Description
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
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30 Micron Absolute Filtration — Captures harmful particles 30 microns and larger, including carbon, sand, rust, and metal debris
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Water Separation — Hydrophobic filter media separates emulsified water from fuel, preventing injector rust and microbial growth
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Multi-Fuel Compatible — Safe for diesel, gasoline, biodiesel (B5-B100), and blended fuels
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Spin-On Design — Tool-free replacement — spin off the old filter, spin on the new PL420 in minutes
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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:
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Injector Failure — Water displaces the lubricating film, causing injector tip erosion and seizure
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Fuel Pump Damage — High-pressure pumps rely on fuel for lubrication; water accelerates internal wear
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Microbial Growth (Diesel Bug) — Bacteria and fungi thrive at the fuel-water interface, producing corrosive acids
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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.
