5033709 Johnson 15770-90J02 Suzuki Fuel Cooler | 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.

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

🚤 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

🛠️ Service Notes

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

🔄 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

📦 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