Denso HP3 294000-0901 Fuel Pump: Common Failures & Repair Guide for Toyota 1KD/2KD Diesel Engines
Denso HP3 294000-0901 common rail fuel pump is widely used in Toyota 1KD-FTV and 2KD-FTV diesel engines, including Hilux, Hiace, Dyna, and other D-4D applications.
This second-generation HP3 pump delivers up to 1,800 bar fuel pressure with a two-cylinder radial piston design and electronic SCV control.
Common failure symptoms include:
⚠️ Hard starting or long cranking ⚠️ Power loss under load ⚠️ Unstable rail pressure ⚠️ DTC codes P0087 / P0088 / P0089 ⚠️ Metal particles caused by fuel contamination
The most common causes are:
• SCV valve malfunction • Poor diesel fuel quality • Plunger and barrel wear • Fuel system contamination
Proper diagnosis is important before replacing the pump. If no internal damage exists, SCV replacement or pump overhaul may restore performance. However, metal contamination requires complete fuel system inspection.
Pioneer Diesel Parts supplies aftermarket diesel injection components, including common rail fuel pumps, injectors, and repair solutions for Toyota diesel applications.
Learn more about Denso HP3 294000-0901 fuel pump problems, testing methods, and repair options.