Mercedes Mullins
There are several reasons why a fuel pump may not ignite diesel. Firstly, diesel and petrol/gasoline are fundamentally different fuels that work in different ways. Diesel engines are known as 'compression ignition' engines, which means diesel fuel is injected into a cylinder full of compressed air at high pressure and temperature, causing the fuel to ignite. In contrast, petrol engines use thinner, lighter, and more volatile fuel that is ignited by a spark. These two types of fuel and engines are incompatible, and neither fuel will work in an engine designed for the other. Additionally, issues with the fuel pump itself, such as a faulty fuel pump relay, a bad ignition switch, or a triggered fuel cut-off switch, could prevent ignition. Other factors, such as low engine compression, clogged fuel injectors, or a malfunctioning crankshaft position sensor, can also contribute to ignition failure.
| Characteristics | Values |
|---|---|
| Fuel Type | Diesel |
| Issue | Fuel pump won't ignite |
| Possible Causes | Dead fuel pump, faulty fuel pump relay, bad ignition switch, triggered fuel cut-off switch (inertia switch), or ECU control issues |
| Fuel Property | Heavy, low volatility, doesn't burn well |
| Engine Type | Compression ignition |
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What You'll Learn
A faulty fuel pump relay
One of the first symptoms of a faulty fuel pump relay is an engine that suddenly stalls. Other symptoms include performance issues, a check engine light on the dashboard, and a completely dead engine. In some cases, the fuel pump may not make any noise when the ignition is turned on, indicating a possible issue with the fuel pump relay.
To diagnose a faulty fuel pump relay, you can use a multimeter to check for voltage on specific pins. By checking for voltage on pins 87 and 30, as well as pins 85 and 86, you can identify potential issues with the relay or a broken fuse. Additionally, jump-starting the vehicle may temporarily resolve starting issues as fuel pump relays perform better at higher voltages.
The fuel pump relay is usually located in the fuse box under the dashboard or in the engine bay. It is a simple component, but it plays a critical role in the proper operation of the vehicle. A faulty fuel pump relay can render the fuel pump inoperable, causing drivability issues and preventing the engine from starting.
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A bad ignition switch
A faulty ignition switch may cause the engine to stall while the engine is operating. If the ignition switch fails while the engine is operating, it may cut off power to the ignition and fuel systems, causing the engine to stall. Depending on the exact issue, the vehicle may or may not be able to be restarted a short while later. An engine that refuses to start could be a sign of a bad ignition switch. The ignition switch sends power to the starter motor, engine controls, and ignition controls. If the ignition switch isn't working properly, these systems may not receive the power they need to start up.
Other symptoms of a bad ignition switch include the engine continuing to run even after you've removed the key, and the ignition key getting stuck when turning on the car or removing the key. In some cases, a bad ignition switch may cause the vehicle to start and then suddenly stall. If the ignition switch fails at the “on” position, it may result in the vehicle starting and then immediately stalling.
If you're experiencing issues with your ignition switch, it's recommended to have your vehicle inspected by a professional technician to determine if the switch needs to be replaced.
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A triggered fuel cut-off switch
When the ignition is turned on, a low-voltage signal is sent to the fuel pump relay, which then closes the main fuel pump circuit, powering the fuel pump. The fuel pump then starts to pressurize the fuel, even before the engine is started. If the fuel pump is not turning on, it could be due to a triggered fuel cut-off switch, among other potential issues.
To reset the fuel cut-off switch after a collision, you must first locate it. The switch is usually hidden in various places, depending on the car model. Common locations include behind or below the glove compartment, on either the right or left side of the vehicle. Once located, simply press the reset button on the switch. In some cases, the switch may be stuck, preventing the reset button from being pushed. To address this, gently push the button 20 to 30 times to loosen it, and then try to push it all the way down.
Before resetting the fuel cut-off switch, it is important to check for other potential issues that may be preventing the engine from starting. This includes checking the fuel pump relay, its connector, and wiring, as well as the fuse for the fuel injector and the fuel pump. Additionally, inspect the fuel filter for clogs and check for any leaks in the fuel supply, which can cause low fuel pressure. By addressing these potential issues, you can ensure a proper reset and improve the chances of a successful engine start.
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A dead fuel pump
There are several warning signs that your fuel pump may be failing. Firstly, a failing fuel pump may cause performance and drivability issues, such as reduced gas mileage, lower horsepower, and difficulties accelerating or driving uphill. Secondly, a failing fuel pump may cause your engine to sputter or stall while driving, indicating that the engine is not receiving enough fuel. Thirdly, a failing fuel pump may cause your engine to overheat, which can lead to stalling and potential damage to your engine. Lastly, a failing fuel pump may result in power surges while driving, causing dangerous speed spikes and drops.
If you suspect that your fuel pump is failing, it is important to address the issue promptly to avoid potential breakdowns and costly repairs. You can test your fuel pressure using a fuel pressure gauge to determine if the pump is failing. In many cases, replacing the fuel pump is the best solution. Additionally, keeping your fuel tank at least a quarter full can help prolong the life of your fuel pump by preventing overheating.
It is worth noting that there are other potential causes for ignition failure in your vehicle, such as a faulty fuel pump relay, a bad ignition switch, a triggered fuel cut-off switch, or issues with the spark plugs, crankshaft sensor, or security system. Therefore, it is recommended to consult a certified technician to accurately diagnose and address any issues with your vehicle.
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Using gasoline in a diesel engine
Diesel and gasoline are the world's primary vehicle fuels, but they are designed for different engines and are not interchangeable. Each engine type is specifically engineered to work with a certain type of fuel, and using the wrong one can cause immediate and long-term damage.
Diesel fuel is thicker, oilier, and more viscous than gasoline. It has a higher energy density, providing more power per unit than gasoline. Diesel engines are designed around the principle of compression ignition. In these engines, air is compressed to a high temperature, and when diesel is injected, the fuel ignites due to the heat of the compressed air. Diesel has a higher flashpoint than gasoline, and it is slower to evaporate.
Gasoline, on the other hand, is lighter, quicker to evaporate, and more volatile. It is used in spark ignition engines, where it is mixed with air, compressed by pistons, and ignited by spark plugs. Gasoline ignites at a lower temperature than diesel.
If you accidentally fill a diesel engine with gasoline, do not start the engine, as this will circulate the wrong fuel and increase the risk of damage. Inform the gas station staff, secure the vehicle, and call for professional help to have your vehicle towed to a garage or dealership.
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Frequently asked questions
Diesel engines are known as 'compression ignition' engines. Diesel fuel has low volatility, so it is injected into a cylinder full of compressed air at a high pressure and temperature, which causes the fuel to ignite. If the fuel pump isn't working, it could be due to a faulty fuel pump relay, a bad ignition switch, or a triggered fuel cut-off switch.
A fuel pump not working could be due to a dead fuel pump, a faulty fuel pump relay, a bad ignition switch, or a triggered inertia switch.
Symptoms of a faulty fuel pump include a check engine light, poor performance, difficulty starting the car, random stalling, rough idle, and hesitation or jerking.
No, gasoline cannot be used in a diesel engine. Diesel and gasoline are totally different fuels and are not compatible with each other. Gasoline requires a spark to ignite, whereas diesel engines use compression to ignite the fuel.
