Predator 4375 - 3500/4375W Portable Generator

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Predator 4375Predator 4375Predator 4375
Even though the pictures on this product page show wheels, Predator generators sold at Harbor Freight do not come with a wheel kit. It must be purchased separately.
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Price History
Price history for the Predator 4375
Latest updates:
  • $479.99 - April 17, 2024
  • $379.99 - April 13, 2024
  • $479.99 - February 3, 2024
Data source:
Since: February 3, 2024
  • Highest Price: $479.99 - February 3, 2024
  • Lowest Price: $379.99 - April 13, 2024


Powered by a dependable 212cc PREDATOR® gas engine, this generator is compact, lightweight, and provides power wherever it's needed.

Zoom on the Predator 4375

To sum up, the Predator 4375 is a compact portable generator tailored for:

  • RV travellers who wish to upgrade their experience to another level
  • People occasionally participating in sporting competitions, open-air performances and outdoor festivals
  • Handcrafting enthusiasts who wish to work on-the-go
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Professionals in need of safely powering high-intensity work or lighting equipment

In the upcoming sections, you'll discover its power characteristics, the array of outlets it presents, its overall portability, and the additional features it possesses.

Power & Run Time

The Predator 4375 in use

The Predator 4375

Predator 4375 runs on gasoline, powered by a 212 cc (6.5 hp) OHV 4-stroke engine, delivering 120/240V, boasting a running wattage of 3,500W alongside a starting wattage of 4,375W.

Operating at a noise rating of 72 dBA (just slightly more noisy than a shower), this generator starts up with a manual recoil starter system.

The 4375's fuel tank, boasting 4.8 gallons, allows it to operate for around 16 hours at 50% load with a full tank (with an estimated fuel consumption of 0.3 GPH).


The control panel features 5 AC outlets as follows:

Two Duplexes 120V 20A (5-20R) GFCI
120/240V 30A (L14-30R) receptacle

Additionally, it offers 1 DC outlet: there's a 12V 8A (cigarette lighter style) receptacle with which charging your batteries is made easy.

As it features a twist-lock L14-30R receptacle, the 4375 is transfer switch ready: in case of a power outage, you will be easily able to connect it to a breaker box and power your household.


Measuring L23.3 x W18.7 x H19.3 in, the classic open frame build of the Predator 4375 delivers stability and easy maintenance access to components, facilitating air circulation. The featured design is ideal for the outdoors and all tough environments.

Despite its weight of 105 lbs, the generator is still considered 'portable,' meaning it is movable, although its heftiness may restrict portability in certain environments or require additional considerations for transportation and setup. However, its challenging mobility is solved by a wheel kit (separate purchase), which will ease its displacement, once it is on the floor.


Panel of the Predator 4375

The 4375's control panel

A light indicator allows you to instantly see if the oil level is too low.

The inclusion of a built-in fuel gauge in the generator streamlines gas level checks for quick and convenient assessments.

From a security standpoint, the generator is furnished with an automatic low oil shut-off and an overload protection (circuit breaker), ensuring peace of mind during operation.

The unit also benefits from the Predator's CO SECURE™ carbon monoxide detection. This system monitors the accumulation of CO gas while the generator is running and will shut off the engine if the levels become dangerously high.

Besides the usual set of documentation and owner's manual (opens in a new tab) to get you promptly started, Predator also included a tool kit in the 4375's packaging.

Product Video

The Predator 4375 versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Predator 4375 compare to generators of similar power (between 3000 and 4000 W).

  • Having a dry weight of 105 lbs, the Predator 4375 belongs in the expected weight range for generators which produce 3000 to 4000 rated watts. Weight-conscious users may find the Pulsar PGD40iSCO appealing, as it is one of the top contenders in this power range, weighing just 46 pounds.
  • When compared to other units producing a similar running wattage, this generator and its lowest emitted noise of 72 dBA stand out for being on the louder side. If noise emissions are important to you, one of the least noisy generators of this power range is the Westinghouse iGen4500DF with only 52 dBA.
  • Thanks to an impressive running time of around 16 hours at 50% load, the 4375 benefits from one of the highest run times among generators of a similar output.
  • While run time is vital, it hinges on the fuel capacity. To grasp the full picture, we must also factor in fuel efficiency. This generator can be considered as fuel-efficient, due to its low estimated fuel consumption of only 0.3 GPH (gallon per hour) at 50% load, within the aforementioned wattage range. If you wish to further improve in the area of fuel efficiency, the Pulsar PGD40iSCO, which boasts with a gas consumption of only 0.22 GPH, may be the right generator for you.

Price comparison

As you can see from these interactive charts, when compared to other 3000-4000W generators, the Predator 4375 is on the cheap side of the price range.

It can therefore be a really good buy if you're looking to acquire a budget generator.

