Fleece Performance Coolant Bypass® (FPE-CLNTBYPS-CUMMINS-1318) for 2013-2018 Cummins 6.7L
$398.99
The Fleece Performance Coolant Bypass® (FPE-CLNTBYPS-CUMMINS-1318) is an aftermarket upgrade for 2013–2018 Cummins 6.7L engines. It improves coolant flow to the rear cylinders, reducing pressure and helping prevent head gasket failure under stress. Designed for durability and better thermal control, it enhances engine longevity and includes all necessary parts for easy installation—making it a favored option for performance and reliability among diesel truck owners.
The Fleece Performance Coolant Bypass® (FPE-CLNTBYPS-CUMMINS-1318) is a high-quality aftermarket upgrade designed specifically for 2013–2018 Cummins 6.7L engines. This coolant bypass kit addresses a common issue with uneven coolant flow in the rear cylinders, helping to reduce coolant pressure and prevent head gasket failures under high-stress conditions. Engineered for durability and efficiency, the kit provides a secondary coolant path, allowing for better thermal control and improved engine longevity. It comes complete with all necessary hardware and fittings for a straightforward installation, making it a popular choice among performance diesel enthusiasts and those seeking enhanced reliability in their Cummins-powered trucks.
| Weight | 8 lbs |
|---|---|
| Dimensions | 16 × 13 × 3 in |
Fitment
- 2013 Ram 2500/3500 6.7L 24V Cummins
- 2014 Ram 2500/3500 6.7L 24V Cummins
- 2015 Ram 2500/3500 6.7L 24V Cummins
- 2016 Ram 2500/3500 6.7L 24V Cummins
- 2017 Ram 2500/3500 6.7L 24V Cummins
- 2018 Ram 2500/3500 6.7L 24V Cummins
Features
Increased Coolant Flow, Decreased Coolant Temperatures
The rear cylinders on the 6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders.
Benefits
- Lowers coolant temperature at the rear cylinders
- Ensures consistent temperatures across all cylinders
- Prevents damaging coolant pressure build up
- Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation.
Why do I need a Fleece Performance Coolant Bypass?
One of the biggest issues on the 6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition. The Fleece Performance Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform.
*Protected under US Patent D1037317 and US Trademark Reg. No. 6099979, 6099980, 6099981 and 7659022.
Installation
Includes
- Rear coolant bypass thermostat housing
- Front coolant bypass thermostat housing
- New EGR cross-over tube gaskets
- Black braided nylon coolant bypass hose with protective high temperature sleeve and AN fittings
- Mounting hardware
Warning
For model years 2007 – 2018 6.7L trucks, including both automatic and manual equipped transmissions, factory installed transmission fluid heat exchangers are uncommon but can be found in northern climates. For customers with a 6.7L that has a factory installed heat exchanger, an additional heater tube is required and can be purchased at your local Chrysler Dealership [PN:68048997AA] to complete the installation.
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