Fuel Filter Water Separator for 500FG 500FH - Marine Diesel Protection

In this review of the Fuel Filter/Water Separator for 500FG 500FH marine diesel systems, the bottom line is simple: it is a practical, budget-friendly replacement for boatowners who need reliable water removal and multi-stage particle filtration. Designed to handle up to 60 Gph (227 Lph) and with selectable filter ratings, this unit is best for routine fuel polishing and maintenance on small to mid-size diesel boats. The reviewer found it performs the essential job of separating water from diesel and trapping contaminants without the premium price of some branded housings.

Key Features

• Fuel flow capacity: The 60 Gph (227 Lph) maximum flow rate lets owners maintain adequate fuel delivery for many single-engine marine installations without flow restriction concerns.
• Multi-grade filtration: The included 2, 10, and 30 micron filter options provide flexibility to trap coarse debris during routine polishing and finer particles when needed for cleaner fuel.
• Water detection ring: The red ring sinks in diesel but floats on water, giving a simple visual cue when water has collected and the bowl needs draining.
• Standard port size: The M141.5 port/connection size matches common fittings for many aftermarket setups, simplifying installation when plumbing aligns.
• Pressure rating: The 15 Psi (1.03 Bar) maximum pressure is suitable for gravity-fed and low-pressure pump systems typical on small craft, keeping operation safe under normal conditions.
• Single-unit package: Supplied as one complete fuel water separator, it is ready for direct swap-in or use in a fuel polishing loop without additional parts.

Who It's For

This unit is aimed at boatowners and DIY technicians who want an affordable, functional fuel filter/water separator for diesel polishing and routine maintenance on small to medium vessels. It suits those who value simple visual water detection and the option to use filters with different micron ratings depending on fuel condition.

It is less appropriate for operators who require higher-pressure-rated housings, nonstandard thread sizes, or turn-key compatibility with a specific branded filter family. Customers with uncertain thread tolerances or who need factory-matched bolt and thread specs should verify fitment before purchase.

Pros & Cons

Pros

• Solid basic performance for water separation and particle filtration during fuel polishing jobs.
• Multiple filter ratings included let users balance flow with filtration as needed.
• Clear visual water indication via the red ring simplifies maintenance checks.
• Good value compared with higher-priced branded housings with similar function.

Cons

• Some customers report compatibility and thread size issues, so fitment is not guaranteed for every system.
• The 15 Psi max pressure limits use on higher-pressure diesel systems or some pressurized supply setups.

Specifications

Product type	Fuel Filter / Water Separator
Compatible models	500FG, 500FH
Maximum flow rate	60 Gph (227 Lph)
Filter ratings	2, 10, and 30 micron
Port/connection size	M141.5
Maximum pressure	15 Psi (1.03 Bar)
Package contents	One fuel water separator

Our Verdict

For boatowners who need a cost-conscious replacement or an addition to a fuel polishing setup, this fuel filter/water separator offers practical filtration and a useful visual water indicator at a competitive price. Verify the M141.5 thread and the 15 Psi limit against your rig before buying; when it fits, it delivers straightforward functionality and good value compared with pricier alternatives.

Frequently Asked Questions

Does it remove free water?
Yes, the housing separates free water from diesel and the red ring indicates when water has accumulated in the bowl.

What connection size is required?
The unit uses an M141.5 port/connection, so confirm hoses or adapters match this standard thread.

Can it handle high-pressure systems?
The maximum pressure is 15 Psi (1.03 Bar), so it is suitable for low-pressure and gravity-fed applications but not high-pressure diesel supply systems.