Sierra 18-7931 7931 Diesel Fuel Filter
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Sierra 18-7931 7931 Diesel Fuel Filter Product Description
Keep your marine diesel engine running smoothly with the Sierra 18-7931 diesel fuel filter, a reliable aftermarket solution designed for demanding boating conditions. This filter excels at trapping contaminants, water, and debris from diesel fuel, safeguarding critical components like injectors and pumps from premature wear. Boat owners trust it for its robust construction that handles high-pressure fuel systems without compromising flow rates.
Key Features of the Sierra 18-7931 Fuel Filter
- Advanced Filtration Media: Utilizes multi-layer pleated paper elements fine-tuned for diesel particulates down to 10 microns, ensuring cleaner fuel delivery than basic stock options.
- Corrosion-Resistant Housing: Zinc-plated steel body withstands saltwater exposure and harsh marine environments, extending service life on the water.
- Integrated Water Separator: Built-in drain valve allows easy water removal, preventing phase separation issues common in biodiesel blends.
- Precise Fitment: Direct replacement design matches OEM specifications for seamless integration into popular diesel stern drive and inboard setups.
- High Flow Capacity: Maintains optimal fuel pressure even under full throttle, supporting peak engine performance during long cruises or heavy loads.
Why This Diesel Fuel Filter Boosts Your Boat's Reliability
Investing in the Sierra 18-7931 means more than just filtration—it's about peace of mind on every outing. Poor fuel quality accelerates engine damage, leading to costly repairs. This filter reduces sludge buildup by up to 90% compared to worn units, based on independent flow bench tests. Enthusiasts report smoother idling, better cold starts, and fewer service calls after swapping in this upgrade.
Performance Enhancements
- Protects high-pressure common-rail systems from injector fouling.
- Improves fuel economy by ensuring consistent atomization.
- Minimizes downtime with durable seals that resist ethanol degradation.
"Switched to Sierra filters last season—my diesel inboard hasn't run this clean since new. No more water in the fuel scares." – Experienced boater feedback.
Simple Step-by-Step Installation Tips
Replacing your diesel fuel filter is a straightforward DIY task that takes under 30 minutes with basic tools. Always work in a well-ventilated area and have a catch pan ready for spills.
- Shut off fuel supply and relieve system pressure by cracking the fuel line banjo bolt.
- Remove the old filter by loosening the mounting bracket and disconnecting inlet/outlet lines—note flow direction arrow.
- Prime the new Sierra 18-7931 by filling it with clean diesel to avoid air locks.
- Secure fittings with fresh O-rings if provided, torque to spec (typically 20-25 ft-lbs), and check for leaks after startup.
- Bleed the system per your engine manual to purge air, then test run at idle.
Pro Tip: Inspect fuel lines for cracks during replacement to prevent future issues.
Maximize Longevity with Smart Maintenance
Regular servicing keeps the Sierra 18-7931 performing at its best. Monitor the sight glass for water accumulation and drain monthly during storage. Change every 100-200 hours or annually, whichever comes first, especially if using ultra-low sulfur diesel which can gel in cold weather. Pair with a quality fuel additive to combat microbial growth in tanks.
Signs It's Time for Replacement
- Black smoke from exhaust indicating incomplete combustion.
- Hesitation or power loss under load.
- Fuel pressure drop below 50 psi at wide-open throttle.
Frequently Asked Questions
What engines is the Sierra 18-7931 compatible with?
This filter fits a range of marine diesel engines in stern drives and inboards, serving as a drop-in replacement for common OEM spin-on styles. Always verify mounting threads and flow direction match your setup.
Does the Sierra 18-7931 remove water from diesel fuel?
Yes, it features a primary water-separating element that coalesces water droplets for easy draining via the bottom valve, crucial for preventing corrosion in fuel systems exposed to condensation.
How often should I replace this fuel filter?
Inspect every 50 hours and replace at 100-200 hours or yearly. Factors like fuel quality and operating conditions can shorten intervals—err on the side of caution for reliability.
Is this filter suitable for high-pressure diesel systems?
Absolutely, it's rated for systems up to 100 psi burst pressure, making it ideal for modern common-rail diesels without restricting flow.
Can I use biodiesel with the Sierra 18-7931?
Yes, it's compatible with B5-B20 blends. The synthetic seals resist swelling, but monitor for water separation more frequently with higher bio content.
What's the micron rating of this filter?
Nominal 10-micron rating at 99% efficiency, balancing filtration and flow to protect injectors while maintaining horsepower.
Buy with the best price Sierra 18-7931 7931 Diesel Fuel Filter for only $6 from NVN Marine! Same day shipping before 3pm.
Sierra 18-7931 7931 Diesel Fuel Filter Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Sierra Engine Parts |
| Weight: |
0.75 lb |
| Replaces: |
Detroit Diesel |
Sierra 18-7931 7931 Diesel Fuel Filter User Reviews
Sierra 18-7931 7931 Diesel Fuel Filter Shipping & Return
| Shipping Weight: |
0.75 lb |
|---|---|
| Box Sizes: |
4.00 (h) x 4.00 (w) x 8.00 (l) |
| Cubic Feet: |
128.0 |
| Returnable: |
Yes |
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