Description
Upgrade Your Cracked OEM Cap: 68157291AA Filter + Billet Aluminum Housing Cap (Black)
If you own a 2011–2020 Ram 6.7L Cummins, you've probably heard the horror story: a cracked factory fuel filter cap lets air into the system, causes hard starts, throws P0087 low fuel pressure codes, and in worst cases, starves the CP4 pump of fuel — a $10,000 repair. The OEM 68065612AA plastic cap is the weak link. Heat cycling, over-tightening, and years of vibration make them brittle until they crack — usually right after a filter change when you least expect it.
The iFJF combo kit solves two problems in one purchase: a 5-micron 68157291AA filter and a CNC-machined billet aluminum cap in anodized black. Replace the filter. Replace the cap. Never worry about a cracked housing lid again.
Vehicle Fitment
| Year |
Make |
Model |
Engine |
| 2011–2020 |
Ram |
2500 / 3500 |
6.7L Cummins Turbo Diesel |
| 2011–2020 |
Ram |
4500 / 5500 |
6.7L Cummins Turbo Diesel |
Fits the front (underhood) fuel filter housing on all 2011–2020 Ram 6.7L Cummins trucks. Replaces Mopar cap 68065612AA.
Why Replace the OEM Plastic Cap?
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🔩 Common Failure Point — Do a quick search on any Ram Cummins forum and you'll find hundreds of threads about cracked filter caps. The OEM cap is thin-walled injection-molded plastic that degrades with every heat cycle and cracks when over-torqued even slightly.
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💨 Air Intrusion = Fuel Starvation — A cracked cap doesn't just leak diesel — it lets air into the fuel system. Air in a common-rail diesel means hard starts, rough idle, limp mode, and in extreme cases, CP4 pump cavitation and failure.
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🔧 One-and-Done Upgrade — The iFJF billet aluminum cap is CNC-machined from a solid block of 6061-T6 aluminum and hard-anodized black. It will never crack, never strip, and never deform — even under the heat of a working 6.7L.
Key Features
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✅ 68157291AA 5-Micron Filter — Dual-layer synthetic media captures particles down to 5 microns and separates emulsified water. Same performance as the Mopar filter at a fraction of the cost.
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✅ CNC Billet Aluminum Cap — Black Anodized — Precision-machined from 6061-T6 aluminum billet, not cast or forged. Threads are single-point cut to exact OEM pitch for a perfect seal. Black hard-anodized finish resists corrosion, diesel, and underhood chemicals.
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✅ Hex-Head Tool Interface — Unlike the OEM plastic hex (which rounds off), the aluminum cap accepts a standard 28mm or 1-1/8" socket with zero risk of stripping. Torque to spec every time.
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✅ Complete Kit — Filter, cap, and O-ring in one box. No separate orders, no missing parts.
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✅ IATF 16949 Certified Manufacturing — Filter is produced in our certified facility; cap is machined to ISO 2768-m tight tolerances.
OEM Part Number Cross-Reference
| Part Number |
Brand |
Component |
| 68157291AA |
Mopar |
Fuel Filter Element |
| 68065608AA |
Mopar |
Fuel Filter (superseded) |
| 68065612AA |
Mopar |
Fuel Filter Housing Cap (replaced by this aluminum cap) |
| MO608 / MO291 |
Mopar |
Service Kit |
| FS43255 / FS53000 |
Fleetguard |
Fuel Filter |
| PF9870 |
ACDelco |
Fuel Filter |
| 33255 |
WIX |
Fuel Filter |
| FF1199 |
Baldwin |
Fuel Filter |
Installation
- Locate the fuel filter housing on the driver-side of the engine bay (front position)
- Place a rag under the housing to catch any diesel drips
- Use a 28mm or 1-1/8" socket to remove the old plastic cap
- Pull out the old filter element
- Lubricate the new O-ring with clean diesel fuel and install it on the new aluminum cap
- Insert the new filter element into the housing
- Thread the new aluminum cap by hand until seated, then torque to 18 ft-lbs
- Cycle the key to RUN (without starting) 3–5 times to prime the system
- Start the engine and check for leaks
⚠️ Important: Do not over-torque! The aluminum cap is far stronger than the plastic housing threads. Tighten to 18 ft-lbs (25 Nm) — no more. A torque wrench is strongly recommended.
Frequently Asked Questions
Q: Will this cap fix my P0087 / P0234 codes?
A: If your codes are caused by air intrusion through a cracked or leaking OEM plastic cap, yes — replacing the cap with our billet aluminum version will seal the system and eliminate those symptoms. If the codes persist after replacement, check the fuel lines, lift pump, and injectors.
Q: Is this the front or rear filter?
A: This is the front (underhood) filter and cap. The rear filter on 2011–2020 trucks uses the 68157291AA element in a different housing on the frame rail. The aluminum cap is specific to the front position.
Q: Can I use a socket on the aluminum cap?
A: Yes! That's one of the biggest upgrades over the plastic cap. The hex is precision-machined for a perfect socket fit — no more rounded-off plastic hex when the cap is stuck.
Q: Will the black anodizing fade or peel?
A: No. The hard anodizing is an electrochemical process that converts the aluminum surface into aluminum oxide — it's not a paint or coating. It will not peel, flake, or fade under normal underhood conditions.
Q: Does the aluminum cap affect fuel temperature?
A: Aluminum conducts heat slightly more than plastic, but in practice, this has no measurable effect on fuel temperature. The cap is not in direct contact with the hottest engine components, and diesel fuel circulates through the system constantly.
🛠️ Complete Your Ram 6.7L Fuel System Service
Need more than just this part? These products are designed to work together:
