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Home > Outboard > Honda Outboard > Fuel / Carburetion System | Honda Outboard

Fuel and Carburetion System | Honda Outboard

Shop Honda outboard fuel and carburetion system parts by category, including carburetor kits, fuel pumps, fuel hose, primer bulbs, filters, and related fittings and clamps. Proper fuel delivery and mixture control are critical for reliable starting, smooth idle, strong acceleration, and dependable performance during maintenance, troubleshooting, and rebuild projects.

Shop Fuel and Carburetion Categories

Common Honda Fuel System Problems and Where to Start

Hard starting or will not start: start with Filters and Primer Bulbs to confirm fuel supply and prime function.
Bogging on acceleration or losing power at speed: inspect Fuel Hose, Fuel Hose Assemblies, and test Fuel Pumps for restriction or weak delivery.
Surging, rough idle, or stalling: focus on Carburetor Kits for clogged passages and worn internal components.
Fuel smell, wet spots, or visible leaks: inspect Gaskets and Seals, plus clamps and fittings in Hose and Ear Clamps and Hose Fittings.
Lean running or cylinder specific fueling issues: check Fuel Injectors where applicable and confirm clean fuel supply.

Fuel delivery problems are a top cause of drivability issues in outboards. Using fresh fuel, replacing filters on schedule, and maintaining tight, leak free hose connections helps prevent carburetor varnish, air leaks, and restriction related power loss.

Back to Honda Outboard

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1/2" Marine Fuel Hose Type A1 - MPI 360-12

Heavy-Duty Type A1 Bulk Fuel Line for High-Flow Marine Applications

1/2" Type A1 Marine Fuel Hose

MPI 360-12 1/2" Type A1 Marine Fuel Hose

The MPI 360-12 1/2" Type A1 Marine Fuel Hose is a heavy-duty bulk fuel line for marine fuel systems requiring a 1/2" inside diameter and the additional fire-resistant protection associated with Type A1 marine fuel hose.

The larger 1/2" inside diameter makes this hose suitable for higher-flow marine fuel-system applications where a larger supply line is required.

Pro Marine stocks the matching German-style hose clamp, installation tools and a complete clamp assortment for marine fuel-system service.

1/2" Type A1 Marine Fuel Line

Inside Diameter: 1/2"
Manufacturer: MPI Products
Fuel Hose Type: Type A1
Application: Marine Fuel System
Matching Clamp: German-Style Hose Clamp 4-4

What is Type A1 Marine Fuel Hose?

Type A1 marine fuel hose is designed for fuel-feed applications requiring a marine hose with enhanced fire-resistant performance.

Type A1 hose is commonly used in permanent marine fuel systems and installations where the fuel line passes through enclosed or below-deck areas.

When selecting fuel hose, both the inside diameter and the required hose classification should be verified for the installation.

Why Use 1/2" Fuel Hose?

A 1/2" fuel line provides greater internal flow area than the more common 1/4", 5/16" and 3/8" marine fuel hoses.

It may be used in applications where the engine or fuel-system design requires a larger fuel supply line to support higher fuel-flow demand.

Always follow the engine or boat manufacturer's required hose diameter rather than increasing or decreasing hose size without verifying the fuel-system requirements.

1/2" Fuel Line Usually Does Not Use a Primer Bulb

Unlike many smaller outboard fuel-line assemblies, a 1/2" marine fuel-line system would not normally use an inline hand primer bulb.

Larger 1/2" fuel lines are generally associated with higher-flow fuel systems where fuel delivery is handled by the engine's fuel-system configuration rather than a manual primer bulb.

Always follow the fuel-system design specified for the engine and boat.

Matching Fuel Hose Clamp

German-Style Hose Clamp - 4-4

Recommended hose clamp for the MPI 360-12 1/2" Type A1 marine fuel hose.

German-style hose clamps provide a secure connection for larger marine fuel-hose applications.

View German-Style Hose Clamp

Fuel Line Tools and Clamp Assortment

Oetiker Standard Jaw Pincer Tool

Useful installation tool for Oetiker ear clamps used throughout many marine fuel-line systems.

