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It depends on where they're leaking. The T fittings for the return lines have O rings. Also the return lines can leak. If they're leaking into the cylinder then it could be time for new ones.
Sounds like the o-rings for the return lines are shot. Common problem and easy to fix. Do a search for 'return line' and you'll get all the info you need.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
