When you pull into the gas station, you see different colored handles that indicate the different varieties of fuel. While it’s difficult to miss the appropriate one for your vehicle, there are times when you could be distracted, inadvertently putting gasoline into your diesel engine. What do you do now?
In this article, we cover what happens to your diesel vehicle if you fill the tank with gasoline instead. We will also look at the differences between the fuel and tell you what to do next to mitigate damage.
Differences Between Diesel and Gasoline
Both diesel fuel and gasoline are refined from crude oil, but the two have many differences. For starters, diesel fuel is going to have a thicker consistency than gas does. It is also heavier, weighing a pound more than gas.
Gasoline evaporates, while diesel doesn’t. Plus, gasoline doesn’t contain lubricating properties, but diesel fuel does. Diesel is self-igniting at lower temperatures than gas, with diesel engines not using spark plugs for ignition.
On top of that, the diesel motor has a higher compression ratio than the gas engine does. All of the differences add up, causing the fuels to act very differently when put into the wrong engine.
What Happens if You Put Gasoline in a Diesel Engine?
If you put gas in a diesel engine it can cause damages to the fuel system like the fuel pump or fuel injectors. This is because gas does not have the same lubrication properties as diesel. It can also cause uncontrolled detonations damaging internal engine parts.
Some things can happen to your car engine if you fill your tank with gasoline instead of diesel. Here is a more detailed list of problems that could occur if you fill gasoline in your diesel engine:
1. No Ignition
The diesel engine simply wasn’t manufactured to ignite fuel. Unlike diesel fuel, gas wasn’t made to ignite automatically, which is why a spark plug is needed.
When gas is put into a diesel engine, there are no spark plugs to start the process. If the engine were to start, it would only be because there was enough diesel fuel mixed into the gasoline.
2. No Lubrication
Diesel fuel is very similar to oil because it also lubricates the internal components of the engine. Using gasoline in the engine provides none of this lubricant because it acts as a solvent instead.
Not only will gas contaminate the engine, but the lack of lubrication causes other troubles. If the engine runs, metal parts are going to rub together and become damaged.
3. Damage to Fuel System
It isn’t just the engine you need to worry about, but also the diesel system. This system is set up with special fuel filters, pumps and injectors, meant to handle diesel.
When you add gas to the system, you leave the door open for damage. In fact, you might need to replace the entire fuel system to repair the damage.
4. Uncontrollable Detonation
Inside the diesel engine, there are many parts moving, just like you would find in the gas engine. You will find pistons, rods and other moving components.
Because of the different weight and properties of gasoline, the diesel engine will detonate uncontrollably, creating a shock wave of events. The components simply won’t be able to handle this level of detonation, leading to irreversible damage.
5. Black Smoke
Diesel fuel has a flash point of 126-degrees Fahrenheit. In comparison, gasoline has a rated flash point of 70-degrees Fahrenheit.
Gas isn’t going to ignite in a diesel engine as well, leaving behind lots of unburned fuel. As a result, you might see black smoke pouring out of the exhaust. Not only is this dangerous to the system, but various sensors could also quickly clog because of the additional soot.
6. Severe Engine Damage
All of the previous conditions can lead to severe engine damage. If caught early enough, you could lessen the amount of damage done.
However, if you let the system run unchecked, you could damage the engine beyond repair. The longer you continue driving, the higher the chances are that you will need a new engine, which can become quite expensive.
What to Do if You Put Gas in a Diesel Engine
The moment you realize that you put the wrong type of fuel in your engine, you need to take steps to lessen the damage. Obviously, you don’t want to panic, which is easier said than done.
Follow these steps if you put gas in your diesel engine:
- Do not start the engine. The vehicle needs to sit right where it is until a tow truck arrives.
- Avoid turning on the ignition. This is not the time to turn on the radio. If you flip the key to the ON position, the fuel injectors and pump are going to activate.
- If you are already driving, pull off the road and park the vehicle until a tow truck can arrive.
- Get your truck towed to a reputable service center. If you are capable of doing the work yourself, have the vehicle towed home.
- Drain the entire fuel tank and flush the system. If the system was never turned on, you can remove all of the fuel and clean it out without any negative consequences.
Above all, avoiding putting gas into the diesel engine will save you from a lot of headaches. Pay attention when pulling into the fuel station to ensure you use the right nozzle.
Melinda
half tank of diesel in it he put some gasoline in it. Ca4 shut off on him. He called his mechanic the drained fuel tank and flushed system. Ran great for a day. On second day it shut off on me twice when i made slow turns. What can cause this??
Harold Fleischman
In light of the first statement of gasoline being mixed with diesel fuel I would like to respond with an actual incident that was broadcast on Public Radio about vehicles catching on fire due to a supplier of fuel to a filling station mistakenly filling a gasoline tank with diesel fuel which would have been a mix. The broadcast Stated that several vehicles caught on fire and the term explosion was used due to the mistaken filling of the gasoline tank with diesel. They broadcast on public radio that it creates an unstable mixture. This surprised me to think that was possible. This happened in the late 1980's in the Beaufort, SC area, maybe another town close by. Why could that have happened, for not just one car but several cars exploded/caught on fire. Both terms were used. Need to know for the company I work for does have both gasoline and diesel vehicles.
Santiago
What I did was soon as I realized that I had put 20+ gallons of SUPER UNLEADED into my 2000 7.3PowerStroke (Whie it was running)(40 gallon tank) @ 2:00am I turned it off, went in & bought $200 in ALL of the 1 quart oil bottles from the shelf.poured it ALL IN. pulled the fuel filter out, drained ALL the fuel out & filled it w/ motor oil. Fired it up & drive home (10 miles) Been driving it for 10 more years with NO ISSUES 260k miles...
Gitartha
Recently I have problem like this . I have around 12 ltr diesel in my tank and there in Fuel station fill 3.5 Ltr petrol in my car when i saw it I stoped feuling and drain all oils form car tank and refuel diesel 15Ltr and my car starts and run ok . My car was off when they felled petrol in tank. Even Not started after petrol filled. I have not changed any parts of my car it works fine.