Forklift Water oil separator

Forklift Water Oil Separator: Fuel Filtration — FS1242, XR708, 4D32XG30-24200, CL0002622, CL0005811, YM129901 Sensor, DX200-C240, 7 Product Lines

The water oil separator — also called fuel water separator, diesel water trap, or coalescing filter — is the fuel filtration component installed in the fuel line between the diesel tank and the engine injection pump. Its dual function is to filter out solid particulate contaminants (dirt, rust, scale from steel fuel tanks and storage containers) and to separate water from diesel fuel through a settling chamber or coalescing element. Water is the single most damaging contaminant in diesel fuel because it has zero lubricity — the injection pump plunger-and-barrel assemblies and injector nozzle tips rely on the fuel itself as a lubricant, operating at clearances measured in microns. Water displaces the fuel film on these surfaces, causing metal-to-metal contact that scores and seizes the precision components within hours. A failed separator that allows water past the filter element into the injection pump can destroy a $2,000-5,000 injection pump in a single operating shift. Water also supports microbial growth (diesel bug) in the fuel tank, which produces acidic byproducts that corrode metal fuel system components and slime that clogs filters. The water separator works by density difference — water (specific gravity 1.0) sinks to the bottom of the separator bowl because it is heavier than diesel fuel (specific gravity approximately 0.85), while the clean fuel flows upward through the filter element. The accumulated water is drained manually through a petcock valve at the bottom of the separator. A water separator sensor (typically a conductivity probe) detects when the water level reaches the probe tips and illuminates the dashboard warning light — a failed sensor that never warns allows water to accumulate until it overflows into the fuel system.

Kingstream supplies 7 water oil separator product lines covering universal diesel filters, engine-specific separators (Xinchai 4D32, 4D94E/S4S, Isuzu C240, Nissan), heavy forklift assemblies (CPCD100), and replacement sensors.

Universal Fuel Water Separators:
• FS1242 (YFL, 93×174mm) — Spin-on fuel water separator for forklifts, excavators, and trucks. 93mm diameter × 174mm height, 1.6kg. Coarse filter function. Hebei. Standard form factor compatible with multiple diesel engine brands
• DX200-C240 (8-94369-299-3) — Isuzu C240 engine diesel filter water separator. OEM part reference for one of the most widely used industrial diesel engines. Direct fit for C240-powered forklifts and equipment

Engine-Specific Separators:
• XR708-341000-G00 (HELI, Hangcha, EP) — Oil water separator for HELI, Hangcha, and EP forklift diesel engines. Steel and paper construction. Genuine part. MOQ 1. Carton packing from Shanghai
• 4D32XG30-24200 (Xinchai, 100% Original) — Xinchai 4D32G engine oil-water separator covering HELI, Hangcha, JAC, TCM, Tailift, and Liugong forklifts. 1kg. 1-year warranty. Chongqing. Fits the Xinchai 4D32 engine family used in 2-3.5T Chinese forklifts
• CL0005811 (Nissan Engine) — Oil water separator for Nissan diesel engine forklifts. Factory direct replacement. Verify fuel line fitting sizes before installation (Nissan may use metric or JIS fittings)

Heavy Forklift Assembly:
• CL0002622 (CPCD100-QC3K) — Complete engine oil water separator assembly for CPCD100 10-ton heavy forklifts. Reference 4J1-5410541560000. Includes housing, mounting bracket, and all connections. For the largest class of heavy forklift diesel engines where injection pressures exceed 1,000 bar

Sensors:
• YM129901-55820 (4D94E/S4S, Hanzhi) — Water separator sensor for 4D94E and S4S diesel engines. Plastic/metal construction, 0.35kg. Conductivity probe type — detects water accumulation and triggers dashboard warning light. 100% professional tested

When to Service Water Separators:
• Water-in-fuel warning light illuminated on dashboard → Stop the forklift immediately. Drain the water separator bowl. If the light does not extinguish after draining, the sensor may be faulty. Replace the sensor if the problem persists
• Drain the water separator at every engine oil change (monthly minimum for high-usage forklifts) → Regular draining prevents water accumulation that rises to the filter element level. If water is consistently present, the fuel storage tank may have water contamination — drain and clean the fuel tank
• Water separator filter element has reached its service interval (typically 500 hours or annually) → Replace the filter element or the complete separator assembly if it is a spin-on type. A clogged or saturated filter element restricts fuel flow, causing hard starting, power loss, and increased injection pump wear from cavitation
• Visible rust, scale, or sediment in the drained fuel from the separator → The fuel tank or fuel storage system has contamination. Clean the fuel tank, replace all fuel filters, and flush the fuel lines before installing a new separator
• Sensor connector is corroded or the sensor body is cracked → Replace the sensor. Corroded connectors create high resistance that causes false water warnings. Apply dielectric grease to the connector after installation

OEM Cross-Reference:

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Compatible: Xinchai 4D32G/4D94E/S4S, Isuzu C240, Nissan, HELI, Hangcha, CPCD100. Browse our maintenance parts catalog.