Mitsubishi Fuso FK and FM series trucks are workhorses in medium‑duty distribution, construction, and logistics. At the core of their 6M60T 7.5‑litre turbo‑diesel engine lies the Denso HP4 common rail fuel injection pump – a high‑pressure precision component that ensures powerful acceleration, low fuel consumption, and clean emissions. The 294050-0054 (original Mitsubishi number ME306387) is a direct replacement pump, fully compatible with Denso HP4 architecture. It delivers stable rail pressure up to 2,000 bar, making it ideal for demanding stop‑start urban delivery or long‑haul operations.
Rsolid Engine Parts supplies the 294050-0054 as a brand‑new, Denso‑compatible unit – 100% calibration tested, and backed by a full 12‑month warranty at competitive fleet and workshop prices.
1. Structural Advantages of the Denso HP4 294050-0054 Pump
The 294050-0054 is based on the Denso HP4 platform – a proven high‑pressure common rail pump used extensively by Mitsubishi Fuso. Its engineering offers multiple benefits for the 6M60T engine:
Two‑Plunger Radial Piston Design – Two precision plungers arranged radially around a polished eccentric cam deliver high‑volume fuel flow with extremely low pressure pulsation. This reduces stress on the common rail and injectors, which is essential for the high‑mileage life of FK/FM trucks.
Integrated Vane‑Type Transfer Pump – A built‑in low‑pressure vane pump draws fuel directly from the tank and supplies the high‑pressure section via a Suction Control Valve (SCV) . This eliminates the need for an external lift pump and guarantees stable feed pressure even at low engine speeds.
High‑Pressure Capability (2,000 bar) – The HP4 platform generates rail pressures up to 2,000 bar (29,000 psi) , enabling superior fuel atomisation, cleaner combustion, reduced soot, and lower fuel consumption – fully compliant with Euro 4, Euro 5, and Japan Post‑New Long‑Term emission regulations.
Precise Suction Control Valve (SCV) – An electronically controlled SCV meters the exact fuel volume entering the plunger chambers based on real‑time ECU demand. This delivers accurate rail pressure control, sharper throttle response, and optimised fuel economy.
Heavy‑Duty Drive Shaft & Needle Bearings – The pump features a reinforced drive shaft supported by needle bearings, designed to withstand the high torsional loads of a 7.5‑litre straight‑six engine. This ensures long service life in both distribution and long‑haul applications.
High‑Pressure Fuel Lubrication – All moving internal parts (plungers, roller shoes, eccentric cam) are lubricated solely by diesel fuel, eliminating external oil lines and simplifying installation.
Direct Denso / Mitsubishi Compatibility – Identical mounting flange (3‑bolt SAE A), drive gear interface, high‑pressure outlet ports, and electrical connectors as the original Denso 294050-0054. Truly plug‑and‑play.
Cross‑Reference Versatility – The 294050-0054 is also listed under 294050-0050, 294050-0051, 294050-0052, 294050-0053, and Mitsubishi numbers ME302145, ME304303, ME306387, making it easy to verify fitment.
2. Compatible Mitsubishi Fuso Models (≤5)
The 294050-0054 pump is specifically calibrated for the Mitsubishi 6M60T common rail diesel engine (7.5 L, inline‑6, turbo). Compatible vehicles include:
Mitsubishi Fuso FK (Fighter FK) – Medium‑duty trucks (e.g., FK62F, FK65F) with 240–270 hp 6M60‑T1 variants.
Mitsubishi Fuso FM (Fighter FM) – Medium‑/heavy‑duty trucks (e.g., FM65F, FM67F) with higher torque (approx. 784 Nm).
Mitsubishi Fuso FH (Fighter FH) – Heavy‑duty long‑haul trucks sharing the same 6M60T engine family.
Mitsubishi Fuso Super Great – Some heavy‑duty models (depending on market and year) with the 6M60 engine.
Mitsubishi Fighter 6M60‑T1 (7.5d) – Direct engine code reference for 240–280 bhp variants.
✅ Important Fitment Note – Always verify the Bosch/Denso number on your original pump (stamped on the nameplate) and your engine code (6M60, 6M60T, or 6M60‑T1). The pump also carries Mitsubishi OEM numbers ME306387, ME302145, ME304303. Contact us if your pump number differs.
3. Common Failures & Professional Installation/Replacement Advice
3.1 Typical Symptoms of a Failing 294050-0054 Pump
Loss of power under load – The truck struggles to climb hills or accelerate when fully loaded, often accompanied by black exhaust smoke.
