TP-6519 8/17 69Section 5 Component Testing and Adjustment
5.12.2 Fuel Regulators
The typical gaseous fuel system uses two regulators.
The primary regulator reduces the line pressure to an
allowable inlet pressure for the secondary regulator.
The fuel supplier provides and maintains the primary
regulator. The secondary r egulator is factory-installed
on the generator set and is designed for a maximum
inlet pressure of 2.7 kPa (6 oz./in.
2
) or 280 mm (11 in.)
water column.
Note: Do not attempt to adjust the fuel mixture or engine
speed by adjusting the regulators.
The fuel lockoff prevents fuel flow when the engine is not
operating. See Figure 5-32. Do not try to adjust the fuel
pressure, fuel mixture, or engine speed using the fuel
lockoff.
Checking the Fuel Pressure
Use a gauge or manometer to check the fuel pressure at
the secondary regulator inlet. See Figure 5-32.
Measure the fuel pressure with the generator set
running at rated load. The fuel pressure should be
178--280 mm (7--11 in.) water column or 1.7--2.7 kPa
(4--6 oz./in.
2
). Contact the fuel supplier if the inlet
pressure is not within the specified range.
TP-6519
1
1. LP orifice fits inside hose fitting
2. Hose fitting
3. Secondary regulator
4. Fuel lockoff (do not adjust)
5. Fuel solenoid valve
6. Fuel inlet, 1/2 in. NPT
7. Inlet pressure check location
2
4
6
7
3
5
Regulator, side view
Figure 5-32 Fuel Regulator with LP Orifice and Fuel Solenoid Valve
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