DuroStar DUAL FUEL DS4400EHF User Manual (English)

Questions and Answers:

K
Kimberly ColeAug 5, 2025
Why won't my DuroStar DUAL FUEL DS4400EHF Portable Generator start?
- K
  Kelsey WilliamsAug 5, 2025
  If your DuroStar Portable Generator's engine won't start, there are several potential causes. First, ensure the Engine Switch is set to "Run." Next, check that the Fuel Valve is "Open." Also, make sure the choke is closed. The engine may be out of fuel, or the fuel may be old or contaminated, requiring you to add or change the fuel. A dirty or broken spark plug could also be the culprit, so clean or replace it. Additionally, ensure the generator is on a level surface and that the oil level is sufficient, adding or changing the oil if necessary.
C
Connie StewartAug 14, 2025
What to do if DuroStar DUAL FUEL DS4400EHF Portable Generator runs, but does not support all electrical devices connected?
- B
  Benjamin QuinnAug 14, 2025
  If your DuroStar Portable Generator runs but doesn't support all connected electrical devices, it might be overloaded. Try disconnecting one or more items to reduce the load. A malfunctioning device connected to the generator could also be the issue, so disconnect any suspected devices. Lastly, a dirty air cleaner can cause this problem, so clean or replace the air filter.
M
Michael SmithAug 25, 2025
What to do if DuroStar Portable Generator engine runs, but there is no electrical output?
- A
  allen82Aug 26, 2025
  If your DuroStar Portable Generator engine runs but there's no electrical output, check if the Circuit Breaker is in the "Off" position and turn it "On". A bad wiring connection could also be the cause, so replace the extension cord(s). Additionally, a malfunctioning device connected to the generator might be the problem; disconnect it to see if that resolves the issue.

DuroStar DUAL FUEL DS4400EHF Specifications

General

Brand	DuroStar
Model	DUAL FUEL DS4400EHF
Category	Portable Generator
Language	English

Summary

Key Generator Features

Dual Fuel Option

Offers both LPG and gasoline operation for versatile use.

Engine Specifications

Features a durable 7.0 HP, air-cooled overhead valve engine.

Heavy Duty Frame

Steel frame with isolated mounts for smooth, quiet operation.

Easy Transport Kit

Includes wheel and handle kit for convenient moving.

Control Panel Overview

Equipped with shutoff switch, volt meter, circuit breaker, and outlets.

Power Outlet Options

Provides (2) 120V outlets and (1) 120V/240V twist-lock outlet.

Extended Run Time

Offers an 8-hour run time on a full tank.

Fuel Tank Design

All-steel 4.0-gallon tank with an EZ-read gauge.

Low Oil Protection

Automatic shut-off protects engine from low oil levels.

Noise Reduction

Super quiet muffler reduces engine noise.

Emission Compliance

Meets U.S. EPA emission standards for small off-road equipment.

General Safety Procedures

Carbon Monoxide Hazard

Generator exhaust contains toxic CO gas; use outdoors only.

Exhaust Chemical Warning

Exhaust contains chemicals known to cause cancer/birth defects.

Flammable Vapor Warning

Gasoline vapors are highly flammable and explosive; avoid ignition sources.

Refueling Safety Precautions

Turn off engine, cool down, loosen cap slowly, check for spills.

Electrical and Heat Safety

Electrocution Hazard

Generator produces high voltage. Always ground the unit before use.

Wet Conditions Warning

Do not use in rainy or wet conditions; avoid touching bare wires.

Hot Surface Warning

Generator surfaces, especially exhaust, can exceed 150°F (65°C).

Safe Operating Practices

Use for intended purpose, on level surfaces, allow warm-up, don't overload.

Generator Hazard Markings

Poisonous Gas Warning

Generator exhaust contains toxic CO gas; never operate indoors.

Risk of Explosion Warning

Stop generator before refueling; check for spilled fuel; avoid open flames.

Hot Exhaust Caution

Cautionary label indicating hot exhaust surfaces not to touch.

High Temperature Caution

Cautionary label indicating high temperature surfaces not to touch.

Package Contents

Included Accessories

Lists items included with the generator: screwdriver, spanner, spark plug wrench.

Generator Components

Front Panel Components

Identifies numbered components on the generator's front panel.

Rear/Side Components

Identifies numbered components on the generator's rear and side.

