Is your lawn mower sputtering and struggling to start? You need the right fuel to keep your grass looking neat. Choosing the correct gas for your lawn mower is more important than you might think. Using the wrong type can cause serious engine problems, leading to frustrating repairs and wasted money.
Many homeowners feel confused by all the labels at the gas station. Should you use regular unleaded, ethanol blends, or something else? These decisions directly affect how well your mower runs and how long it lasts. It’s frustrating when a simple task like mowing the lawn turns into a mechanical headache because of fuel confusion.
This guide cuts through the noise. We will clearly explain what gas types work best for different mowers. You will learn how to protect your engine and ensure a smooth, powerful cut every time you start up. Keep reading to become a lawn care expert and finally choose the perfect gas for your machine.
Top Gas For Lawn Mower Recommendations
- Pre-blended for outdoor power equipment - TruFuel provides the perfect fuel for all 4-cycle, air-cooled engines requiring a 50:1 mix
- For use in 4-cycle engines, Value Bundle of 2
- Specifically for portable gas-powered equipment - convenient, saves time and delivers superior performance
- Reduced aromatics and consistent vapor pressure lead to a cleaner burning fuel with the addition of a full synthetic oil and the guaranteed correct mix ratio for your equipment; Extends equipment life and ensures proper break-in for new equipment
- Easier start-up, increased trigger response and smoother idling with no smoke or plug fouling
- TruFuel Pre-Blended 2-Cycle Fuel for Outdoor Equipment - 32 oz. (2-Pack, 50:1)
- Auto Choke Engine - 5.8 ft.lb torque 144cc 4-stroke OHV engine with no primer, no choke starting.
- Cutting Height - 8-position single lever four-wheel synchronized height adjustment from 0.7" to 3.2".
- Mowing Convenience - 7" rear/6“ front double ball-bearing wheels achieve smooth movement, comfortable foam-wrapped angled grip eliminates grasp fatigue.
- Durable Cutting Deck: 20" cutting deck and specialized blade delivering a clean, even cut. Enjoy years of high efficient mowing with superior cutting quality
- Note - Do not dump or turn the mower over to avoid oil entering the combustion chamber.
- Powerful 144cc OHV Engine - Equipped with a 144cc Rato RV145-S 4-stroke OHV gas engine delivering 3.4HP max power, 2.5kW at 3600 RPM, and 7.8N.m max torque at 2500 RPM for consistent cutting performance and residential lawn maintenance.
- Durable Steel Cutting System - Features a 20-inch steel deck and 20-inch straight mowing blade for wider cutting coverage, efficient grass trimming, and long-lasting outdoor durability.
- Dual-Lever 6-Position Height Adjustment - Adjustable cutting heights from 0.6" to 2.4" with dual-lever 6-position control for flexible mowing performance across different grass conditions and lawn types.
- Push-Type Side Discharge Design - Built with a push walk-behind mower structure, side discharge chute, and 7-inch front and rear wheels for stable maneuverability and continuous grass clipping discharge.
- Large Fuel & Oil Capacity - Includes a 27.1 fl.oz fuel tank and 16.9 fl.oz oil capacity to support extended mowing operation with reduced refill frequency and dependable engine performance.
- 594061 Fuel Tank Cap for B&S Lawn Mower Gas Tank Caps
- Replacement Fuel Tank Cap
- If the gas caps become loose due to cracked, worn out, or stripped threads over time, the cap should be replaced. It is recommended that you use this cap with an additional gasket to make the cap fit more snugly.
- Includes tether to attach the tank cap to engine
- Package list: 1x Fuel tank cap, 1 x O-Ring
- 【Replacement Part Number】 Fit for 84004660, 590568 BS-799585
- 【Fit Models】 Designed for These engine models, including E450 E500 590568 BS 08P502 09P602 09P702 Lawn Mowers with BS-799585 Fuel Cap
- 【Top Quality】 Made of high-quality ABS material plastic, which ensures that the product is durable, sturdy and long-lasting. Unlike some other fuel tanks, it is designed to withstand harsh environments, making it ideal for use as a backup or primary fuel storage container. This material was specifically chosen for its ability to withstand extreme temperatures and rough handling, so you can be confident that it will last a long time.
- 【Easy Installation】 Fuel Tank with Cap is easy to install, no c licated operation is required, convenient for using, save your time and energy. more convenient and practical to use, and perfectly matched with the original equipment.
