manual. Then, find the fuse that corresponds to the fuel pump and remove it. Inspect the fuse for signs of failure—if it's blown, it will appear broken or burned. If the fuse is intact, check the rest of the fuses related to the fuel system and replace any that are blown. If no fuses are blown, listen for the fuel pump relay clicking on as someone turns the key.
If the fuse is blown, try replacing it and starting the vehicle. If the new fuse blows, there is likely a direct short that needs to be diagnosed by a professional. You can also check the voltage at the pump to ensure it's receiving power. Consult your vehicle's service manual to determine the proper procedure for checking the voltage.
Low fuel pressure can also cause issues with starting your car. To check the fuel pressure, you'll need a fuel pressure gauge, which you can purchase or borrow from an auto shop. Locate the fuel pump test point, usually near the fuel injectors, and attach the gauge to the separation joint or test port. Have someone rev the engine while you observe the gauge. If the needle doesn't move or moves very little, low fuel pressure is likely the issue.
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Get the vehicle towed to a mechanic shop
If your car won't start due to a bad fuel pump, it is safest to get the vehicle towed to a mechanic shop. While there are temporary fixes you can try, such as hammer tapping, using heat or ice, and starting fluid, these are short-term solutions and carry risks. For example, continually driving with a bad fuel pump may damage your engine or start a fire. Therefore, calling for a tow truck and getting a professional repair is often the safest choice.
If you are unable to get your car towed immediately, you can try some troubleshooting tips to confirm that the issue is, in fact, the fuel pump. First, check how much fuel you have left on the fuel gauge and make sure it is of good quality by checking whether it is clean. To do this, open the fuel tank and inspect it for any discoloration or contamination. If you suspect the fuel pump is faulty, you can try to start your car a couple of times. If this doesn't work, you can try some temporary fixes, such as using starter fluid or tapping the fuel tank to dislodge a stuck fuel pump. However, these are not long-term solutions, and you should still plan to get your car to a mechanic as soon as possible.
If your fuel pump is bad, you are on a race against the clock. Your vehicle will likely start overheating soon, so if you need to drive it to a mechanic shop, do so slowly and avoid unnecessary acceleration. Bring a fire extinguisher with you as a precaution in the rare chance your engine catches fire.
Once you arrive at the mechanic, they will be able to replace your fuel pump. They will remove the old pump and put in a new one, which will get your car running normally again. This is a more permanent solution compared to temporary fixes and will ensure your fuel system works well. To prevent future issues, you can also ask the mechanic to check the fuel filter, as a clogged filter can cause similar problems to a faulty fuel pump.
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Frequently asked questions
A loud whining noise coming from the fuel tank, a hard start, loss of power, and poor fuel economy are all signs of a bad fuel pump.
The best solution is to replace the pump. If you are unable to do that yourself, get your car towed to a mechanic to prevent further damage.
Yes, there are some temporary fixes you can try to get your car to a mechanic. You can try hammer tapping, using heat or ice, and starting fluid. You can also try to manually apply external pressure by hooking up an air pump to your gas tank and running it until the tank becomes pressurized.
You can use a fuel pressure gauge to check the health of your fuel pump. You can also try listening for a whirring sound when you turn on your car. If you hear nothing, your fuel pump may not be working.
If you continue driving with a bad fuel pump, you risk damaging your engine or starting a fire.
