Factory-Direct Diesel Filtration for American Trucks, Boats & RVs
Save 30-50% vs Dealership — IATF 16949 Certified Manufacturer
- 🏭 20+ Years Manufacturing
- 📋 IATF 16949 Certified
- ⭐ 4.9★ on Amazon (3,200+ Reviews)
- 💰 Factory-Direct Pricing
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Why Choose iFJF Direct?
More than a store — we're the manufacturer.
Factory Direct
No middleman markup. We design, manufacture, and ship from our own facility. Since 2009.
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IATF 16949 & ISO 9001
Automotive-grade quality certified. Same standards trusted by global OEM manufacturers.
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4.9★ on Amazon
3,200+ verified reviews from diesel & RV owners who trust our quality and value.
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Shop by Engine
Find the right diesel filter for your truck — Duramax, Cummins, or Powerstroke
Duramax 6.6L
Chevrolet Silverado & GMC Sierra
2500HD/3500HD · 2001–2024
23 Products
2500HD/3500HD · 2001–2024
Cummins 6.7L
Ram 2500/3500 Heavy Duty
Pickup & Chassis Cab · 2007–2024
18 Products
Pickup & Chassis Cab · 2007–2024
Powerstroke
Ford F-250 to F-550 Super Duty
6.0 / 6.4 / 6.7L · 2003–2024
15 Products
6.0 / 6.4 / 6.7L · 2003–2024
Maintenance Guides & Tips
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, by iFJF Direct UF106 DEF Urea Filter: How to Replace It on DD13 & DD15 (Replaces 4388378)
UF106 DEF Urea Filter: What It Does, How to Replace It, and How It Prevents Derate If you've ever seen "DEF pressure low" or "conversion...
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, by iFJF Tech Team iFJF R12T Fuel Filter/Water Separator Install Guide (10 Mins)
iFJF R12T Fuel Filter/Water Separator Installation Guide The iFJF R12T Fuel Filter/Water Separator (120AT NPT ZG1/4-19) installs in about 10 minutes with basic hand tools...
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, by iFJF Direct LBZ or LMM - DSP 5 Switch - INSTALL & TROUBLESHOOTING
Home › News › How to Install a DSP 5 Switch on Your LBZ or LMM Duramax How to Install a DSP 5 Switch on...
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, by iFJF Direct RACOR SPIN-ON FUEL FILTER / WATER SEPARATOR R12T alternative m18 x 1.5
RACOR R12T Alternative Fuel Filter: The Complete Guide to Spin-On Diesel Fuel/Water Separators (M18 x 1.5 Thread) 🛒 Parts Used in This Guide 12642623 Fuel...
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, by iFJF Direct iFJF Bluetooth Kill Switch vs ISINFLASH vs Traditional Mechanical: Which Anti-Theft Solution Actually Stops Thieves in 2026?
iFJF Bluetooth Kill Switch vs ISINFLASH vs Traditional Mechanical: Which Anti-Theft Solution Actually Stops Thieves in 2026? Vehicle theft in the United States hit 1,020,729...
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, by iFJF Direct FASS vs AirDog Lift Pumps: Which Duramax Fuel System Upgrade Actually Saves Your CP4 in 2026?
FASS vs AirDog Lift Pumps: Which Duramax Fuel System Upgrade Actually Saves Your CP4 in 2026? If you own a 2001–2016 Chevy or GMC Duramax...
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Browse All ProductsWhat Our Customers Say
4.9★ average from 3,200+ verified reviews — Real feedback from real customers
R12T Fuel Filter Water Separator
★★★★★
It works great
"It works great"
— Kevin Alexis✓ Verified
R12T Fuel Filter Water Separator
★★★★★
Great Price.
"Was looking on ebay for this. But better price on Amazon. Amazon has everything you are looking for. Love It !"
— lisa✓ Verified
L5P Fuel Filter Kit
★★★★★
Saved $100 vs dealership
"Dealership quoted $180 for L5P fuel filter replacement. Bought this kit and did it myself in 30 minutes. For $40 you can't beat it."
— Jack W.✓ Verified
Marine Fuel Water Separator
★★★★★
Boating season essential
"Installed the R12H assembly on my 24' center console with a 250hp Yamaha. Clear bowl lets me see water contamination instantly. Way cheaper than the Yamaha branded unit."
— Captain Dan✓ Verified
Engine Oil Filter for Ram 3.0L
★★★★★
Good price
"I have used this product for quite some time. Works well and good price"
— M. C. Koch✓ Verified
R12T Fuel Filter Water Separator
★★★★★
Good quality product
"Fast shipping,easy to install"
— Elesio c.✓ Verified