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ETHANOL FUEL: What It's Really Doing to Your Engine

ETHANOL FUEL: What It's Really Doing to Your Engine

Car Connection Workshop Jan 20, 2026 48 min
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About this episode

Ethanol fuel is under scrutiny for its detrimental effects on engines, as Niall Motormouth Jenkins discusses the hidden costs associated with its use. He explains how ethanol, while initially marketed to support farmers, actually harms vehicle components by being acidic and hydroscopic, leading to corrosion and costly repairs. The episode dives into the science behind ethanol's impact on fuel systems, including rusting metal tanks and degrading plastic components. Listeners will gain insights into alternative fuel options and preventative measures to protect their vehicles from ethanol-related damage.

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Technical Too Afraid to Ask
Car

Jeep Wrangler

"Whether it's a 25 year old Jeep Wrangler getting a second chance at life, a Nissan Rogue getting its brakes back in order, or a mystery leak that's got everyone here scratching their heads."

The Jeep Wrangler is a tough vehicle designed for off-road driving. It's popular for outdoor adventures and has a loyal fan base.

Car

Nissan Rogue

"...a Nissan Rogue getting its brakes back in order, or a mystery leak that's got everyone here scratching their heads."

The Nissan Rogue is a small SUV that offers a lot of space and good gas mileage. It's often chosen by families for its comfort and safety.

Term

MAF

"Yeah, anybody know what a MAF is, M-A-F? Put it in the comments."

A MAF sensor is a part of the car that checks how much air is going into the engine. This helps the engine run better by mixing the right amount of fuel with the air.

Term

ethanol fuel

"you really ought to know more and more about the dangers of ethanol fuel. What it's really doing to your engine."

Ethanol fuel is a kind of fuel made from plants, often mixed with regular gasoline. It can be better for the environment, but it might harm some car engines, especially older ones.

Term

brake fluid

"...it's hydroscopic like brake fluid. You do not leave the cap off a bottle of brake fluid for more than pour out what you need..."

Brake fluid is a special liquid that helps your car's brakes work. It's important to keep it sealed because it can absorb water from the air, which can make your brakes less effective.

Term

hydroscopic

"However, hydroscopic means it attracts moisture. We don't want moisture in the fuel system."

Hydroscopic means that something can attract water. When it comes to fuel, this can be a problem because too much water can cause damage to the vehicle's fuel system.

Term

corrosion

"Creates what? Corrosion. Rust builds up."

Corrosion is when metal gets damaged due to reactions with water and air. This can cause parts of your vehicle to rust and break down over time.

Term

fuel system

"So if you have a vehicle with a metal fuel tank,"

The fuel system is the part of a car that holds and moves fuel to the engine. If it has problems, the car might not run well.

Term

fuel injectors

"when we're dealing with high tech engines, fuel injectors, fuel delivery systems, the whole nine yards."

Fuel injectors are parts of an engine that spray fuel into it. This helps the fuel mix well with air so that the engine can run smoothly and efficiently.

Term

fuel delivery systems

"when we're dealing with high tech engines, fuel injectors, fuel delivery systems, the whole nine yards."

Fuel delivery systems are the parts that move fuel from the gas tank to the engine. They make sure the engine gets the right amount of fuel to work properly.

Term

rubber compounds

"anything that's rubber, has a rubber compound to it in the fuel system delivery,"

Rubber compounds are materials made from rubber that are used in car parts, like hoses and seals. They can break down if they come into contact with certain types of fuel.

Part

fuel filter

"...I dumped out the contents of a fuel filter that was on one of my own cars, and I make sure I change the fuel filter minimum once a year, regardless of mileage..."

The fuel filter cleans the fuel that goes into your car's engine, making sure it's free of dirt and other harmful substances. Changing it regularly is important for keeping your car running well.

Term

micron

"...remove particles as small as 0.0001 of micron. That is super small, it's silt, basically."

A micron is a tiny measurement used to describe very small things. In cars, it helps us understand how small the particles are that a filter can catch.

Term

check engine light

"Money light, service light, check engine light, all the same daunting, okay?"

The check engine light is a warning light on your car's dashboard. It means there might be something wrong with the engine or emissions system, and you should get it checked out.

Car

Volkswagen

"...especially Volkswagen, they're plastic tanks. And that's what happens to them."

Volkswagen is a car company from Germany that makes many popular cars, like the Beetle and Golf. They are known for their quality and engineering.

Term

fuel rails

"So now we have fuel rails that hold the fuel injectors. So if you have a four cylinder engine,"

Fuel rails are pipes in a car's engine that carry gasoline to the parts that spray it into the engine. They help make sure the engine gets the right amount of fuel to run well.

Term

composite plastic

"there's a great chance it's made of composite. Fancy term for plastic, okay? We got this, as technicians, we got this figured out a long time ago."

Composite plastic is a type of material made by combining different kinds of plastics. It’s often used in cars to make them lighter and more durable.

Car

Toyota Corollas

"Here's what was discovered. It started in Corolla's quite a while back when the ethanol started coming, fuel leaks."

The Toyota Corolla is a popular small car that many people buy because it’s reliable and gets good gas mileage. It has been around for a long time and comes in different versions.

Part

fuel tank

"It's eroding the fuel tank from the inside. It's etching it. So the same thing happens."

The fuel tank is where your car's fuel is stored. If the tank is made of plastic, it can get damaged by certain chemicals in the fuel, like ethanol.

Term

fuel pressure

"making it thin to the point where the fuel pressure will find the leak at 60 PSI fuel pressure on average. Yeah, it'll find the weak spot for sure."

Fuel pressure is how hard the fuel is pushed through the system to reach the engine. If it's too low or too high, the engine may not run properly.

Term

moisture

"Water, it attracts moisture right out of the air and right out of the fuel tank."

Moisture is just water in the air or in things. In cars, it can cause problems by making parts rust or corrode.

Term

BTUs

"Ethanol does not create the same BTUs as gasoline. So here's the test and it's been done many times."

BTUs are a way to measure how much energy is in a fuel. It helps us understand how far a car can go on a certain amount of fuel, like gasoline or ethanol.

Term

gasoline

"Okay, so we want gasoline that is all gasoline. Fill the tank, see how far you drive on that tank."

Gasoline is the fuel that most cars use to run. It's a liquid made from oil that helps engines produce power.

Term

non-ethanol-based fuel

"...We have non-ethanol-based fuel. That's what you wanna put in your boats, two guys."

Non-ethanol-based fuel is gasoline that doesn't have ethanol in it. Ethanol can damage some engines, so this type of fuel is better for things like boats and jet skis.

Term

fuel fixer

"...I'll put in the description a product that I buy that is one of the best. It's called a fuel fixer."

A fuel fixer is a product you can add to your fuel to make it work better. It helps keep the fuel fresh and can fix problems that might happen if the fuel is old or has moisture in it.

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