Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Leak Testing
If a fuel system leak is suspected, inspect system tubing with a commercially available liquid leak detector. Ensure fuel system is fully pressurized. Apply a generous amount of leak detector fluid to suspected leak area. Monitor area for 3-5 minutes. A steady source of bubbles should appear at leak area. Repair as needed. See SYSTEM/COMPONENT TESTS - 5.2L CNG article in the ENGINE PERFORMANCE section. If fuel cylinder leak is suspected, cylinder must be replaced.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.