Description
Overview
The Sierra inline fuel filter 18-7857-1 protects petrol fuel systems by intercepting debris before it reaches the engine. Its compact body fits 3/8″ (≈ 9.5 mm) fuel hoses. Because it cross-references GF-61P, Fram G15/G3, and Wix 33003, it offers broad compatibility. Use it to maintain clean fuel and preserve engine performance.
Features
- Compact inline form ideal for under-cowl or rigid hose runs
- Filtration down to ~21 microns (official spec) to trap fine particles
- Compatible with A.C. Delco GF-61P, Fram G15/G3, and Wix 33003
- Steel housing built for marine and fuel-system environments
Specifications and Materials
| Part Number | 18-7857-1 |
| Fuel Line Size | 3/8″ / ~9.5 mm |
| Filtration Rating | 21 microns |
| Housing Material | Steel (natural finish) |
| Cross References | A.C. Delco GF-61P, Fram G15/G3, Wix 33003 |
For general principles of fuel filter media and operation, see the Fuel Filter article.
Compatibility and Fitment
This filter suits petrol engines using 3/8″ fuel hose. Since it matches GF-61P, Fram G15/G3, and Wix 33003, many systems accept it as a drop-in replacement. Always verify your engine manual or OEM part list before installation. Ensure correct flow orientation and secure hose clamps.
Compliance and Safety
Begin by relieving fuel system pressure before removal. Examine hoses and clamps; replace worn parts. After installing, test the system for leaks at operating pressure. Replace regularly to avoid blockages and ensure fuel delivery under all conditions.
Marine Applications
Marine fuel often carries water, sediment, and corrosion byproducts. This Sierra inline filter offers a compact and reliable barrier to protect injectors, carburettors, and pumps. Install it near the engine or under cowl. Carry a spare aboard for maintenance in the field.
Why Choose Argomarine
Argomarine focuses on providing reliable, well-documented marine parts with clarity in fitment, cross references, and technical details. We help you service your vessel with confidence. See more OEM and aftermarket parts in our Engine and Service Parts category.
