Dayton Operating Instructions and Parts Manual
Model 3VG79A
Maintenance (Continued)
Pressure
Gauge
Figure 10 - Adjusting Pump Pressure
FUEL FILTER
1.Remove side cover screws using 5/16"
2.Remove side cover (See Figure 11).
3.Pull lower fuel line off fuel valve fitting.
4.Carefully pry bushing, lower fuel line, and fuel filter out of fuel tank.
5.Wash fuel filter with clean fuel and replace in tank.
6.Attach lower fuel line to fuel valve fitting.
7.Replace side cover.
FUEL VALVE
1.Remove side cover (See Figure 11), fan guard, and upper shell (See Figure 6, page 6) screws using 5/16"
2.Remove fan (See Fan, page 6).
3.Pull lower fuel line off the fuel valve fitting (See Figure 12).
High Voltage.
Bushing, Lower Fuel Line, and Fuel Filter 
Side | Fuel Valve | |
Fitting | ||
Cover | ||
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Figure 11 - Fuel Filter Removal
4.Disconnect red and white wires from fuel valve (See Figure 12).
5.Using 1/4" nut driver remove 2 screws/ lockwashers holding fuel valve and bracket to lower shell (See Figure 12). Save these screws/lock washers.
6.Using 1/4" nut driver remove 2 screws holding fuel valve to bracket. Save these screws.
| Valve | Lock Washer |
| Fittings | |
| Screw | |
Fuel Valve |
| |
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| |
Electrical |
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Wires |
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Bracket
Screw
7.Attach new fuel valve to bracket with 2 screws.
8.Install new fuel valve and bracket on lower shell with 2 screws/lockwashers.
9.Connect red and white wires (polarity not important). Connect upper and lower fuel lines to fuel valve.
10.Replace fan, fan guard, upper shell, and side cover.
SPARK PLUG
1.Remove upper shell (See Figur e 6, page 6).
2.Remove fan (See page 6).
3.Remove spark plug wire from spark plug.
Burner Head | Spark Plug Wire |
Wave
Spring Spark
Washer Plug
Figure 13 - Spark Plug Removal
4.Remove spark plug and wave spring washer from burner head using 13/16"
5.Clean and regap spark plug electrodes to .110 gap.
Bend Here to Adjust Gap
Gap
Lower Fuel | Figure 14 - Spark Plug Gap |
Line |
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Figure 12 - Fuel Valve Replacement |
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®
7
Version B - For Reduction | G016.J |
