Complete repair guide for the Pleasure-Way Ascent – 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)
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Step-by-Step Repair Guide
Step 1: Diagnose Heater Malfunction and Prepare
Start by connecting your digital multimeter to the diesel heater’s power supply to verify you’re receiving the expected 12V output; if voltage is absent or fluctuating, check your RV’s battery and main disconnect switch. Before beginning any work, disconnect the negative battery terminal and allow the heater unit to cool completely for at least two hours, then locate the heater assembly (typically mounted under the floor or in a cabinet) and consult your Pleasure-Way Ascent’s service manual for exact component positions.
Step 2: Access and Remove Glow Plug
Locate the ceramic glow plug positioned in the combustion chamber head and carefully unscrew it using the appropriate socket or wrench, taking care not to damage the electrical connector. Once removed, inspect the old glow plug for carbon buildup or visible damage, then set it aside and clean the threaded cavity with a soft brush to remove any debris before installation of the replacement ceramic glow plug.
Step 3: Install New Ceramic Glow Plug
Thread the new Webasto or Espar ceramic glow plug carefully into the combustion chamber head, hand-tightening first to ensure proper seating, then use your socket wrench to snug it to manufacturer specifications (typically 12-15 Nm). Reconnect the electrical connector firmly and verify it seats completely, ensuring there are no loose wires that could cause intermittent ignition failures.
Step 4: Replace Diesel Heater Fuel Dosing Pump
Disconnect the fuel inlet and outlet lines from the old 12V fuel dosing pump by carefully loosening the barbed fittings or quick-disconnect couplers, and allow any residual fuel to drip into a small container. Remove the mounting bolts securing the pump to its bracket, install the new dosing pump in reverse order, and reconnect the fuel lines using your 4mm silicone tubing, ensuring all connections are tight and free of leaks.
Step 5: Service Fuel System Components
Replace the inline diesel fuel filter by closing the fuel line shutoff valve (if equipped) or pinching the fuel line with a hose clamp, then disconnect and remove the old filter cartridge. Install the new filter with the flow arrow pointing toward the heater unit, reconnect all fuel lines securely with your silicone tubing, and prime the system by cycling the fuel pump several times before running the heater.
Step 6: Verify Control Panel and Blower Function
Reconnect the LCD control panel to the main heater unit, ensuring the display lights up when you cycle the ignition to the on position and all menu buttons respond correctly to your input. Check that the combustion chamber blower motor runs smoothly when the heater initiates startup, listening for any unusual grinding or squealing noises that might indicate bearing problems or debris in the air pathway.
Step 7: Test Complete System Under Load
Reconnect your RV’s negative battery terminal, turn the heater on via the LCD control panel, and allow it to run for at least 10 minutes while monitoring the outlet temperature with an infrared thermometer or by feeling the warm air from the vents. Use your digital multimeter to confirm stable 12V supply throughout operation, check all fuel and air connections for leaks, and listen for the characteristic combustion sound; if the heater produces heat consistently and all electrical readings are normal, your service is complete and successful.
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 |