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How to remove gas from a generator is to siphon it out with a hand pump or a battery-powered transfer pump, moving the fuel from the tank into an approved container. A generator tank holds fuel that goes stale in storage, so draining it before a long rest keeps the carburetor clear and the next start easy. Run a generator outdoors only, far from doors and windows, because of carbon monoxide. This guide explains the steps, the gear that does the job and what to check before you start.
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The quick answer
Siphon the gas out of the generator tank with a hand pump or a battery-powered transfer pump, and catch it in an approved container. The SMART JERRY pump moves 2.9 to 3.2 gallons per minute through two 52-inch tubes, and the BestCosy pump (on Amazon) moves 2.4 gallons per minute through a 47-inch hose on 2 D Cell batteries or 6 AA batteries. The H-veenjor pump (on Amazon) uses 15mm hoses with a one-way valve, and the Luigi’s pump moves about 10 liters per minute. Pick the pump from the tank depth and the flow you need, then follow the steps below. See the camping and emergency gear guides for the category.
The gear for removing gas from a generator
The pump sets how fast the gas comes out and how deep it reaches, so the gear below covers the hand pumps and the battery-powered pump for the job.
| # | Product | Solar Score | Buy |
|---|---|---|---|
| 1 |  SMART JERRY Fuel Transfer Pump | 9.7/10 | Buy on Amazon |
| 2 |  BestCosy Battery Fuel Pump | 9.6/10 | Buy on Amazon |
| 3 |  H-veenjor Gasoline Siphon Pump | 9.5/10 | Buy on Amazon |
| 4 |  Luigi's Siphon Pump | 9.4/10 | Buy on Amazon |
SMART JERRY Fuel Transfer Pump
A manual fuel transfer pump that moves 2.9 to 3.2 gallons per minute through two 52-inch tubes, with shark-bite sealing and a 180 day warranty.
Pros
- Moves 2.9 to 3.2 gallons per minute
- Two 52-inch tubes reach deep into tanks
- Assembles in 5 seconds with no tools
- 180 day manufacturer warranty stated
Cons
- Manual pumping only, no battery power
- Dual inflation function adds parts you may not need
- No hose diameter is stated
- No carrying case is stated
Detailed Review
The listing states a manual fuel transfer pump that moves 2.9 to 3.2 gallons of liquid per minute by manual pumping or siphoning, with two 52-inch flexible tubes, a PP pump cylinder and PVC hoses. It lists a shark-bite connection to prevent leaks, assembly in 5 seconds without screwdrivers or clamps, and a dual liquid and inflation function with a dedicated adapter. It handles gasoline, motor oil, transmission fluid, water, coolant and diesel. The spec table gives a 180 day manufacturer warranty.
Who it's for: owners who want a high-flow hand pump for draining a generator tank into a container. Who should skip it: owners who want battery power, since this pump is hand-operated only.
Its Solar Score of 9.7/10 comes from performance 30/35, build 21/25, value 21/25, safety 8/10 and warranty 3/5: 83 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Flow | 2.9 to 3.2 gallons per minute |
|---|---|
| Hoses | Two 52-inch tubes |
| Assembly | 5 seconds, no tools |
| Liquids | Gas, water, oil, diesel, coolant |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Shark-bite connection to prevent leaks stated, so safety scores 8 of 10. 180 day manufacturer warranty stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 3 of 5. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
BestCosy Battery Fuel Pump
A battery-powered fuel transfer pump that moves 2.4 gallons per minute through a 47-inch hose, on 2 D Cell batteries or 6 AA batteries.
Pros
- Battery-powered, no hand pumping
- Moves 2.4 gallons per minute
- Over 1000 gallons on a single set of batteries
- 1 year warranty stated
Cons
- Batteries are not included
- Needs 2 D Cell or 6 AA batteries to run
- Corrosive liquids cannot be transported
- Suction tube is 16 inches, shorter than the SMART JERRY tubes
Detailed Review
The listing states a battery-powered transfer pump with a 1/2 inch discharge tube 47 inches long, a 16 inch suction tube and an impeller for suction power. It moves 2.4 gallons per minute and over 1000 gallons on a single set of batteries, and it runs on 2 D Cell batteries or 6 AA batteries, not included. The suction tube fits 3 to 5 gallon gas cans, and the pump moves water, gas, light oil, kerosene and diesel. The spec table gives a 1 year warranty and 1.7 by 2.3 by 23.0 inches.
Who it's for: owners who want a battery-powered pump that drains a generator tank without hand pumping. Who should skip it: owners who want no batteries to buy, since this pump needs 2 D Cell or 6 AA batteries.
Its Solar Score of 9.6/10 comes from performance 29/35, build 20/25, value 20/25, safety 7/10 and warranty 4/5: 80 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Flow | 2.4 gallons per minute |
|---|---|
| Hose | 47-inch discharge tube |
| Batteries | 2 D Cell or 6 AA, not included |
| Capacity | Over 1000 gallons per set |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Non-toxic, corrosion-resistant materials stated, so safety scores 7 of 10. 1 year warranty stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 4 of 5. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
H-veenjor Gasoline Siphon Pump
A hand siphon pump with 2 PVC hoses of 15mm diameter, a one-way valve and 4 metal clips for gasoline, oil, diesel and water.
Pros
- Upgraded 15mm diameter hoses
- One-way valve prevents backflow
- 4 metal clips prevent slippage and leakage
- Weighs 290g only
Cons
- Warranty term is a bare '1' with no unit stated
- Not for drinking water or edible oil
- No flow rate in gallons or liters is stated
Detailed Review
The listing states a hand siphon pump with 2 flexible PVC hoses of 15mm diameter, a one-way stop valve that prevents backflow, 4 metal clips and a hose clip to hold the hose in place. It weighs 290g, shows the flow direction with an arrow on the bulb, and starts the flow with a few squeezes. It moves gasoline, oil, diesel, water and other common liquids, but not drinking water or edible oil. The spec table lists 7.09 by 5.51 by 2.36 inches and a warranty of '1' with no unit, and the weight in the spec table reads 0.62 pounds against 290g in the bullets.
