Racor 120AS Fuel/Water Separator Filter – Diesel & Gas | 2 Micron | 15 GPH

Racor 120AS Fuel/Water Separator Filter – Diesel & Gas | 2 Micron | 15 GPH

Part Number: 120AS (distributor SKU: 62-120AS)
Brand: Racor
Series: Racor 100 Series
Type: Fuel filter / water separator assembly with spin-on Aquabloc® II element
Filtration: 2 micron
Fuel compatibility: Diesel and gasoline

Product Overview

The Racor 120AS is a compact fuel filter/water separator assembly from Racor’s 100 Series, designed to remove water and solid contamination from diesel and gasoline fuel systems before fuel reaches the engine. Unlike the 110A cartridge-style model, the 120AS uses a spin-on Aquabloc® II replaceable element and features a clear spin-on bowl that allows water and contamination levels to be checked at a glance without disassembling the unit. The bowl is UV-stabilized and will not discolor from alcohol, fuel additives, or sunlight exposure, and features a positive-seal drain for easy water removal during servicing.

• Filtration rating: 2 micron (Aquabloc® II spin-on element)
• Maximum flow: 15 GPH / 57 LPH diesel; 35 GPH / 132 LPH gasoline
• Fuel ports: 1/4"-18 NPTF female (inlet and outlet)
• Maximum allowable pressure: 70 PSI / 4.8 bar
• Clear spin-on bowl: water and contamination visible at a glance
• Bowl drain: positive-seal, leak-proof drain for easy servicing
• UV-stable clear bowl: will not discolor from alcohol, additives, or UV light
• Metal housing with unitized mounting bracket
• Suitable for diesel and gasoline fuel systems

Compatible Applications

• Compact marine diesel and gasoline engines where 2-micron filtration and low flow rate are appropriate
• Marine generator sets and auxiliary engines with 1/4" NPTF fuel ports and flow requirements within 120AS specifications
• Pressure washers and small equipment diesel or gasoline engines requiring compact fuel/water separation
• Any fuel system requiring 1/4"-18 NPTF connections, max 70 PSI, and 15 GPH (diesel) or 35 GPH (gasoline) flow or less

Selection Note: Confirm the engine manufacturer’s required filtration level, maximum fuel-flow demand, port size, and allowable system pressure before installation. For 10-micron filtration or higher pressure applications, see the Racor 110A (10 Micron, 100 PSI).

Part Number Reference

• Racor assembly: 120AS
• Distributor SKU: 62-120AS
• Spin-on replacement element (2 micron): R12T
• 10-micron version: Racor 110A

Service Interval

Replace the spin-on filter element at the interval specified by the engine or fuel-system manufacturer — typically every 100–200 hours or at annual service, whichever comes first. Service more frequently in poor fuel-quality conditions, contaminated fuel supplies, or extended operating seasons. Inspect the clear bowl at each use for visible water or debris accumulation.

When to Service

• Engine manufacturer’s scheduled service interval is reached
• Visible water or heavy debris accumulation in the clear bowl
• Increased fuel restriction or engine fuel-starvation symptoms
• Contamination found during routine inspection
• After operating in contaminated or low-quality fuel conditions

Installation Notes

• Mount the unit securely with the bowl oriented downward to allow water to collect at the drain
• Provide adequate clearance below the bowl for spin-on element replacement and bowl drainage during service
• Use compatible fuel fittings and approved thread sealant on the 1/4"-18 NPTF port connections
• Prime the filter with clean fuel before starting the engine to avoid air in the fuel system
• Inspect all connections for leaks before returning the vessel or equipment to service

Technical FAQ

What is the replacement element for the 120AS? The 120AS uses a spin-on Aquabloc® II element. The 2-micron spin-on element is R12T. Always confirm the correct element for your specific model before ordering.

What is the difference between the 120AS and the 110A? The 110A uses a cartridge-style element (R11T, 10-micron only) and is rated to 100 PSI. The 120AS uses a spin-on element with a clear visual bowl and is rated to 70 PSI. The 120AS provides finer 2-micron filtration. See the Racor 110A for the 10-micron, 100 PSI version.

Can the 120AS be used on fuel-injected engines? Confirm with the engine manufacturer. The 120AS is rated to 70 PSI maximum — higher-pressure fuel-injected systems may require the 110A or a Racor turbine-series filter rated for higher pressure.

Can I see water accumulation without disassembling the filter? Yes — the clear spin-on bowl allows direct visual inspection of water and contamination levels without any disassembly.

Related Products

• Racor 110A Fuel/Water Separator Filter – Gas & Diesel | 10 Micron
• Racor Replacement Element for Gas Spin-On Fuel/Water Separators
• Racor 500 Turbine Series Replacement Filter Element – 2010TM-OR 10 Micron
• Racor 2020V10 Replacement Fuel Filter Element – 10 Micron
• Racor 2020V2 Replacement Fuel Filter Element – 2 Micron
• Sierra 18-7919 Fuel/Water Separator Element – 10 Micron

Parts Desk Insights

The key distinction between the 120AS and the 110A is filtration micron rating and pressure rating: the 120AS filters at 2 microns (finer) but is limited to 70 PSI, while the 110A is 10 micron and rated to 100 PSI. The most common customer error is selecting the wrong Racor 100 Series model without checking the engine’s pressure rating — particularly for fuel-injected engines that may exceed the 120AS’s 70 PSI limit. Always confirm the engine’s fuel system pressure before recommending the 120AS. Also note the 120AS spin-on element is R12T — not the same as the R11T used in the 110A — and confirm the correct element number with the customer at the time of sale.