Generac GP18000EFI Portable Generator — Massive 18,000W Power With Smart EFI Efficiency And COsense® Safety
When your home, jobsite, or business can’t afford to go dark, trust the Generac GP18000EFI Generator — one of the most powerful portable generators on the market.
Built for heavy-duty use and all-day reliability, it delivers 18,000 starting watts and 9 hours of runtime at 50% load, powered by Generac’s 816cc Electronic Fuel Injection (EFI) engine for instant starts, improved fuel efficiency, and fewer maintenance issues.
Unlike ordinary generators, the GP18000EFI combines industrial-grade muscle with intelligent protection. Generac’s exclusive COsense® Technology automatically shuts down the unit if dangerous carbon monoxide levels are detected — keeping you and your crew safe.
Whether you’re backing up your home during an outage, running a remote construction site, or powering tools for big DIY projects, this generator gives you TruePower™ clean energy for sensitive electronics, an electric start for effortless operation, and never-flat wheels for smooth mobility wherever the job takes you.
Power Through Anything — Efficiently, Safely, and Reliably, With The Generac GP18000EFI Portable Generator
Unmatched Output To Power Through Any Job
18,000 starting watts and 14,000 running watts handle everything from HVAC systems to power tools.
Smart EFI Engine To Ensure Fast Starts In Any Weather
Electronic Fuel Injection improves performance, reduces fuel waste, and ensures fast starts in any weather.
Built-In COsense® Protection To Stop Carbon Monoxide Before It Becomes Dangerous
Detects and stops carbon monoxide before it becomes dangerous.
TruePower™ Clean Energy To Safely Power Modern Home Appliances
<5% THD safely runs laptops, refrigerators, and modern electronics.
Extended Runtime
14.2-gallon steel tank provides up to 9 hours of continuous power at 50% load.
Rugged Steel Frame For Rugged Outdoor Use
1¼" hardened steel tube cradle built to withstand jobsite abuse.
Electric Start (Battery Included)
Turn the key and go — no manual pulling required.
Low-Oil Shutdown Protection To Protect Your Engine From Damage
Safeguards your engine from damage automatically.
Easy to Move (even for a big boy generator)
Heavy-duty, never-flat wheels and optional lifting eye make transport simple.
Generac GP18000EFI Portable Generator Warranty
Generac provides a 3-year warranty policy, ensuring the absence of defects in materials, workmanship, and performance during the warranty period.
What's Included
- 1 x Generac GP18000EFI Gasoline 18000W/22500W Portable Generator
- 1 x Battery (for electric start)
- 1 x Never-Flat Wheel Kit
- 1 x Folding Handles
- 1 x Manual
Generac GP18000EFI Portable Generator Specifications
|
| Product Series |
GP18000EFI |
| Model (Configuration) |
8917-0 (50-State) |
| CARB Approved |
Yes |
| AC Rated Output Running Watts |
18000 |
| AC Maximum Output Motor Starting Watts |
22500 |
| Rated AC Voltage |
120/240 VAC |
| Rated AC Frequency |
60 Hz |
| Rated VAC Amperage |
75 /150 |
| Engine Displacement |
816cc |
| Engine Type |
OHVI |
| Engine RPM |
3600 |
| Recommended Oil |
10W-30 / SAE30 |
| Oil Capacity qt (L) |
w/ Filter Change: 2.2 (2.1), w/o Filter Change: 2.0 (1.95) |
| Lubrication Method |
Oil Pump |
| Starting Method |
Electric |
| Low Oil Shutdown Method |
Low Pressure |
| Battery Included |
Yes |
| Battery Type |
Group U1 |
| Battery Part No. |
N/A (purchase locally) |
| Battery Dimensions |
Group U1 Standard Case Size |
| Neutral Bonded to Ground |
Yes – Bonded to Frame |
| Start Switch Type |
Off / Run / Start Switch |
| Switch Location |
On Control Panel |
| Fuel Gauge |
Yes |
| Fuel Tank Capacity (gal / L) |
14.2 gal / 54.0 L |
| Run Time at 50% Load (hrs) |
11 |
| Handle Style |
Folding, Locking |
| Wheel Type |
12″ Never-flat Wheels |
| Warranty - Residential |
3 Year Limited |
| Warranty - Commercial |
2 Year Limited |
Dimensions and Weights
|
| Length in (mm) |
58.5 (1485) |
| Width in (mm) |
30.9 (785.5) |
| Height in (mm) |
36.5 (928.1) |
| Carton Length in (mm) |
40 (1016) |
| Carton Width in (mm) |
27 (685.8) |
| Carton Height in (mm) |
37.7 (958.2) |
| Unit Weight lbs (kg) |
439.2 (199.2) (EPA/49-State) / 442.8 (200.9) (50-State) |
| Shipping Weight lbs (kg) |
469.2 (212.8) (EPA/49-State) / 472.8 (214.5) (50-State) |
Generac GP18000EFI Portable Generator Manual
