Can You Use Brake Cleaner as Starting Fluid? The Real Risk

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Starting fluid and Brake cleaner- Two of them are different in their name and use! But, many people recommend using brake cleaner as starting fluid in their blogs, articles, or videos on the internet! Hence, the question can arise in your mind, Can you use brake cleaner as starting fluid?

The answer will be ” No.” You shouldn’t use Brake cleaner as starting fluid. Using brake cleaner, you’ll only flood your engine and the spark plug will get wet, but the engine will not start. Although the engine gets started for a while, you’ll damage your engine permanently with this cheap trick! 

Beyond engine damage, some chlorinated brake cleaner formulas can produce phosgene gas — a toxic compound — when they burn inside a combustion chamber. This guide covers why brake cleaner fails as a starter, the safer substitutes, and the correct way to use real starting fluid.

Are brake cleaner and starting fluid the same thing?

Although people are messing up the brake cleaner with starting fluid, they are very different from others. You can easily differentiate them according to their function, purpose & chemical used!  

The first thing you need to clarify about their function. The function of starting fluid is to start a combustion engine which is very hard to start. 

On the other hand, brake cleaner removes oil, debris, and dirt from the brake system and helps them function effectively. 

Starting fluid is a volatile, flammable liquid formulated to ignite easily in a cold engine. Brake cleaner is formulated to evaporate cleanly and leave no residue on brake parts, not to ignite predictably in a combustion chamber.

Brake cleaners contain toxic chemicals that can harm the environment, whereas starting fluid does not contain toxic chemicals and is safe to use.

The chemicals used in the starting fluid and brake cleaner are also different. Regular starting fluid contains-

• n Heptane: 70-80%
• Diethyl Ether: 15-20%
• Carbon dioxide: 10%
• Toluene: 0.465-1.86

Regular breaking cleaner contains-

• Acetone: 5-10%
• nHeptane: 40-50%
• Toluene: 10-15%
• Carbon dioxide: 1.5-5%
• Methanol: 30-40%.

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Can you use brake cleaner as starting fluid? 

Your engine won’t start! You have no starting fluid, but you just have an aerosol can of brake cleaner. And, at that point, you are questioning your mind, Can I use brake cleaner instead of starting fluid?

If you haven’t tried it yet, stop right now! Or, again, if you already use it on your engine, never use it again! You don’t want to ruin or damage your engine permanently,  right?

Following others’ opinions, I also tested this experiment on my Two-stroke and four-stroke engines! The brake cleaner I used was WD-40.  The result I get is a flooded engine and a wet spark plug. I attempted three-four times to start my engine. But, all attempts failed. (Source)

Although two-stroke engines were running for a while, it’s between 1-2 minutes highest. The bad smells of gasoline and WD-40 get in my nose and finally, I quit! 

By researching more, I found the exact answer to this question.

A brake cleaner contains toxic chemicals and doesn’t have the same chemical as starting fluid. It’s also hygroscopic and pulls moisture from the air on the engine. The rust can begin to rise on an engine. Hence, the brake cleaner down the engine.  

Only cleaning the braking system is its main function of it. Again, starting fluid work as lubrication and starts the combustion engine. Hence, the engine starts to run.

Meanwhile, many users say that brake cleaners will knock the oil off the combustion chamber’s walls. And you’ll get a dry start of your engine. Don’t forget that it will cause permanent damage in the future. 

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How to use starter fluid: Step-by-Step Guideline

Starting fluid is a very easy and effective tool to start your engine quickly. Whether you are searching for a starting fluid alternative, you are wasting your valuable time only! 

If you haven’t starter fluid, go to a hardware or automotive store and purchase one at only 3$-4$. Next, follow the guideline to get your vehicle’s engine working! 

Step 1: Inspect the engine 

Before using the starting fluid, check whether the engine is still working. Keep trying twice or three times. If you are sure it’s not working, go for the next step.

