D-1000B Heater
Operations & Maintenance
MAINTENANCE, and REPAIR PROCEDURES
5-8
DHS SYSTEMS LLC
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5.4.5 Removal and Installation of Fuel Pump Assembly
5.4.5.1
Removal Procedures:
1. Disconnect power cord from power source and allow heater to cool.
2. Remove four quick release pins and remove top cover (see Figure 5-1).
3. Using a 8mm nut driver, remove the upper heat shield (05) by removing six screws (79) and two sheet metal
screws (78); remove heat shield and set aside
4. Disconnect the fuel solenoid leads.
5. Using a 4mm Allen wrench, loosen and remove fuel solenoid cap nut (71A) and wave washer (71B) as shown in
Figure 5-6.
6. Using a 13mm open end wrench, loosen and disconnect the fuel feed hose (65) at the fuel pump (70).
7. Using a 15mm open end wrench, loosen and disconnect the fuel supply line (22B) from fuel filter and fuel return
line (22A) to the fuel tank at the fuel pump (70) (see Figure 5-6).
8. Using a 2.5mm Allen wrench, loosen (
DO NOT REMOVE
) three set screws on the fuel pump collar (see Figure 5-
4); remove fuel pump from electric motor assembly.
5.4.5.2
Installation Procedures
1. Using a 15mm open end wrench, connect and tighten the fuel supply line (22B) from fuel filter and fuel return line
(22A) to fuel tank at the fuel pump (70) (see Figure 5-6).
2. Using a 13mm open end wrench, connect and tighten the fuel feed hose (65) from the burner head (61) to fuel
pump (70).
3. Using a 4mm Allen wrench, attach fuel solenoid (71) wave washer (71B) and cap nut (71A) as shown in Figure 5-
6.
4. Positioned fuel pump (70) behind electric motor (10) aligning tabs on the plastic coupler to the slots inside the
electric motor as shown in Figure 5-6 and Figure 5-7. Push in until fuel pump (70) is seated against the electric
motor (10).
5. Using a 2.5mm Allen wrench, tighten three set screws on the fuel pump collar to secure the fuel pump (70) to the
electric motor (10) (see Figure 5-4).
6. Reconnect the fuel solenoid leads.
7. Install heat shield (05).
8. Using an 8mm nut driver install and tighten six screws (79) and two sheet metal screws (78).
9. Install the top cover and four quick release pins as shown in Figure 5-1.
10. Test heater in accordance with the operations manual (see Chapter 6) and check for fuel leaks.
