Pump Pressure Adjustment; Fuel Filter; Spark Plug - Desa B50G Owner's Manual

Pump Pressure
Adjustment
1. Remove pressure gauge plug from
filter end cover.
2. Install accessory pressure gauge
(part number HA1180).
3. Start heater (see Operation, page
6). Allow motor to reach full speed.
4. Adjust pressure. Turn relief valve
to right to increase pressure. Turn
relief valve to left to decrease
pressure. Set pump pressure at 3.4
psi.
5. Remove pressure gauge. Replace
pressure gauge plug in filter end
cover.

Fuel Filter

1. Remove side cover screws using
5/16" nut-driver.
2. Remove side cover.
3. Pull upper fuel line off fuel filter
neck.
4. Carefully pry bushing and fuel
filter out of fuel tank.
5. Wash fuel filter with clean fuel and
replace in tank.
6. Attach upper fuel line to fuel filter
neck.
7. Replace side cover.

Spark Plug

1. Remove upper shell (see page 9).
2. Remove fan (see page 9).
3. Remove fuel and air line hoses
from nozzle assembly.
4. Remove spark plug wire from
spark plug.
5. Remove two screws using 5/16"
nut-driver and remove burner
strap.
6. Place hex-body of spark plug into
vise and tighten.
7. Remove spark plug mounting nut
using 11/16" open-end wrench.
8. Remove burner strap from spark
plug.
9. Clean and regap spark plug
electrodes to .055" gap.
10.Replace burner strap onto spark
plug. Rotate burner strap to
position spark plug electrodes (see
Figure 12, page 11).
11.Tighten spark plug with spark plug
mounting nut.
12.Release hex-body of spark plug
from vise.
10
Pressure
Gauge
Plug
Figure 7 - Pressure Gauge Plug Removal
Side
Cover
Combustion
Chamber
Continued
Relief
Valve
Pressure
Gauge
Fuel Filter
Figure 8 - Adjusting Pump Pressure
Upper Fuel Line
Figure 9 - Fuel Filter Removal
Spark Plug
Mounting Nut
Burner
Strap
Air Line
Hose
Figure 10 - Spark Plug Removal
.055" Gap
Figure 11 - Spark Plug Gap
Spark
Plug Spark Plug
Wire
Nozzle Assembly
Fuel Line Hose
Bend Here
to Adjust
Gap
102016