While this 1/2" hose uses the German-style clamp shown above, the pincer tool is useful when servicing other fuel-hose sizes that use Oetiker ear clamps.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool

Complete assortment of common Oetiker clamp sizes with the installation tool included.

A convenient option for marine shops and technicians servicing different fuel-hose sizes throughout a boat or engine.

View Oetiker Clamp Pack

What This Fuel Hose is Used For

MPI 360-12 is used when building, repairing or replacing a marine fuel supply line requiring 1/2" Type A1 hose.

Typical applications involve larger marine fuel systems where increased fuel-flow capacity is required and the installation calls for Type A1 hose.

Typical 1/2" Fuel-Line Setup

Depending on the boat and engine, a 1/2" marine fuel-line installation may include:

MPI 360-12 1/2" Type A1 marine fuel hose
German-style 4-4 hose clamps
Fuel tank pickup or shutoff valve
Fuel/water separator or filter assembly
Engine fuel-system connection
Application-specific fittings and adapters

Primer Bulb vs. Larger Fuel Systems

Smaller outboard fuel systems commonly use 1/4", 5/16" or 3/8" hose with an inline primer bulb.

A 1/2" fuel supply line generally indicates a higher-flow fuel system, and a hand primer bulb is not normally part of that configuration.

The engine manufacturer's fuel-system requirements should always take priority when determining hose size, fittings, filters and priming components.

Fuel Hose Size Comparison

Hose ID	Typical Pro Marine Fuel-Line Options	Primer Bulb Available
1/4"	Type A / Type B	Yes - Pro Marine 8002
5/16"	Type A / Type B / Mercury OEM	Yes - Pro Marine 8004
3/8"	Type A / Type B	Yes - Pro Marine 8005
1/2"	Type A1 - MPI 360-12	Normally not used

Key Features & Benefits

1/2" inside diameter
MPI Products marine fuel hose
Type A1 marine fuel-hose classification
Designed for fuel-feed applications requiring Type A1 hose
Suitable for higher-flow marine fuel systems
Common choice for enclosed or below-deck fuel-line routing when 1/2" hose is required
Matching German-style 4-4 hose clamp available
Primer bulb normally not used with 1/2" fuel-line systems
Fuel-system installation tools and clamp assortment available

Need Help Choosing the Right Marine Fuel Hose?

Fuel-line diameter, Type A or Type B classification, fuel-system flow requirements, fittings, filters and clamp selection all need to match the boat and engine installation.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is MPI 360-12?
This fuel hose has a 1/2" inside diameter.

What type of fuel hose is 360-12?
It is Type A1 marine fuel hose.

What is Type A1 fuel hose used for?
Type A1 is used for marine fuel-feed applications requiring the additional fire-resistant performance associated with Type A hose.

Can this hose be used below deck?
Type A1 hose is commonly used in enclosed and below-deck fuel-system installations when the fuel system calls for this hose size and classification.

Which clamp fits this 1/2" hose?
Use the German-Style 4-4 Hose Clamp .

Does this hose use an Oetiker ear clamp?
The recommended clamp for this hose is the German-style 4-4 hose clamp.

Does 1/2" fuel hose use a primer bulb?
A primer bulb is not normally used in a fuel system requiring 1/2" hose. Larger lines are typically used in higher-flow fuel systems with a different priming and fuel-delivery arrangement.

Should I use 1/2" hose just to increase fuel flow?
Use the hose diameter specified for the engine and fuel system. Increasing hose size without verifying the complete system is not a substitute for following the manufacturer's fuel-system requirements.

Do you sell fuel-line clamp tools?
Yes. Pro Marine stocks the Oetiker Standard Jaw Pincer Tool for fuel-line applications using Oetiker ear clamps.

Do you sell a complete clamp assortment?
Yes. The Oetiker Clamp Pack with Tool includes commonly used clamp sizes and an installation tool.

Dealer Discounts & Store Policies

Dealer / Marine Industry Discounts

Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.

