# 5033709 Johnson 15770-90J02 Suzuki Fuel Cool Rail | Genuine Used Part

🔧 Product Description

  

Genuine Used Johnson Suzuki DF90-DF140 Fuel Cooler - Part Numbers: 5033709 and 15770-90J02

  

A genuine pre-owned fuel-cooler assembly for selected Suzuki-built Johnson four-stroke outboards and Suzuki DF90, DF100, DF115 and DF140 engines.

  

Although the supplied title refers to a fuel cool rail, OEM catalogues identify 5033709 / 15770-90J02 as the fuel cooler.

  

The cooler transfers heat from the circulating fuel to the engine's cooling-water circuit before the fuel returns to or passes through the electronic fuel-injection system.

  

⚙️ Key Features

  

• Genuine Johnson, BRP or Suzuki used fuel cooler

• Johnson / BRP number 5033709

• Suzuki number 15770-90J02

• Fuel-to-water heat-exchanger construction

• Used with delivery rail 5033537 / 15751-90J03

• Suitable for selected 90HP-140HP four-strokes

• Original Suzuki-manufactured component

  

🔄 Supersession & Cross Reference

  

OEM Supersession / Related Numbers:

  

• 5033709

• 15770-90J02

• 1577090J02

• 15770-90J00 - Earlier related cooler reference

• 15770-90J01 - Earlier related cooler reference

• Related delivery pipe: 15750-90J00

• Related later delivery pipe: 15751-90J03

• Johnson delivery-pipe reference: 5033537

• Fuel-hose union: 15773-90J00

• Fuel-cooler bracket: 15775-90J00

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on selected:

  

• Johnson 90HP four-stroke

• Johnson 100HP four-stroke

• Johnson 115HP four-stroke

• Johnson 140HP four-stroke

• Suzuki DF90

• Suzuki DF100

• Suzuki DF115

• Suzuki DF140

  

Representative production period:

  

• Approximately 2001-2011, model and serial-number dependent

  

Verified examples include:

  

• 2002 Suzuki DF140

• 2003 Johnson 115HP four-stroke

• Selected later DF100, DF115 and DF140 applications using 15770-90J02

  

Important fitment note:

  

• This is the fuel cooler, not the delivery rail.

• Confirm the cooling-water and fuel-hose connections.

• Internal corrosion can allow water and fuel circuits to leak into one another.

• Hoses, unions, bracket and rail are included only when shown or stated.

  

🔌 Function

  

The cooler reduces fuel temperature and helps control vapour formation in the electronic fuel-injection system.

  

Common signs of failure:

  

• Fuel becomes excessively warm

• Hot restart is difficult

• Engine surges under load

• Fuel odour or leakage

• Cooling water leaks from the housing

• Water contaminates the fuel system

• Internal corrosion blocks coolant flow

• Fuel hose connections corrode

• Engine loses power after prolonged operation

  

Recommended checks before installation:

  

• Inspect both fuel and water passages

• Pressure-test the cooler circuits separately

• Check for internal cross-leakage

• Replace hardened hoses and sealing washers

• Inspect unions and mounting brackets

• Flush salt and debris from the cooling passage

• Check the fuel rail and injectors for water contamination

• Perform a fuel-pressure and leak test after installation

  

📦 Condition

  

• Genuine Johnson, BRP or Suzuki used part

• Pre-owned fuel and cooling-system component

• Cosmetic corrosion and residue may be present

• Pressure testing and internal inspection are strongly recommended

• Supplied components are limited to those shown or described

• Supplied in protective or equivalent packaging

## Details

- **Price:** 35.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Fuel Rails & Components | EFI Fuel Rail Systems

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 35.00 AUD | In stock |

## Images

- 5033709 Johnson 15770-90J02 Suzuki Fuel Cool Rail | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/5033709-johnson-15770-90j02-suzuki-fuel-cool-rail-genuine-used-part)
> Updated: 2026-08-15