Generator Fuel Types: Gas, Propane, Diesel, or Dual?

Reading the fuel word in a title

A generator listing announces the fuel in the first words of the title. 'Gasoline' means the engine takes gasoline only. 'Dual fuel' means the same unit runs on gasoline or propane, and 'tri fuel' means the engine name lists gasoline, propane and natural gas together. A title that names no fuel is usually a gasoline set, and the maker's page states the fuel.

The fuel word sits next to the type word (inverter, portable, standby) and the first watts figure. Read them together: dual fuel and tri fuel words appear mostly on portable sets, while standby listings often name natural gas or propane as the fuel.

A title that reads 'Home Backup' is the seller's words for how the set is used, not a fuel name. The fuel word is separate, and a home backup label can appear on a gasoline, dual fuel or tri fuel listing.

Gasoline: the fuel most portable listings name

Gasoline is a petroleum product made from crude oil, and it is sold at gasoline fueling stations, according to the U.S. Energy Information Administration. On this site, most portable and inverter listings are gasoline sets.

A gasoline listing names one fuel. The best gas generators guide groups these sets, and the title's two watts figures tell you what the maker states the set can produce. Runtime and fuel use per hour are on the maker's page, not in the title. A gasoline set is the simplest title to read: one fuel, one set of watts figures.

The best portable generator guide also covers gasoline sets alongside other types, since fuel is one word in a longer title.

Propane and the dual fuel listing

Propane is a hydrocarbon gas liquid, a class of hydrocarbons that occur as gases at atmospheric pressure, as the EIA explains. On a listing, 'dual fuel' means the same unit runs on gasoline or propane. The best dual fuel generator guide and the best dual fuel portable generator guide cover these sets.

Shop for a dual fuel listing when you want a second fuel option in an area where propane is available. Availability is a question for your supplier: who refills tanks nearby and what sizes they can fill. The owner's manual describes the switch between fuels, and the switch is a feature the maker describes in that manual.

A dual fuel unit keeps one set of watts figures in its title; the maker's page may state output per fuel, and the reader should read that page for the per fuel figures.

Natural gas and the tri fuel listing

Natural gas is a fossil fuel energy source whose largest component is methane, according to the EIA. A 'tri fuel' listing names gasoline, propane and natural gas as the three fuels the same engine can take. The best tri fuel generator guide groups these sets.

Natural gas is delivered to homes through a utility's pipelines, according to the EIA. Whether natural gas service is available at your address is a question for the utility. The maker's manual states what the generator requires.

A tri fuel listing is the widest fuel word you will read on this site; it names all three fuels in one title, and the main generator guide shows how tri fuel sets sit beside dual fuel and gasoline sets.

Diesel as a listing word

Some listings name diesel as the fuel. The guides on this site mostly cover gasoline, dual fuel and tri fuel portable sets, so diesel units appear rarely in the catalogue. A diesel listing still carries the same readable words: type, watts, start method and fuel.

For a diesel set, read the maker's page for the fuel details. This site does not rank diesel units in its guides, and the article on diesel versus gasoline compares the two fuels as listing words.

Fuel availability as a shopping question

The fuel word in a title is only part of the choice. The real question is what is convenient to buy where you live. For gasoline, a nearby fueling station answers that. For propane, ask the supplier that refills tanks in your area. For natural gas, the utility that serves your home answers whether the fuel is available.

Ask whether a supplier can deliver to a campsite or a cabin before you plan around propane; the supplier answers that, not this site. Related Learn articles explain generator fuel type availability and the single fuel versus dual fuel comparison.

The EIA pages explain what each fuel is, not what a particular generator does with it. This site states no runtimes and no fuel use per hour; those figures come from the maker's page and the owner's manual.

Storage and runtime on the maker's page

Storage and runtime are not stated in the listing title on this site. The maker's page and the owner's manual state runtime at a given load and describe how the generator is stored between uses. This article gives no figures and no storage steps.

When you compare listings, read the maker's page next to the title. The watts figures in the title are the maker's stated numbers; the manual answers fuel, runtime and care questions in the maker's own words.

General generator guidance appears on the CPSC's generator page and the CDC's carbon monoxide page, and those pages and the maker's manual answer the rest.

What to pick for your situation

Questions

Is a dual fuel generator more useful than a single fuel one?

Dual fuel adds propane as a second option. Which is more useful depends on what fuel is convenient to buy where you live. A gasoline-only set is simple; a dual fuel set gives you a choice at a campsite or before a storm.

Does the fuel word in a title affect the wattage figures?

No. The watts figures are stated separately in the title. The fuel word tells you what the engine takes, and the maker's page states output and runtime for each fuel.

Can a gasoline listing run on propane?

Only if the title says dual fuel or tri fuel. A gasoline-only listing is for gasoline, and the maker's manual states what the engine accepts.

Where is runtime stated for a fuel type?

The maker's page and the owner's manual state runtime at a given load. This site does not state runtime figures.

Does this site compare diesel generators?

The guides mostly cover gasoline, dual fuel and tri fuel portable sets. Diesel listings appear rarely in the catalogue, and a diesel unit is read the same way: type, watts, start and fuel on the listing, with the maker's page for details.