Fuel Common Rail Assembly 31440-48010 for Hyundai Engine HD78 D4G4

Fuel Common Rail Assembly 31440-48010 for Hyundai Engine HD78 D4G4

This fuel pump is engineered as a direct replacement for the Hyundai Engine HD78 D4G4. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.

Vehicle Compatibility

Replaces OEM Part Numbers

31440-48010

Signs You Need a Replacement

If your equipment is showing any of these symptoms, the common rail assembly may be the cause:

• Engine cranks but won’t start — The pump may have lost prime or stopped delivering fuel. Check for fuel at the filter outlet before replacing the pump.
• Stalling under load — A weak pump can’t maintain pressure at high demand. The engine runs fine at idle but dies when you put it to work.
• Fuel pressure warning (if equipped) — Modern equipment monitors fuel rail pressure. A low-pressure warning often means the pump is failing.
• Loud whining from fuel system — A failing pump makes a high-pitched whine that gets louder as it warms up. Normal pump noise is a low hum.
• Air in fuel lines — If you see bubbles in the transparent fuel line or the primer bulb won’t stay firm, the pump may be drawing air through a worn seal.
• Excessive return flow — Too much fuel returning to the tank instead of reaching the injectors indicates internal pump wear.

Before You Replace the Pump

Before replacing the pump, check the fuel filter and fuel lines for restrictions. A blocked filter causes the same symptoms as a failing pump on equipment. When installing the new pump, fill it with clean fuel before connecting the lines — this reduces priming time and prevents dry-run damage. After installation, bleed the system fully and check for leaks at all connection points. Replace the fuel filter at the same time as the pump to protect the new unit from debris.

Frequently Asked Questions

Will this fit my Hyundai HD78?
Yes. This part is designed to fit the Hyundai HD78 among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.

Does this replace OEM number 31440-48010?
Yes. This is a direct aftermarket replacement for 31440-48010. It matches the original dimensions, connector type, and operating specifications. No modifications to your vehicle or equipment are required.

How do I check if my engine code (HD78) matches?
The engine code is stamped on a metal tag attached to the engine block, usually near the timing belt cover or on the cylinder head. Compare the code you find with the list above. Engine codes are 3 to 6 characters long.

My vehicle is a 1440 model – is it covered?
The compatibility range for this part includes 1440-4801. The 1440 model year falls within this range, but verify the engine code and body type match. Mid-year production changes sometimes mean two vehicles from the same model year use different parts.