How to Replace the Fuel Cap on a 2016 GMC Savana 2500 (Fix EVAP Leak & Check Engine Light)
Step-by-step fuel cap replacement with safety tips, required tools/parts, and what to do if the CEL stays on for 2012, 2013, 2014, 2015, 2016, 2017
How to Replace the Fuel Cap on a 2016 GMC Savana 2500 (Fix EVAP Leak & Check Engine Light)
Step-by-step fuel cap replacement with safety tips, required tools/parts, and what to do if the CEL stays on for 2012, 2013, 2014, 2015, 2016, 2017
đź”§ Savana - Fuel Cap Replacement
Replacing the fuel cap is a quick job that helps prevent fuel vapors from escaping and can prevent an EVAP leak issue (often seen as a check engine light). On your Savana, it’s a simple remove-and-replace part with no special programming.
Difficulty Level: Beginner | Estimated Time: 0.1-0.2 hours
⚠️ Safety & Precautions
- ⚠️ Work outside or in a well-ventilated area—fuel vapors are flammable.
- ⚠️ No smoking, flames, or hot work near the fuel door.
- ⚠️ Turn the engine off and remove the key before starting.
- ⚠️ If the van was just driven, let it cool a few minutes before opening the fuel system.
- ⚠️ Battery disconnect is not required for this repair.
đź”§ Required Tools
You'll need the following tools for this repair:
- Nitrile gloves
- Shop towel
- Flashlight
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Fuel cap (OEM-style, tethered if equipped) - Qty: 1
đź“‹ Before You Begin
- Park on level ground, shift to Park, and set the parking brake.
- Make sure the engine is off and the key is removed.
- Wipe dirt away from the filler area using a shop towel so debris doesn’t fall into the tank.
🔨 Step-by-Step Instructions
Follow these steps in order:
Step 1: Open the fuel door
- Use a flashlight if needed to clearly see the filler neck area.
Step 2: Remove the old fuel cap
- Put on nitrile gloves.
- Turn the cap counterclockwise by hand until it comes off.
- If your cap has a tether (a small strap that keeps the cap attached), gently unhook it from the filler door area if needed.
- Tip: If it’s stuck, wiggle while turning.
Step 3: Inspect and clean the sealing surface
- Use a shop towel to wipe the filler neck sealing surface clean.
- Check for cracks, missing rubber seal, or dirt buildup on the old cap—these commonly cause EVAP leaks.
- Tip: Clean sealing surfaces prevent false leak codes.
Step 4: Install the new fuel cap
- Align the new cap and thread it on by hand (clockwise).
- Tighten until it clicks (typically 1–3 clicks). “Clicking” is the built-in clutch that ensures proper tightness.
- Do not use tools to tighten the cap.
Step 5: Close the fuel door
- Close the fuel door firmly by hand.
âś… After Repair
- Start the engine and confirm there’s no fuel smell around the filler area.
- If you had a check engine light for an EVAP leak, it may take a few normal drive cycles to turn off on its own after replacing the cap.
- If the light stays on, the issue could be another EVAP leak (hose, purge valve, vent valve), not the cap.
đź’° DIY vs Shop Cost
Shop Cost: $25-$80 (parts + labor)
DIY Cost: $10-$35 (parts only)
You Save: $15-$45 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.1-0.2 hours.
🎯 Ready to get started?
HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.
