Apply for a Dealer Account

Shipping Policy

Free shipping on orders over $100 in the continental U.S.
Orders received before 5:30 PM EST ship the same business day.
Typical delivery time is 1-5 business days.

30-Day Return Policy

Returns accepted within 30 days of delivery.
Parts must be new, unused and in original packaging.
Installed parts are not returnable.
Return authorization is required before sending items back.

Need help choosing the correct fuel-line parts?
Contact Pro Marine
Phone: 941-721-3000

Searchable Part Numbers & Terms

360-12, MPI 360-12, 1/2 fuel hose, 1/2 marine fuel hose, 1/2 boat fuel line, 1/2 Type A1 fuel hose, Type A1 marine fuel line, marine fuel supply hose, high flow marine fuel hose, large outboard fuel line, boat fuel hose, below deck fuel hose, enclosed marine fuel line, marine fuel line, German style hose clamp, 4-4 hose clamp, marine fuel hose clamp, bulk marine fuel hose, marine fuel system, fuel hose by the foot

Item#:

360-12

Manufacturer:

MPI Products

Available:

In Stock

4.9100

Your Price:

3.75

Foot

Qty:

1-1/2" Marine Fuel Fill Hose Type A2 - FILLHOSE-112

Reinforced Fuel Hose from Deck Fill to Marine Fuel Tank

Marine Fuel Tank Fill Hose

1-1/2" Type A2 Marine Fuel Fill Hose - FILLHOSE-112

FILLHOSE-112 is a 1-1/2" marine Type A2 fuel fill hose designed for the large-diameter fuel connection between the boat's deck-mounted gas fill and fuel tank.

Fuel fill hose is different from the smaller fuel-supply hose that carries gasoline from the tank to the engine. Its job is to safely route fuel from the deck fill fitting into the tank while providing the larger diameter needed during refueling.

Pro Marine also stocks the matching 4-8 German-style stainless-steel hose clamp, a 1-1/2" chrome gas deck fill, and a larger 2" Type A2 fuel fill hose.

1-1/2" Marine Fuel Fill Hose - FILLHOSE-112

Inside Diameter: 1-1/2"
Hose Type: USCG Type A2
Application: Marine Fuel Fill Line
Connects: Deck Fuel Fill to Fuel Tank
Matching Clamp: 4-8

What This Fuel Fill Hose is Used For

FILLHOSE-112 is intended for the fuel-fill portion of a permanently installed marine fuel system.

In a typical installation, the hose runs from the fitting directly behind the deck-mounted fuel cap down to the fuel tank's fill-neck connection.

Common applications include:

Boat fuel tank fill hose
Deck fill to fuel tank connection
Replacement of aged or deteriorated marine fuel fill hose
Boat restoration and fuel-system rerigging
New permanent marine fuel tank installations

What Does USCG Type A2 Mean?

Type A2 is a marine fuel-hose classification used for compatible fuel-system applications including fuel fill and vent lines.

Under federal marine fuel-system requirements, Type A hose is constructed to meet a fire-resistance test. Type A2 is a Class 2 hose designation.

The important application distinction for this product is that Type A2 hose is suitable for a marine fuel fill or vent line. It should not be confused with the smaller Type A1 fuel hose commonly used in fuel-feed applications.

Fuel Fill Hose is Not Engine Fuel-Supply Hose

This 1-1/2" hose is intended for the deck fill to fuel tank connection.

Do not select fuel hose only by diameter. Fuel fill, vent and tank-to-engine fuel lines have different applications and hose requirements.

Matching 1-1/2" Fuel Fill Hose Clamp

German-Style Hose Clamp - 4-8

Matching clamp for the 1-1/2" fuel fill hose installation.

Pro Marine's 4-8 German-style clamp has a 27-51mm / 1.05-1.99" clamping range and is made from 316 stainless steel.

Secure the hose at the deck-fill fitting and fuel-tank fill neck according to the requirements of the installation.

View 4-8 German-Style Hose Clamp

1-1/2" Chrome Gas Deck Fill

Chrome 1-1/2" Gas Deck Fill - 3-5740

Universal 1-1/2" chrome gas deck fill for compatible marine fuel systems.