- 【Why need a replacement?】When your fuel tank cracks, there is a risk of fuel leaks, fire or fuel contamination. Replacing a new fuel tank keeps engine fuel clean, ventilated, and safe, enabling your outdoor power equipment to operate at peak performance
- For BS and Mur-ray Lawn Mower, Replaces part number: 7601092, 7601092MA,94073, 94073MA, 690294MA, 690280
- Compatible with Lawn Tractor Models: 2690892 - EBL155420H, 15.5HP 42" (2010), 2690997 - MT145380, 14.5HP 38" (2012), 2690998 - MT155380H, 15.5HP 38" (2012), 2690999 - MT155420H, 15.5HP 42" (2012), 2691197-00 - MT145380, 14.5HP 38" (2013), 2691198-00 - MT155380, 15.5HP 38" (2013), 2691199-00 - MT155420H, 15.5HP 42" (2013), 405000x31A 40", 405000x8A 40", 405000x8B 40", 405005x99A 40", 405007x18A 40", 405030x48A 40", 40508x92G 40", 40508x92H 40", 405601x30A 40", 405601x50A 40", 425000x8A 42", 425002x99A 42", 425007x92B 42", 425007x92C 42", 425303x92B 42", 425306x48A 42", 425307x24A 42", 425600x31A 42", 425615x30A 42", 425615x50A 42", 425618x48A 42", 312000x68A
- Compatible with Lawn Tractor Models: 7800292 (385002x108C), 7800412 (EYK125380), 7800303 (425621x108D), 7800410 (ELT155420G), 7800411 (ELT155420H), 7800413 (EYK155420G), 7800414 (EYK155420H), 7800399 (ELT175460H), 7800400 (ELT12460H), 7800416 (EYK12460H), 7800274 (312006x11E), 7800275 (309006x78C), 7800276 (385048x114), 7800277 (385048x51A), 7800294 (385002x78D), 7800319 (385048x151), 7800278 (405021x114), 7800279 (405021x51), 7800280 (405628x114), 7800281 (405628x51), 7800295 (405012x108), 7800297 (405012x108), 7800300 (405606x78C), 7800320 (405021x151)
- Compatible with Lawn Tractor Models: 7800321 (405628x151), 7800282 (425307x51A), 7800302 (425017x78B), 7800303 (425621x108C), 7800304 (425622x78C), 312006x50C, 385002x108B, 385003x108, 385047x51A, 405013x50C, 405020x51A, 405606x50C, 405612x108, 405627x51A, 425621x108B 42", 425622x50C 42", 312006x50B-SW 30", 312006x78B 30", 385002x50B-SW 38", 385002x78C 38", 385044x51A-SW 38", 405013x50B-SW 40", 405606x50B-SW 40", 405606x78B 40", 405607x78A 40", 405625x51A-SW 40", 425622x50B-SW 42", 425622x78B 42", 425640x50B-SW 42", 312002x11B 30", 312006x50A 30", 385000x68B 38", 385001x51A 38", 385002x108A 38", 385002x50A 38", 385002x78A 38", 385002x78B 38"
- Compatible with Lawn Tractor Models: 385000x68A 38", 385014x98B 38", 385015x50B 38", 385015x50C 38", 385016x78A 38", 385021x53A 38", 405000x31B 40", 405000x8C 40", 405000x8D 40", 405004x50B 40", 405004x52A 40", 405005x99B 40", 405005x99C 40", 405007x18B 40", 405012x78A 40", 405030x48B 40", 405030x48C 40", 405602x51A 40", 405604x53A 40", 312000x68B 31", 312000x98B 31", 312002x98A 31", 312003x50A 31", 385008x51B 38", 385008x52B 38", 385009x98B 38", 385012x68B 38", 385013x51A 38", 385014x98A 38", 385015x50A 38", 385300x30A 38"
- Replace Part Number: Gas cap with gauge replace part number 152334 161493 532152334 532161493. Note: Please check if the size in the picture is what you need
- Fitment: Fuel cap with gauge fit for Craftsman Husqvarna Mower Tractor. Note: Please check if the size in the picture is what you need
- Function 1: The fuel tank cap can prevent fuel leakage and impurities from entering, thereby protecting precision components such as the fuel pump and fuel injector from damage. It has a certain degree of flame retardancy, reducing the risk of fuel being ignited
- Function 2: The gas tank cap is equipped with an fuel level indicator, which is convenient for users to check the remaining fuel quantity
- When to Replace: Seal failure, abnormal oil level indication, cracking and deformation
Choosing the Right Gas for Your Lawn Mower: A Complete Buying Guide
Your lawn mower needs the right fuel to run well. Using the wrong gas can hurt your engine over time. This guide helps you pick the best gasoline for your machine, keeping your lawn looking great all season.
