How to Replace the In-Tank Fuel Pump Module on a 2018 GMC Terrain
Step-by-step fuel pump replacement with safety tips, required tools/parts, and post-install priming checks
How to Replace the In-Tank Fuel Pump Module on a 2018 GMC Terrain
Step-by-step fuel pump replacement with safety tips, required tools/parts, and post-install priming checks
🔧 Terrain - Fuel Pump Replacement
On your Terrain, the fuel pump is part of an in-tank fuel pump module. Replacement usually requires relieving fuel pressure, disconnecting the fuel lines and wiring, then removing the module either through an interior service opening (if equipped) or by lowering the fuel tank.
Difficulty Level: Advanced | Estimated Time: 2.5-5.0 hours
⚠️ Safety & Precautions
- ⚠️ Work outside or in a well-ventilated area; fuel vapors are highly flammable.
- ⚠️ No smoking, sparks, hot lights, or grinding anywhere nearby.
- ⚠️ Relieve fuel pressure before disconnecting any fuel line to prevent spray.
- ⚠️ Disconnect the negative battery cable before unplugging the fuel pump wiring.
- ⚠️ Support the vehicle with jack stands; never rely on a jack alone.
- ⚠️ Keep a Class B fire extinguisher within reach.
🔧 Required Tools
You'll need the following tools for this repair:
- Safety glasses
- Nitrile gloves
- Class B fire extinguisher
- Floor jack (rated 3-ton minimum)
- Jack stands (rated 3-ton minimum)
- Wheel chocks
- Metric socket set (8mm-18mm)
- 3/8" drive ratchet
- 3/8" drive extensions (3" and 6")
- Torque wrench (10-200 Nm range)
- Trim removal tool set
- Flathead screwdriver
- Fuel line quick-disconnect tool set
- Brass drift punch
- Dead-blow hammer
- Fuel pump lock ring tool (specialty)
- Shop rags
- Drain pan
- Transmission jack (specialty)
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Fuel pump module assembly (in-tank) - Qty: 1
- Fuel pump module seal O-ring - Qty: 1
- Fuel line retaining clips (as needed) - Qty: 1
📋 Before You Begin
- Park on level ground, set the parking brake, and chock the rear wheels.
- Plan to work with a low fuel level (under 1/4 tank) to reduce weight and spilling.
- Answer these so I can give you the exact, trim-correct procedure and torque specs:
- ❓ Is your Terrain FWD or AWD?
- ❓ Are you trying to replace the in-tank fuel pump module (not the high-pressure fuel pump on the engine)?
🔨 Step-by-Step Instructions
Follow these steps in order:
Once you reply to the 2 questions above, I’ll provide the exact step sequence for your Terrain (including whether it’s a tank-drop job, and the correct torque specs and line routing).
✅ After Repair
- Cycle the ignition ON for 5 seconds, then OFF, 3 times to prime the system before cranking.
- Start the engine and check carefully for fuel leaks at every line connection.
- Clear any stored codes and verify fuel pressure/trim values if you have a scan tool.
💰 DIY vs Shop Cost
Shop Cost: $900-$1,800 (parts + labor)
DIY Cost: $300-$900 (parts only)
You Save: $600-$900 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2.5-5.0 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.
