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FLOW DIAGRAMCURRENT · v1.0.0DIAG-FUEL-3STAGE

3-Stage Diesel Fuel Filtration System for HPCR Engines

Documents the multi-stage filtration architecture required by high-pressure common rail (HPCR) diesel fuel systems. HPCR injection pressures up to 2000 bar reduce injector nozzle clearances to 2–4µm, making fuel cleanliness critical. Stage 1 removes coarse debris protecting the lift pump. Stage 2 removes medium particles and free water (measured per ASTM D6304 Karl Fischer method) which causes injector stiction. Stage 3 provides final protection at ≥2µm before the high-pressure pump.

3-Stage Diesel Fuel Filtration SystemSequential three-stage diesel fuel filtration: Stage 1 pre-filter removes coarse particles (≥200µm), Stage 2 primary filter with water coalescing separator removes particles (≥10µm) and free water, Stage 3 secondary fine filter (≥2µm) protects HPCR injection pump and injectors. Return flow from injectors goes back to the fuel tank. Based on ISO 16332 and ASTM D6304.FUEL TANKSTAGE 1PRE-FILTER≥200µmwater drainSTAGE 2PRIMARY + WATER SEP.≥10µm · coalescinglift pumpSTAGE 3SECONDARY FINE≥2µm · HPCR gradeHPCRPUMPINJECTORS── return flow (excess fuel) ──2000 barISO 16332 · ASTM D6304
Left to right flow: fuel tank with yellow fill, Stage 1 pre-filter (coarse strainer ≥200µm, coarse particles shown caught inside), Stage 2 primary filter with water separator (≥10µm, water droplets draining downward, blue drain arrow), lift pump circle, Stage 3 secondary fine filter (≥2µm, green outline), HPCR pump box at 2000 bar, injector nozzles (three triangles in vertical stack), fuel return line in yellow dashed arrow going back to tank.

GOVERNING STANDARDS

ISO 16332
ASTM D6304
ISO 12937

ELIMFILTERS TECHNOLOGIES

SYNTEPORE™
HYDROCORE™
TURBOCORE™

APPLICABLE SYSTEMS

Fuel Cleanliness Protection

REVISION METADATA

Versionv1.0.0
Statuscurrent
Last Reviewed2026-07-08
Next Review2027-07-08

RELATED ENGINEERING ARTICLES

→Diesel Fuel Filtration
→Hpcr Fuel System Cleanliness
→Water Contamination Fuel
→Marine Diesel Filtration

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