Complete repair guide for the Airstream Rangeline – Diesel Heater Glow Plug & Fuel Pump Service. Follow these steps to diagnose and fix the issue yourself.
Parts & Tools You’ll Need
- Webasto / Espar ceramic glow plug
- Diesel heater fuel dosing pump (12V)
- Inline diesel fuel filter
- Diesel heater LCD control panel
- Combustion chamber blower motor
- Intake & exhaust silencer kit
- Diesel fuel line silicone tubing (4mm)
- Digital multimeter (auto-ranging)
Disclosure: This post contains affiliate links. We may earn a commission on qualifying purchases at no extra cost to you.
Step-by-Step Repair Guide
Step 1: Diagnose Heater Malfunction Safely
Before beginning any work, turn off your diesel heater and disconnect the negative battery terminal to prevent electrical hazards and accidental ignition. Use your digital multimeter to test the glow plug circuit for continuity and voltage, noting any readings below 12V that indicate a failed glow plug or fuel pump issue.
Step 2: Access Heater Components Beneath Van
Locate your Webasto or Espar diesel heater unit mounted under your Airstream Rangeline, typically positioned near the fresh water tank or engine compartment. Remove the access panel and disconnect the electrical connectors from the glow plug and fuel dosing pump, taking photos of wire positions for reassembly reference.
Step 3: Replace Glow Plug and Pump
Unscrew the ceramic glow plug from the combustion chamber using the appropriate wrench, then install the new Webasto/Espar glow plug and torque it to manufacturer specifications. Next, disconnect the fuel lines from the old 12V dosing pump, unscrew its mounting bracket, and install the replacement pump with new silicone fuel tubing secured by hose clamps.
Step 4: Install Inline Fuel Filter System
Cut the diesel fuel line at an appropriate location upstream of the heater and insert the new inline diesel fuel filter, securing both fuel line connections with stainless steel hose clamps. Ensure the filter is oriented correctly with flow direction arrows pointing toward the heater and positioned where you can access it for future maintenance.
Step 5: Service Intake and Exhaust Silencers
Remove the combustion chamber blower motor by unbolting its mounting hardware and disconnecting its electrical connector. Inspect the intake and exhaust silencers for carbon buildup or debris, replacing them with the new silencer kit and reattaching the blower motor with its electrical connections secure.
Step 6: Reconnect Control Panel and Wiring
Reinstall your diesel heater LCD control panel and reconnect all electrical connectors to the glow plug, fuel dosing pump, and blower motor, ensuring wires are secure and not pinched. Verify that the negative battery terminal is still disconnected before powering on any systems.
Step 7: Test Heater Operation and Performance
Reconnect the negative battery terminal and power on your diesel heater, observing the LCD control panel for proper startup sequence and glow plug pre-heat indicator. Run the heater for 15-20 minutes, checking for proper fuel flow through the new pump, listening for abnormal combustion noise, and using your multimeter to confirm stable voltage throughout the system.
Recommended Parts
| Part | Link |
|---|---|
| Webasto / Espar ceramic glow plug | View on Amazon |
| Diesel heater fuel dosing pump (12V) | View on Amazon |
| Inline diesel fuel filter | View on Amazon |
| Diesel heater LCD control panel | View on Amazon |
| Combustion chamber blower motor | View on Amazon |
| Intake & exhaust silencer kit | View on Amazon |
| Diesel fuel line silicone tubing (4mm) | View on Amazon |
| Digital multimeter (auto-ranging) | View on Amazon |