Generac

Generac 8917 GP18000EFI 18,000-Watt Gas-Powered Electric-Start Portable Generator

|1,729 ratings
Current price is $4,399.00
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Highlights

  • COsense® Technology for powerful protection against hazardous carbon monoxide
  • Generac 816cc EFI Engine delivers the right amount of power for performance and efficiency
  • TruePower™ Technology safely powers sensitive electronics and tools
  • Low-oil pressure shutdown automatically safeguards engine from damage
  • Large capacity fuel tank provides durability and extended run times
  • CARB compliant
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Generac 8917 GP18000EFI 18,000-Watt Gas-Powered Electric-Start Portable Generator
Generac 8917 GP18000EFI 18,000-Watt Gas-Powered Electric-Start Portable Generator
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About this item

Product details

From emergency home backup to DIY projects to the jobsite, the Generac 8917 GP18000EFI portable generator provides high wattage, dependable portable power. The 18,000 running watts and 22,500 starting watts allow for ultimate flexibility of use. Equipped with an 816cc engine with Electronic Fuel Injection, the GP18000EFI delivers power efficiently, providing up to 9 hours of runtime at 50% load due to the 13.8 gallon fuel tank. TruePower™ Technology enables you to safely powers sensitive electronics, appliances, and tools with less than 5% total harmonic distortion (THD). The onboard COsense® Technology provides powerful protection against hazardous carbon monoxide. 

The GP18000EFI also features electric start (battery included), low-oil shutdown protection, circuit breaker protected outlets, and an hour meter with maintenance resets. The included never-flat wheel kit and available lifting eye accessory make transportation easy around the home or jobsite. The GP18000EFI is manual transfer switch compatible. When paired with a manual transfer switch, the GP18000EFI is powerful enough to provide whole home backup and is a great alternative to a Home Standby generator. The hardened 1.25” steel tube cradle provides added strength and durability. 

This unit includes (1) 120/240V AC 50A receptacle (NEMA 14-50R), (2) 120V 20A 50-20R duplex outlets, (1) 120/240V AC, 30A locking receptacle (NEMA L14-30R), and (1) 120V AC, 30A locking receptacle (NEMA L5-30R). All of this backed by a three year limited warranty and Generac’s USA based 24/7/365 customer service.

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Warnings and disclaimers

Ingestion Hazard

This product contains a battery. Death or serious injury can occur if ingested. A swallowed battery can cause Internal Chemical Burn in as little as 2 hours. Keep new and used batteries OUT OF REACH OF CHILDREN. Seek Immediate medical attention if a battery is suspected to be swallowed or inserted inside any part of the body.

Member ratings & reviews

4.6 out of 5 stars
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1,729 ratings1,729 reviews
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  1. 5 stars78% (1,354)
  2. 4 stars15% (253)
  3. 3 stars2% (41)
  4. 2 stars1% (20)
  5. 1 star4% (61)
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Showing 1-3 of 1,729 reviews

Oct 1, 2026
Reviewer name: JAH15
5 out of 5 stars
5 out of 5 stars review

Pleased with our purchase

We lost power due to severe storms that roared through our area. The sump pump was flooding out into the basement and we had just filled our freezer so we needed electricity. Because of the widespread damage from the storms it was evident we were not getting our power on anytime soon. Purchased a Generac 8000 watt unit and we were able to get through the blackout! The generator supplied more than enough power and ran several hours on a tank of gas - very pleased with our purchase!

Review from generac.com
Helpful?698EZRGTDSV513631905214
Oct 1, 2026
Reviewer name: Jank
5 out of 5 stars
5 out of 5 stars review

Power to spare

I bought this during the power outage of August. Setup was easy, the generator worked flawlessly. It powered half of my house with extension cords. 2 refrigerators, a chest freezer, sump pump, ceiling fans and lights. Had my cable modem and wifi running as well as 2 8,000 BTU air conditioners. The only issue I ran into was that the cushions for the handlebars were missing. All it took was a few emails and Generac took care of that for me.

Review from generac.com
Helpful?698EZRGTDSV513631905214
Sep 1, 2026
Reviewer name: Gristmill
5 out of 5 stars
5 out of 5 stars review

Easy to use

I bought the 8063 tri fuel generator at a local hardware store, I local electrician installed a transfer switch. Approximately a week later we had a power outage. The generator worked as expected it did seem to be a little hard to start i was using propane, but that may be normal I don't have experience with using propane for fuel.

Review from generac.com
Helpful?698EZRGTDSV513631905214