Generator Component Details

Engine Ignition and Fuel Components

Details carburetor, fuel filter cup, fuel valve, spark plug, muffler.

LPG System Components

Details propane tank connector, regulator, and pressure release valve.

Preparing the Generator for Use

Adding Engine Oil

Step-by-step guide for adding the correct amount of engine oil.

Recommended Oil Type

Specifies SAE 10W-30 oil and provides viscosity chart.

Adding Fuel and Oil Procedures

Adding Engine Oil Steps

Detailed steps for adding oil, including checking the level.

Adding Gasoline

Instructions for adding fresh, unleaded gasoline of 87 octane or higher.

Grounding and Fueling Procedures

Fueling Precautions

Important notes on fuel usage, storage, and avoiding contamination.

Grounding the Generator

Procedure for grounding the generator to prevent electrocution.

Subsequent Use of the Generator

Engine Oil Level Check

Procedure to check oil level before each use for sufficient amount.

Gas Level Check

How to check gasoline level and refuel using the fuel gauge.

Starting the Generator: Gasoline

Gasoline Starting Procedure

Step-by-step instructions for starting the generator using gasoline.

Starter Motor Warning

Warning about operating the starter motor for extended periods.

Stopping the Engine (Gasoline)

Normal and emergency procedures for stopping the gasoline engine.

Starting the Generator: Propane

Propane Starting Procedure

Step-by-step instructions for starting the generator using propane.

Choke Operation (Propane)

Explains choke operation for warm vs. cold engine starts.

Stopping the Engine (Propane)

Procedures for stopping the propane engine in normal use and emergencies.

Propane Operation Warnings

Ignition Source Proximity Warning

Keep ignition sources away from generator when using LPG.

Connecting Electrical Devices (LPG)

Instructions on when and how to connect devices after engine runs smoothly.

Propane Leak Procedure

Steps to take in case of a propane gas leak.

Stopping Engine with LPG

Procedure for safely shutting down generator when using LPG.

Using the Generator

AC Power Usage Guidelines

How to connect electrical devices based on their wattage requirements.

Generator Rated and Surge Wattage

Details rated and surge wattage for the generator model.

Calculating Load Wattage

How to calculate device wattage and compare to generator capacity.

Appliance Wattage Estimates

Appliance Wattage Chart

Table listing estimated wattage for common electrical devices.

Safe Device Connection Practices

Advice on selecting devices and avoiding overloading the generator.

Connecting a Load to the Generator

Generator Outlet Usage

Guidance on connecting 120V and 240V devices to correct outlets.

Connecting Loads Sequence

Steps for plugging in devices, switching breaker, and turning on devices.

Voltage Selector Switch Function

How to use the voltage selector for 120V ONLY or 120/240V output.

Voltage Selector Switch Safety

Warning: only change switch with AC circuit breaker OFF.

Extension Cord Guidance

Power Cord Gauge Recommendations

Chart providing recommended wire gauge by length and amperage.

DC Output Port Restrictions

DC receptacle is for 12V batteries only; do not jump-start cars.

12V Battery Charging Setup

Steps for connecting a 12V battery to the DC charging posts.

Battery Charging Safety Precautions

Warnings on explosive gas, acid, and protective gear during charging.

Generator Maintenance and Care

Significance of Routine Maintenance

Explains why routine maintenance is essential for safe operation.

Safety During Maintenance

Safety rules to follow before performing any maintenance or repairs.

Scheduled Maintenance Intervals

Schedule outlining services at specific intervals.

Engine Oil Level Check

Procedure for Checking Oil Level

Step-by-step guide to check oil level before each use.

Generator Engine Oil Capacity

States the engine oil capacity: 20 fl. oz.

Engine Oil Change Procedure

Procedure for Draining Oil

Steps for draining crankcase oil, typically for contamination.

Procedure for Adding Oil

Instructions for adding motor oil, recommending SAE 10W30.

Air Cleaner Servicing

Air Cleaner Element Cleaning and Oiling

Procedure to clean and re-oil the air cleaner sponge elements.

Fuel Filter Cup Maintenance

Procedure for Cleaning Fuel Filter Cup

Steps to clean the fuel filter cup to trap dirt and water.

Spark Plug Servicing

Spark Plug Inspection and Gapping

How to inspect, clean, and gap spark plug for proper operation.

