Chikia Hisun EFI Fuel Pump Assembly for 400–750 UTVs (Pre-2021) — OEM Fit, Single Unit

Chikia Hisun OEM Fuel Pump is a direct-replacement EFI fuel pump assembly designed for pre-2021 Hisun 400–750 UTV and compatible models, supplying reliable fuel delivery for affected engines.

This fuel pump assembly is an OEM-compatible component intended to replace worn or failed EFI pumps on a range of Hisun and other branded UTVs produced before 2021. It fits multiple models including Hisun 400, 450, 500, 550, 700 and 750, and selected MSU, Axis, Coleman, Bennche and Cub Cadet machines where the listed part numbers apply. The unit ships as a single pump assembly and matches manufacturer part references to help ensure proper fit and function.

Which models and part numbers does this fuel pump fit?

The Chikia Hisun OEM pump is built to match specific OEM part numbers and vehicle lists for pre-2021 EFI models. Confirm compatibility by checking your vehicle’s part number against the list before purchase.

• Manufacturer Part Numbers: 39500-115H-0000, 358700002, 16521-055-0000.
• Compatible Hisun models: 400, 450, 500, 550, 700, 750 (pre-2021 EFI).
• Other compatible brands: MSU 500/700, Axis 500/700, Coleman UT500/UT700, Bennche Bighorn 500/700, Cub Cadet Challenger 500/550/700/750.
• Not compatible with Massimo T-Boss/Buck series or Bennche T-Boss models.

How do I know this is the correct replacement for my UTV?

Use the listed part numbers and your vehicle’s year and model to verify fitment. If your UTV is a pre-2021 EFI model appearing on the compatibility list, this assembly is likely the correct match; otherwise consult a mechanic or dealer.

• Compare your current pump’s part number to the provided references.
• Check the vehicle’s model year—this pump is for models made before 2021.
• Review brand exceptions: not for Massimo T-Boss/Buck or Bennche T-Boss series.

What’s included and what should I expect during installation?

The package contains one complete fuel pump assembly intended to replace the original EFI pump. Installation generally follows standard EFI fuel pump replacement steps; professional installation or a service manual is recommended if you are not experienced with fuel systems.

• Package contents: 1 x Fuel Pump Assy—no extra hoses or fittings included.
• Typical installation: remove old pump, swap assembly, reconnect electrical and fuel lines, verify seals and clamps.
• Tools needed: basic hand tools, safety gloves, fuel-safe container for any residual fuel.

Will this pump affect engine performance or warranty?

This unit is sold as an OEM-compatible replacement designed to restore proper fuel delivery, not as a performance upgrade. Installing an aftermarket or OEM replacement may have implications for manufacturer warranties—check your vehicle’s warranty terms and consult the dealer if in doubt.

• Designed to match original fuel delivery specifications for compatible models.
• Not marketed as a performance-enhancing part—intended for maintenance or repair.
• Warranty effects vary by vehicle and dealer—confirm before installation.

Who is this for: This Chikia Hisun OEM fuel pump assembly is for owners and technicians maintaining pre-2021 Hisun and compatible UTVs who need a direct replacement for a failed or worn EFI pump. It suits DIY mechanics comfortable with fuel-system work and professional shops seeking a part that references OEM numbers for fitment. If your vehicle matches the included part numbers and model list, this pump provides a straightforward way to restore the EFI fuel delivery system.