The bottom line

  • Inexpensive
  • CO SECURE™ technology
  • GFCI Outlets
  • High run time
  • Fuel efficient
  • Decent weight (105 lbs)
  • No data center
  • No electric start
  • Wheel kit not included
  • Weak warranty
  • On the noisy side (72 dBA)

Do you own the Predator 4375 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

Parallel capableNo
RV readyNo
Engine212 cc OHV 4-stroke
Starting systemRecoil
Warranty90 days
VoltageAC: 120/240V 60 Hz, DC: 12V
Running watts3,500 W
Starting watts4,375 W
Running amps (@120/240V)29.2/14.6 amps
Peak amps (@120/240V)36.5/18.2 amps
Run time @50% load16 h
Run time @25% loadUnknown
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 2x Duplex 120V 20A (5-20R) GFCI
  • 1x 120/240V 30A (L14-30R)
DC outlets1x 12V 8A (cigarette lighter style)
Data centerNo
IndicatorsLow oil
Fuel tank4.8 gal
Fuel gaugeYes
Weight105 lbs
Approx. dimensions (L x W x H)23.3 x 18.7 x 19.3 in
Noise (lower limit)72 dBA
ComplianceCARB, EPA, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralBonded to frame
Accessories includedTool kit
Other model numbers59132

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

Spec Improvement×

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About Predator

Predator portable generators are solely distributed by the Harbor Freight Corporation, which has an impressive list of over 200 trademarked products. The Predator brand is one of their newer lines of outdoor power products. As with many other makes and models of power equipment sold by Harbor Freight, Predator generators are manufactured in China.

Warranty Information

The Predator 4375 is covered under a warranty for up to 90 days. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Predator generators, please consult Harbor Freight's warranty policies stated in the user manual (opens in a new tab). Alternatively, you can also contact their Customer Support : 1-800-444-3353.

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizer.
ItemRunning WattsStarting Watts
At homeAC (10,000 BTU)15002200
Sump pump (1/2 hp)10502150
Refrigerator (energy star)1921192
Set of 5 LED light bulbs5555
Total2797 W3897 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Microwave (1000 watts)15001500
Total2790 W3380 W
For workGrinder14002500
Demolition hammer12601260
Bug zapper8080
Total2740 W3840 W
Does this generator have an inverter? (Asked June 10, 2020)

This unit is not an inverter generator.

how do i change the oil (Asked August 21, 2020)

Oil change procedure is detailed page 18 of the owner's manual (opens in a new tab).

What spark should I use and what is the gap setting (Asked August 23, 2020)

Spark plug type is NHSP/Torch F6TC. Gap setting is 0.027" – 0.031".

What kind of oil (Asked August 28, 2020)

Recommended engine oil is SAE 10W – 30 above 32° F, and SAE 5W – 30 at 32° F or below

What grade of gas? (Asked September 08, 2020)

Recommended gas is 87 octane or higher unleaded gasoline that has been treated with a fuel stabilizer additive.

Do you have to ground this generator predator 4375 (Asked September 08, 2020)

It is always safer to ground your generator.

Can I connect my RV 30 amp cord into the 120/240V 30A (L14-30R) receptacle? The panel says 15A max??? (Asked October 10, 2020)

You absolutely can. You just won't pull more than 15A amps out of it.

Can the 4375 be connected directly to the my homes' main panel box? (Asked October 17, 2020)

It can be connected to a transfer switch. Note that this connection should be made by a licensed electrician.

How much oil does the Predator 4375 hold? I cannot find that info anywhere. (Asked November 01, 2020)

Engine oil capacity is 0.6 quarts.

Can the generator be ran in snowy conditions (Asked February 15, 2021)

Please refer to our article on operating a generator in bad weather.

My question concerns the 240 volt outlet total amperage output. It lists here at (1x 120/240V 30A (L14-30R). So I take this to mean 30 amps even though the label painted on the side says 15 amps maximum. 30 amps would make sense as its combining both of the 15 amp 120 volt circuits. The 4375, the 6500, and the Predator 9000 all list identical outputs in the descriptions but on the unit they differ. So just trying to confirm total amp output as I plan on hooking up to the house panel. (Asked February 17, 2021)

It means that the outlet is 30 amps, as per its NEMA nomenclature (L14-30R). For the Predator 4375, this outlet won't output more than 15 amp. 15A x 240V = 3600W.

What are the valve gaps set at (Asked March 09, 2021)

Intake 0.004" – 0.006", Exhaust 0.006" – 0.008"

What’s the wiring look like mine came undone need to wire the start Hutton back up (Asked August 19, 2021)

The wiring diagram can be obtained through Harbor Freight's Customer Service: 1-800-444-3353.

Is the 240 outlet GFI protected (Asked September 06, 2021)

Only the two 5-20R duplexes are GFCI protected.

Does this unit require a battery? (Asked October 01, 2021)

The unit does not require a battery.