Key Features to Look For in Lawn Mower Gas
When you buy gas, a few things really matter. Think about these features to make the best choice.
1. Octane Rating
Octane tells you how much the fuel resists knocking or pinging in the engine. Most modern lawn mowers use regular unleaded gasoline. Check your owner’s manual, but usually, an 87 octane rating is perfect.
2. Ethanol Content
Ethanol is an alcohol mixed with gasoline. Too much ethanol can damage rubber parts and fuel lines in older mowers. Look for gas with lower ethanol, like E10 (10% ethanol) or non-ethanol fuel if your mower is older or you store it for long periods.
3. Fuel Stabilizers
If you don’t use your mower often, the gas can go bad. Stabilizers keep the fuel fresh longer. Some gas stations sell stabilized fuel, or you can buy a separate stabilizer product to mix in.
Important Materials and What They Mean
The basic material is gasoline, but additives change how it works.
- Pure Gasoline: This is the base fuel. It burns cleanly when fresh.
- Ethanol: This additive helps the fuel burn cleaner but it attracts water. Water mixed with ethanol separates and sinks, causing big problems for your carburetor.
- Detergents: Good quality gasoline often includes detergents. These cleaning agents help keep the engine parts clean as the fuel burns.
Factors That Improve or Reduce Quality
The quality of the gas directly impacts how long your mower lasts and how easily it starts.
Factors That Improve Quality:
- Freshness: Always buy gas that was recently pumped. Fresh fuel starts the engine easily.
- Top Tier Rating: Some gas brands meet higher standards for cleanliness. These fuels often contain better cleaning packages.
- No Ethanol: For storage or older engines, gas without ethanol is always better quality fuel.
Factors That Reduce Quality:
- Old Gas: Gas left in the tank over winter turns gummy. This sticky residue clogs small fuel passages.
- High Ethanol (E15 or E85): These blends can severely damage small engine components not designed to handle high alcohol content.
- Water Contamination: If the gas station tank has water, your mower will suffer poor performance or fail to run.
User Experience and Use Cases
What you use the gas for changes what you should buy.
For Daily or Weekly Use:
If you mow every week during the summer, standard 87 octane E10 gasoline from a busy gas station is usually fine. The fuel turns over quickly, so it stays fresh.
For Long-Term Storage (Winterizing):
If your mower sits for more than 30 days, you must protect the fuel. You should either:
- Run the mower completely dry before storing it.
- Fill the tank completely and add a high-quality fuel stabilizer. This prevents air from getting in and slows down the fuel breakdown process.
For High-Performance or Commercial Mowers:
Some high-powered engines might suggest a higher octane (like 89 or 91). Always follow the manufacturer’s recommendation. Commercial users often prefer buying fuel in sealed cans to ensure purity.
10 Frequently Asked Questions (FAQ) About Lawn Mower Gas
Q: What octane rating should I use in my push mower?
A: Most push mowers need 87 octane regular unleaded gasoline. Always check your manual first.
Q: Can I use E15 gas in my lawn mower?
A: Generally, no. E15 gas is not safe for most small engines. It can damage seals and hoses.
Q: What is the biggest problem with old gas in a mower?
A: Old gas leaves behind varnish and gum. This sticky residue clogs the carburetor, which stops the engine from starting or running smoothly.
Q: Should I use premium gas (91 octane or higher)?
A: No, premium gas does not help standard lawn mower engines. They are not built to need that high of an octane rating.
Q: How long does regular gasoline last in a mower tank?
A: Untreated gasoline starts to degrade in about 30 days. With a good stabilizer, it can last up to a year.
Q: What should I do if I accidentally put diesel fuel in my gas mower?
A: Do not start the engine! Siphon out all the diesel fuel immediately. Then, add fresh gasoline and try to run the engine briefly to clear the lines.
Q: Is non-ethanol gas worth the extra cost?
A: If you have an older mower or plan to store the mower for several months, non-ethanol gas is often worth the cost to prevent ethanol-related damage.
Q: Do I need to add oil to my lawn mower gas?
A: Only if you have a two-stroke engine (like some string trimmers or older leaf blowers). Most modern four-stroke lawn mowers use regular unleaded gas and have a separate oil dipstick for lubrication.
Q: How can I tell if the gas I bought is fresh?
A: Fresh gas smells strong and clean. If it smells sour, varnish-like, or weak, it is old and should not be used.
Q: Can I use gas left over from my car in my mower?
A: Yes, if it is fresh and has the correct octane. However, car gas often contains ethanol, so be mindful of how long it sits in the mower tank.