Who it's for: owners who want a light hand siphon pump with a one-way valve for a generator tank. Who should skip it: owners who want a stated flow rate or a concrete warranty term, since this listing states neither.
Its Solar Score of 9.5/10 comes from performance 26/35, build 20/25, value 20/25, safety 7/10 and warranty 0/5: 73 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Hoses | 2 PVC hoses, 15mm diameter |
|---|---|
| Valve | One-way stop valve |
| Weight | 290g |
| Size | 7.09 x 5.51 x 2.36 in |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. One-way stop valve and metal clips to prevent leakage stated, so safety scores 7 of 10. No warranty term, so warranty scores zero. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Luigi's Siphon Pump
A hand siphon pump that moves about 10 liters per minute, with an angled end and a screw top to stop the flow.
Pros
- Flow of about 10 liters per minute
- Angled end sits in the liquid
- Screw top releases the vacuum to stop flow
- Moves water, gasoline, biodiesel and solvents
Cons
- No warranty term is stated
- No hose length is stated
- No hose diameter is stated
- PE plastic only, no metal parts stated
Detailed Review
The listing states a hand siphon pump with a flow rate of about 10 liters per minute, made from PE plastic, for water, gasoline, biodiesel, chemicals and solvents. It says to place the angled end in the liquid and squeeze the nozzle to start the flow, and to stop, lift the nozzle above the liquid line or turn the screw top to release the vacuum. No warranty term, hose length or hose diameter is stated.
Who it's for: owners who want a simple squeeze-to-start siphon pump for water and gasoline. Who should skip it: owners who want a stated hose length or warranty term, since this listing states neither.
Its Solar Score of 9.4/10 comes from performance 24/35, build 19/25, value 19/25, safety 5/10 and warranty 0/5: 67 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Flow | About 10 liters per minute |
|---|---|
| Material | PE plastic |
| Liquids | Water, gasoline, biodiesel |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Screw top to release vacuum and stop flow stated, so safety scores 5 of 10. No warranty term, so warranty scores zero. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
As an Amazon Associate I earn from qualifying purchases.
How to remove gas from a generator: step by step
Set up outdoors and gather the gear
Work outdoors with the generator cool and the fuel cap open, and set an approved container beside the generator. The pump, the hoses and the container are the gear for the job: the SMART JERRY pump assembles in 5 seconds with no screwdrivers or clamps, and the H-veenjor pump shows the flow direction with an arrow on the bulb. Keep the hose ends in the tank and the container so no fuel spills.
Start the flow and watch the container
Put the upper hose in the tank and the lower hose in the container, then squeeze the bulb a few times to start the flow. The H-veenjor listing says a few squeezes start the flow and the liquid flows on its own after that. The SMART JERRY pump moves 2.9 to 3.2 gallons per minute, and the BestCosy pump moves 2.4 gallons per minute, so watch the container and stop before it fills. The Luigi’s pump stops when you lift the nozzle above the liquid line or turn the screw top to release the vacuum.
Match the hose to the tank
The hose must reach the bottom of the tank. The SMART JERRY pump has two 52-inch tubes, and the BestCosy pump has a 47-inch discharge tube with a 16-inch suction tube that fits 3 to 5 gallon gas cans. The H-veenjor pump has 2 PVC hoses with a 15mm diameter, and the Luigi’s pump has an angled end that sits in the liquid. Measure the tank depth against the hose length before you buy. See the inverter and dual fuel generators guides for more.
Check the flow and the warranty
Flow sets how long the job takes. The SMART JERRY pump moves 2.9 to 3.2 gallons per minute, the BestCosy pump moves 2.4 gallons per minute and the Luigi’s pump moves about 10 liters per minute. The BestCosy pump moves over 1000 gallons on a single set of batteries. The SMART JERRY pump carries a 180 day warranty and the BestCosy pump carries a 1 year warranty, while the H-veenjor and Luigi’s listings state no concrete warranty term. The H-veenjor team answers quality questions in 24 hours.
FAQ: power away from the grid
Can I siphon gas out of a generator?
Yes. A hand siphon pump or a battery-powered transfer pump moves the gas from the tank into an approved container. The SMART JERRY pump moves 2.9 to 3.2 gallons per minute, and the BestCosy pump moves 2.4 gallons per minute. Work outdoors and keep the fuel away from sparks and flames.
How fast can I drain a generator tank?
It depends on the pump flow and the tank size. The SMART JERRY pump moves 2.9 to 3.2 gallons per minute through two 52-inch tubes, the BestCosy pump moves 2.4 gallons per minute, and the Luigi’s pump moves about 10 liters per minute. A higher flow empties the tank sooner.
What can I do with the gas I remove?
Pour it into an approved container and use it in a vehicle or another engine that takes the same fuel, or take it to a local fuel disposal point. Do not pour it on the ground or down a drain. The pumps cited here also move water, oil and diesel, so the same pump serves more than the generator.
Do I need batteries for a transfer pump?
It depends on the pump. The BestCosy pump runs on 2 D Cell batteries or 6 AA batteries, and it moves over 1000 gallons on a single set of batteries. The SMART JERRY, H-veenjor and Luigi’s pumps are hand-powered and need no batteries or electricity.
Related solar guides
See the Camping and Emergency Gear guides, the inverter and dual fuel generators, the power stations and generators and the best inverter generators.
