PL420 Fuel Water Separator Filter — 30 Micron Spin-On Protection
The PL420 Fuel Water Separator Filter is a high-efficiency spin-on filter designed to remove water, rust, sand, dirt, and metal particles from diesel, gasoline, and biodiesel fuel systems. Built for standard 420-series filter housings, this water separator protects your engine's fuel pump, injectors, and combustion chamber from contamination damage.
Key Features
30 Micron Absolute Filtration — Captures harmful particles 30 microns and larger, including carbon, sand, rust, and metal debris
Water Separation — Hydrophobic filter media separates emulsified water from fuel, preventing injector rust and microbial growth
Multi-Fuel Compatible — Safe for diesel, gasoline, biodiesel (B5-B100), and blended fuels
Spin-On Design — Tool-free replacement — spin off the old filter, spin on the new PL420 in minutes
Universal 420-Series Fit — Fits standard engine fuel filter assembly 420 housings across multiple applications
Applications
Application
Equipment Types
Stationary Generators
Standby & prime power diesel generators
Agricultural
Tractors, harvesters, sprayers, irrigation pumps
Marine
Inboard, stern drive, auxiliary diesel engines
Automotive
Light truck and automotive diesel fuel systems
Industrial
Construction equipment, mining machinery, stationary engines
Biodiesel
Processing and storage equipment, transfer pumps
Technical Specifications
Specification
Value
Filter Type
Spin-On Fuel Water Separator
Micron Rating
30 Micron (Absolute)
Thread
Standard 420-Series
Fuel Compatibility
Diesel, Gasoline, Biodiesel B5-B100
Water Removal
95%+ Efficiency
Replacement Interval
Every 15,000 miles / 500 hours / 12 months
Part Number
PL420
Why Replace Your Fuel Water Separator Regularly?
Diesel and gasoline naturally accumulate water through condensation in storage tanks and vehicle fuel tanks. Water in fuel causes:
Injector Failure — Water displaces the lubricating film, causing injector tip erosion and seizure
Fuel Pump Damage — High-pressure pumps rely on fuel for lubrication; water accelerates internal wear
Microbial Growth (Diesel Bug) — Bacteria and fungi thrive at the fuel-water interface, producing corrosive acids
Filter Plugging — Rust particles from steel tanks clog filters and injectors downstream
Installation Guide
Shut off the engine and allow the fuel system to cool
Place a drain pan under the filter housing — some fuel will spill
Unscrew the old filter by hand or with a filter wrench
Clean the filter head mounting surface with a clean rag
Apply a thin film of clean diesel to the new filter's gasket
Spin on the new PL420 filter until the gasket contacts the base, then tighten an additional 3/4 turn
Prime the fuel system per your engine's manual before starting
Start the engine and check for leaks
FAQ
Q: How often should I replace my PL420 fuel water separator?A: Replace every 15,000 miles, 500 engine hours, or every 12 months — whichever comes first. Replace more frequently in dusty conditions or when running biodiesel blends above B20.
Q: Does this filter work with biodiesel?A: Yes — the filter media handles biodiesel blends up to B100. However, biodiesel's solvent properties mean we recommend more frequent replacement.
Q: Will this fit my engine?A: If your engine uses a standard 420-series spin-on filter housing, this PL420 fits. Check your current filter part number — if it shows PL420 or equivalent cross-reference, this is your replacement.
Q: 30 micron vs 10 micron — which do I need?A: 30 micron is ideal as a primary water-separating filter — it removes bulk water and larger debris without restricting fuel flow. For final filtration before injection, a secondary 2-10 micron filter downstream provides fine-particle protection.
Q: How do I know when the filter needs replacing?A: Signs include hard starting, rough idle, loss of power under load, or visible water in the separator bowl. A vacuum gauge on the filter head is the most reliable indicator — replace at 10 inHg or per manufacturer spec.
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