Fuel Tank Draining Procedure

Procedure for Draining Gas Tank

Procedure to drain all gasoline from the tank before storage.

Fuel Storage Advisory

Caution against storing fuel from one season to another.

Generator Storage and Transport

Guidelines for Transporting Generator

Steps for transporting, including emptying the tank.

Short-Term Generator Storage

Procedures for storing the generator for less than 30 days.

Long-Term Generator Storage

Procedures for storing over 30 days, including oiling cylinder.

Generator Technical Specifications

AC/DC Electrical Specifications

Lists AC/DC voltage, amperage, frequency, and phase details.

Physical and Engine Details

Details dimensions, engine type, displacement, starting type, fuel capacity.

Performance and Operational Specs

Lists oil capacity, run times, and noise level.

Generator Troubleshooting Guide

Troubleshooting: Engine Start Failure

Common causes and solutions for engine not starting.

Troubleshooting: No Power Output

Addresses problems where engine runs but produces no power.

Troubleshooting: Load Support Problems

Solutions for when generator cannot support connected devices.

Assembly of Wheel Kit

Wheel Kit Installation Steps

Step-by-step instructions for assembling the wheel kit.

Carbon Brush Maintenance

Procedure for Carbon Brush Replacement

Visual guide on replacing carbon brushes.

AVR Maintenance

Procedure for AVR Replacement

Visual guide on replacing the AVR.

Generator Maintenance Log

Maintenance Service Record Entry

Template for logging maintenance performed on the generator.

Generator Wiring Diagram

Wiring Schematic Overview

Diagram illustrating the electrical connections of the generator set.

Engine Component Identification

Exploded View of Engine Parts

Visual diagram showing the exploded view of engine components.

Detailed Engine Parts List

List of Engine Component Part Numbers

Detailed list of engine parts with part numbers and descriptions.

External Generator Components

Diagram of External Generator Parts

Visual diagram showing various external generator components.

Detailed External Generator Parts List

List of External Generator Part Numbers

Detailed list of external generator parts with part numbers and descriptions.

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DuroStar DUAL FUEL DS4400EHF User Manual

Table of Contents

Questions and Answers:

DuroStar DUAL FUEL DS4400EHF Specifications

Summary

Key Generator Features

Dual Fuel Option

Engine Specifications

Heavy Duty Frame

Easy Transport Kit

Control Panel Overview

Power Outlet Options

Extended Run Time

Fuel Tank Design

Low Oil Protection

Noise Reduction

Emission Compliance

General Safety Procedures

Carbon Monoxide Hazard

Exhaust Chemical Warning

Flammable Vapor Warning

Refueling Safety Precautions

Electrical and Heat Safety

Electrocution Hazard

Wet Conditions Warning

Hot Surface Warning

Safe Operating Practices

Generator Hazard Markings

Poisonous Gas Warning

Risk of Explosion Warning

Hot Exhaust Caution

High Temperature Caution

Package Contents

Included Accessories

Generator Components

Front Panel Components

Rear/Side Components

Generator Component Details

Engine Ignition and Fuel Components

LPG System Components

Preparing the Generator for Use

Adding Engine Oil

Recommended Oil Type

Adding Fuel and Oil Procedures

Adding Engine Oil Steps

Adding Gasoline

Grounding and Fueling Procedures

Fueling Precautions

Grounding the Generator

Subsequent Use of the Generator

Engine Oil Level Check

Gas Level Check

Starting the Generator: Gasoline

Gasoline Starting Procedure

Starter Motor Warning

Stopping the Engine (Gasoline)

Starting the Generator: Propane

Propane Starting Procedure

Choke Operation (Propane)

Stopping the Engine (Propane)

Propane Operation Warnings

Ignition Source Proximity Warning

Connecting Electrical Devices (LPG)

Propane Leak Procedure

Stopping Engine with LPG

Using the Generator

AC Power Usage Guidelines

Generator Rated and Surge Wattage

Calculating Load Wattage

Appliance Wattage Estimates

Appliance Wattage Chart

Safe Device Connection Practices

Connecting a Load to the Generator

Generator Outlet Usage

Connecting Loads Sequence

Voltage Selector Switch Function

Voltage Selector Switch Safety

Extension Cord Guidance

Power Cord Gauge Recommendations

DC Output Port Restrictions