The fuel fill hose connects to the hose barb beneath the deck fill and routes gasoline down to the permanent fuel tank.

View 1-1/2" Chrome Gas Deck Fill

1-1/2" and 2" Fuel Fill Hose Options

Size	Fuel Fill Hose	Type	Matching Clamp
1-1/2"	FILLHOSE-112	USCG Type A2	4-8
2"	FILLHOSE-2	USCG Type A2	4-9

Need 2" Fuel Fill Hose?

2" Type A2 Fuel Fill Hose - FILLHOSE-2

Larger Type A2 fuel fill hose for marine installations using a 2" tank fill and deck-fill connection.

View 2" Fuel Fill Hose

German-Style Hose Clamp - 4-9

Matching clamp option supplied for Pro Marine's 2" Type A2 fuel fill hose.

View 4-9 Hose Clamp

Fuel Fill Hose Installation Tips

Match the hose inside diameter to the deck fill and fuel-tank fill connection.
Use marine fuel hose specifically designed for fuel-fill applications.
Use properly sized corrosion-resistant hose clamps.
Make sure the hose is fully seated on each fitting before clamping.
Avoid sharp bends that can restrict fuel flow while filling the tank.
Route the hose so it cannot be crushed by batteries, storage or other equipment.
Keep the hose away from sharp edges and moving components.
Inspect the entire fill hose for cracking, hardening and deterioration.
Check all connections for fuel seepage after installation.

Avoid Sharp Bends in Fuel Fill Hose

Fuel fill hose is large and heavily constructed. Plan the routing before cutting the hose.

A smooth path from the deck fill to the tank helps fuel flow freely during refueling and reduces the chance of creating a low spot, restriction or kink.

When Should Marine Fuel Fill Hose Be Replaced?

Fuel fill hose should be inspected whenever the fuel tank, deck fill or surrounding rigging is serviced.

Consider replacement if you find:

Cracking in the outer hose
Dry, hardened or brittle hose
Soft or swollen areas
Abrasion or chafing
Fuel odor around the fill-hose area
Visible fuel seepage
Damaged or heavily corroded clamps
Hose that no longer fits securely on the fill fitting or tank

How the Marine Fuel Fill System Works

When gasoline is added through the deck-mounted gas cap, it travels through the large-diameter fuel fill hose and into the permanent fuel tank.

A separate fuel-tank vent system allows displaced air to escape while the tank is being filled.

The fuel fill hose, deck fill, tank connection and vent system all need to remain correctly routed and unobstructed for reliable refueling.

Key Features and Benefits

1-1/2" marine fuel fill hose
USCG Type A2 hose
Designed for deck-fill to fuel-tank applications
Large diameter for marine fuel filling
Matching 4-8 German-style clamp available
Matching 1-1/2" chrome deck fill available
2" Type A2 fuel fill hose also available
Useful for new fuel-system installations and replacement projects

FAQ

What size is FILLHOSE-112?
FILLHOSE-112 is 1-1/2" inside-diameter marine fuel fill hose.

What is this hose used for?
It connects the boat's deck-mounted fuel fill to the fill connection on the permanent marine fuel tank.

Is FILLHOSE-112 Type A2?
Yes. This hose is listed as USCG Type A2.

Can I use this as the fuel hose from the tank to the engine?
This product is intended as large-diameter fuel fill hose. Use the proper marine fuel-supply hose specified for the tank-to-engine portion of the fuel system.

Which clamp fits the 1-1/2" fuel fill hose?
Pro Marine pairs it with the 4-8 German-Style Hose Clamp .

Do you stock a 1-1/2" fuel deck fill?
Yes. Pro Marine stocks the 3-5740 Chrome 1-1/2" Gas Deck Fill .

Do you have 2" fuel fill hose?
Yes. Pro Marine also stocks FILLHOSE-2 2" Type A2 Fuel Fill Hose .

How do I know whether I need 1-1/2" or 2" hose?
Measure or verify the hose connection size on both the deck fill and the fuel tank. The replacement hose needs to match the fittings used in the boat's fuel-fill system.