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
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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 UF0155-000 Diesel Fuel Filter Water Separator Install: ABS Housing + Hand Pump for Truck & Marine Engines
Why Your Engine Needs a Real Fuel Water Separator Modern diesel fuel is garbage. Low-sulfur diesel absorbs water faster than the old stuff. Biodiesel blends...
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, by iFJF Direct Marine Fuel Water Separator Install: R12H Aluminum Housing vs Racor S3240 — Complete Guide for Boat Owners
Why You Should Care About Your Fuel Water Separator Water in boat fuel is not a maybe. It's a when. Condensation in the tank, a...
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, by iFJF Direct How to Convert Your Intex & Bestway Pool Hoses from 1-1/4" to 1-1/2": 4560 Kit Install in 20 Minutes
Why You'd Even Mess With This Here's the thing Intex and Bestway don't tell you when you buy that shiny new sand filter pump: the...
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, by iFJF Direct Marine Fuel Water Separator Buying Guide: R12H Aluminum vs Racor S3240 — Complete Comparison & Install Tips
Why Your Boat's Engine Is One Tank of Bad Fuel Away from Disaster Marine engines face a threat that automotive engines almost never encounter: water-saturated...
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, by iFJF Direct How to Convert 1-1/4" to 1-1/2" Pool Filter Hoses: 4560 Kit Installation for Intex & Bestway
Why Your Pool Pump Is Working Harder Than It Should If you own an Intex, Bestway, or Coleman above-ground pool, there's a good chance your...
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, by iFJF Direct R12T Fuel Filter Water Separator Kit - 120 AT NPT ZG1/4-19 with Fittings
🛒 Parts Used in This Guide 12642623 Fuel Filter Head + 1R-0750 Refit for 2005-2016 Dura $87.99 Shop Now → 1R-0750 Fuel Filter Aluminum Head...
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Browse All ProductsWhat Our Customers Say
4.9★ average from 3,200+ verified reviews — Real feedback from real customers
EGR Delete Kit — Duramax LBZ
★★★★★
Clean fit, immediate gains
"Installed on my 2007 Silverado Classic. Everything lined up perfectly. Noticeably better throttle response and about 2mpg improvement on the highway."
— Jay W.✓ Verified
Fuel Filter — Cat / Cummins
★★★★★
Fleet-tested, fleet-approved
"We run 12 trucks with Cummins ISX engines. Switched to iFJF filters 6 months ago. Zero fuel system issues since. The cost savings over Fleetguard are substantial."
— Truck Shop Dave✓ Verified
R12T Fuel Filter Water Separator
★★★★★
Best upgrade for my boat
"Excellent product, installed easily and does not leak. I can tell a huge difference in the way my outboard runs. The problems, missing and sputtering I thought were coming from water in the gas are completely gone. I would recommend this addition to anyone with a boat, no matter what size outboard."
— GG 1✓ Verified
R12T Fuel Filter Water Separator
★★★★★
Fast delivery.
"Great filter for the price."
— oscar haaland✓ Verified
DEF Pump Filter Kit
★★★★★
Fixed DEF warning instantly
"Was getting the 'DEF system service required' warning. Swapped this filter kit and cleared the codes — hasn't come back in 3 weeks."
— Tom P.✓ Verified
R12T Fuel Filter Water Separator
★★★★★
It works great
"It works great"
— Kevin Alexis✓ Verified