What is gas mix oil ratio for predator generator (Asked October 30, 2021)

The engine is 4-cycle, so do not mix gasoline with oil.

Where do I go for spare parts? I need a new starter pull cord assy. (Asked March 15, 2022)

Replacement parts can be ordered directly from Harbor Freight: 1-800-444-3353.

Is the predator 4375 solar panel compatible? (Asked January 13, 2023)

The unit requires gasoline to run. It cannot store solar energy.

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Predator 4375
7.4 Total Score
8 reviews
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User Reviews

Most Recent Most Helpful Highest Rating Lowest Rating Add your review
  1. Avatar
    Christina Lovley May 26, 2022 at 9:27 pm

    4375 a real power house in Disguise

    + PROS:
    • We have tasked the predator 4375 to the max and it is still powering our camp and has over 4500 hours on it! The fuel consumption was on point right on 14-16hr in the beginning, but after a issue with the carburetor coming loose and engine leaning out and screaming wide open the fuel consumption has been amazing! I don't know how the engine didn't blow up but we now use about half the fuel and at full load! We run the refrigerator,air conditioner(never shuts off) all the camps lights plus 6 500w halogen work lamps all night to illuminate the yard. Plus skillsaws chop saws and aircompressors! You would think it was the 8750 not the 4375!
    - CONS:
    • A little noisy
    Helpful(6) Unhelpful(0)You have already voted this
  2. 2.4

    No excuse the Total Harmonic Distortion (THD) is not posted. Very important for not trashing some sensitive electronics.

    + PROS:
    • Cost
    - CONS:
    • Total Harmonic Distortion
    Helpful(1) Unhelpful(4)You have already voted this
  3. 2.75

    Mine only lasted me one year and 2 weeks then engine locked up

    + PROS:
    • Loved it , bought it August 28 of 2020
    - CONS:
    • Engine locked up on September 22 of 2021, need to get it replaced how can I do this still looks brand new
    Helpful(4) Unhelpful(5)You have already voted this
  4. 5

    Ran our home during a 4~ day outage. Used the HF 50’ generator cable with it. Ran our fridge, all lights, 10k BTU AC, multiple fans and more with ease. Very good on gas. Noise isn’t bad at all. Sounds like every other generator I’ve ever heard.

    I live in a neighborhood, if my neighbors are bothered by the noise, they can chip in. Can’t even hear this generator on my back deck while inside with the doors shut.

    Really should come with the wheel kit as the photos advertise it with it.

    + PROS:
    • Great value.
    • Long runtime.
    • Easy to start.
    • Not louder than any other generator I’ve ever heard.
    - CONS:
    • Really needs wheel kit. Oil fill in poor location.
    Helpful(7) Unhelpful(1)You have already voted this
  5. 2.9

    Gfi outlets trip continuously while running only 7 amps!! Cannot replace existing 110 ac gfi outlets on the control panel. I have an 1800 Ironton generator that will run the same 7 amp equipment all day long!! I would not recommend purchasing a predator 4375 Generator!!

    + PROS:
    • Starts easily, quite,runs great
    - CONS:
    • Gfi trips
    Helpful(5) Unhelpful(1)You have already voted this
  6. 4.15

    Bought the generator as a backup power source for our home. Had to buy a wheel kit, but it was easy to install. Wished it had a data center, but I bought one via AMAZON. Hooked the generator to the house panel after having the panel fitted for it. The generator works perfectly in powering everything except the central air, it would power the central heat though. Overall…very happy with the purchase!

    + PROS:
    • Powers tho home via electrical panel
    • Value
    • Easy setup
    • Easy start
    • Portability
    - CONS:
    • Loud, even for a generator
    • No data center
    • No outlet covers
    • No wheel kit
    Helpful(5) Unhelpful(0)You have already voted this
  7. 4.5

    I bought the generator wheel kit. I watched a video about the generator. In the video, the man said he’d originally put the wheel mounts on backwards. I looked at the instructions. I tried to determine how to attach the wheel mounts. The kit didn’t come with the correct washers. I couldn’t attach the mounts with the provided washers. I wanted to put washers on both sides of the wheels. That’s what the directions show. I have lots of spare nuts, washers, etc. Unfortunately, didn’t have what was necessary. I had to make a run to the hardware store.
    I agree that the oil fill is in a poor location. The generator seems well built. Hopefully, I’ll get many years of use out of it.

    + PROS:
    • Will power a reasonable load.
    - CONS:
    • Doesn't come with a wheel package included. Oil fill is rather inconvenient. Could be a little quieter.
    Helpful(13) Unhelpful(1)You have already voted this
  8. 3.15

    Love this product, always wanted to own. Generator and this one was perfect for the price and accessibility.

    + PROS:
    • compact, with wheel cart easily movable, price was good.
    - CONS:
    • loud (being a generator and all), have to buy the other accessories including a grounding wire.
    Helpful(8) Unhelpful(8)You have already voted this

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