Step 2: Spray starter fluid on the air filter

Well, find the air filter on your vehicle and spray the starter fluid for 2-3 seconds on it.  

Note: Make sure to keep away your starting fluid from ignition sources. Because it is very flammable.

Step 3: Try to start the vehicle

N9w, it’s time to check whether the starting fluid is working. Give it a try to start the vehicle. And obviously,  you’ll get your engine working again! 

Is carburetor cleaner the same as brake cleaner?

As their name implies, brake cleaner is specifically designed to clean the braking system Whereas,  carburetor cleaner such as Berryman 0996-ARM B-9 Chem Dip Parts Cleaner is designed to clean carburetors. They use in different parts and for different purposes. So, they are not the same, right?

When you are trying to clean the brake system, you need to ensure an oil-free surface. That means brake cleaner will not leave any oil or residue after drying. 

But, carburetor cleaner requires to dissolve stubborn to remove dirt. So, there’s oil left on surfaces. This is the main difference between them.

Can you use carburetor cleaner as starting fluid? 

The answer is almost between yes and no! I don’t recommend carb cleaner as a starter fluid! 

Carburetor cleaner isn’t very flammable and leaves a residue on the surface. So, your engine gets down after its use! It’ll also jam a mechanism to function the engine effectively. 

Again, carburetor cleaner is not volatile or gas. You need petroleum-based lubricant as starting fluid.

Can you use starter fluid on a diesel?

You shouldn’t use starter fluid on a diesel engine. Starter fluid contains ether which has a low ignition point. So, it can explode in a diesel engine’s combustion chamber, damaging the piston.

Again, you can only use starting fluid on your diesel engine; there’s no electric preheat and installed system. 

Substitute for starting fluid 

The real fix is using actual starting fluid, an ether-based product designed for this job. Carburetor cleaner and throttle body cleaner are useful tools for their own jobs, but this guide is explicit that neither one is actually recommended as a starting-fluid substitute — keep real starting fluid in your toolbox instead.

Best Starting Fluid Pick

Prestone Premium Starting Fluid – $6.98

The actual product this guide’s Step 2 calls for — formulated for the job brake cleaner cannot safely do.

• Best for: The correct way to help a stubborn engine start, per Steps 1-3 in this guide
• Why we picked it: High ethyl-ether formula, no phosgene risk like chlorinated brake cleaner has
• Main drawback: Still flammable — keep it away from ignition sources as this guide warns

View Our Pick on Amazon

Compare safer emergency substitutes

Option 1 Sea Foam Engine Cleaner – $9.97 Best for: General engine cleaning, not a true starting-fluid substitute Why we picked it: Non-chlorinated, no phosgene risk if it ever reaches the combustion chamber Main drawback: Not formulated to actually help an engine turn over Check on Amazon

Option 2 Carburetor Cleaner – $7.49 Best for: Actual carburetor cleaning — not a starting-fluid substitute, per this guide’s own verdict Why we picked it: Leaves less toxic residue than brake cleaner if it ever ends up in the intake Main drawback: This guide is explicit: it does not recommend carb cleaner as a starter fluid Check on Amazon

Option 3 Throttle Body Cleaner – $8.98 Best for: Cleaning the throttle body, its actual job — also not a real starting-fluid substitute Why we picked it: Useful to have on hand for the maintenance this guide covers elsewhere Main drawback: Don’t reach for it as a shortcut to start a stubborn engine Check on Amazon

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Frequently Asked Questions (FAQs):   

Conclusion

Even in an emergency, brake cleaner is not a safe substitute for starting fluid — the phosgene gas risk from chlorinated formulas makes it worse than simply not starting the engine right away.

Real starting fluid costs about $3 to $4 and is the only product actually formulated for this job — keep a can in your trunk instead of reaching for brake cleaner.

Hopefully, you get your answer with this entire article. If you’ve any questions left, you can ask them below! That’s all for today! Say goodbye!!