Extended cranking time before start – Engine takes longer to start, especially after an overnight stop.
Engine surging / rough idle – Inconsistent fuel delivery at low RPM, causing hunting or misfiring.
DTC codes P0087, P0088, or P0191 – Rail pressure too low, too high, or sensor rationality fault. Use Mitsubishi MUT‑III or a generic diagnostic tool with live data.
Metal particles in the fuel filter – A clear sign of HP4 internal wear (plunger scuffing or roller bearing failure). Even fine ferrous particles indicate imminent pump failure.
Hard starting when hot – Vapour lock symptoms that often point to a failing Suction Control Valve (SCV).
Diesel contamination in engine oil – A failed drive shaft seal allows fuel to enter the crankcase, leading to rising oil level and a strong diesel smell.
3.2 Professional Installation & Replacement Recommendations
Perform a full fuel system diagnosis – Use MUT‑III or a compatible scanner to read fault codes, monitor rail pressure, measure injector return flow rates, and test the SCV.
Replace the Suction Control Valve (SCV) – If the old pump has failed internally, fit a new Denso SCV together with the pump. A faulty SCV is a common cause of repeat failures.
Replace all fuel filters – Install new primary (water separator) and secondary fuel filters before running the new pump. The HP4 is highly sensitive to contamination.
Flush the entire fuel system – Drain and clean the fuel tank. Blow out all supply and return lines with compressed air. Replace any rubber hoses that show degradation. This step is non‑negotiable – debris from a failed pump will destroy a new HP4 within minutes.
Inspect and flow‑test all injectors – High return flow from worn injectors will prevent correct rail pressure and cause repeat pump failure. Have all six injectors professionally cleaned or replaced on a Bosch EPS or Denso test bench.
Replace engine oil and filter – If diesel has contaminated the oil (rising level or diesel smell), change the oil and filter BEFORE running the new pump.
Prime the low‑pressure circuit – Use a hand vacuum pump on the fuel return line to pull bubble‑free fuel through the pump and filters. HP4 pumps are extremely sensitive to aeration – never dry‑crank.
Fill the pump with clean diesel – Remove the high‑pressure outlet fitting and pour clean, lubricious diesel (or Denso assembly lubricant) into the pump housing to prevent dry start scoring.
Torque all connections to specification – High‑pressure outlet (M14×1.5 cone seal): 40–45 Nm. Low‑pressure inlet (M16×1.5): 25 Nm. High‑pressure line union nuts: 35–40 Nm. Drive shaft nut: consult Mitsubishi workshop manual (typically 100–120 Nm). Use a calibrated torque wrench.
Reset fuel adaptations – After installation, use MUT‑III to clear learned fuel trim values and perform a “high‑pressure pump adaptation” or “fuel system learn” routine.
Perform a leak test – Idle the engine for 10 minutes, then inspect all high‑pressure and low‑pressure unions, the pump mounting area, and the drive shaft seal for signs of fuel wetness.
Monitor rail pressure – Using live data, verify that actual rail pressure tracks within ±20 bar of specified value across all RPM ranges. Perform a road test under load.
💡 Pro Tip – The HP4 pump’s SCV is a common wear item. If you experience intermittent power loss or hard hot starts before replacing the pump, try replacing the SCV first. Always drain the water separator daily – water is the number one enemy of Denso HP4 pumps.
4. Why Choose Rsolid Engine Parts as Your Supplier
✅ Exact Denso / Mitsubishi Compatibility – Direct replacement for 294050-0054 / ME306387 in FK, FM, FH trucks with 6M60T engine.
✅ 100% Calibration Tested – Each pump is run on a Denso or Bosch EPS 200 test bench to verify delivery volume, rail pressure stability (2,000 bar), SCV response, and leak‑free operation. Test reports available.
✅ 12‑Month Warranty – Full coverage against manufacturing defects, even for high‑mileage fleet use.
✅ Competitive Fleet & Workshop Pricing – Volume discounts for transport companies, truck repair shops, and parts distributors.
✅ Fast Worldwide Shipping – Stock ready to ship to Asia, Europe, Africa, the Middle East, and the Americas.
✅ Expert Technical Support – Our diesel injection specialists provide pre‑purchase fitment verification, diagnostic assistance, and step‑by‑step installation guidance via WhatsApp or email.
Contact Rsolid Engine Parts Today
📞 WhatsApp: +8615975376778
📧 Email: amy@rinjector.com
