Fuel Regulators - Kohler 17RES Manual

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 regulator is factory-installed
on the generator set and is designed for a maximum
inlet pressure of 2.7 kPa (6 oz./in.
water column.
Note: Do not attempt to adjust the fuel mixture or engine
speed by adjusting the regulators.
1
1. LP orifice fits inside hose fitting
2. Hose fitting
3. Secondary regulator
Figure 5-32 Fuel Regulator with LP Orifice and Fuel Solenoid Valve
TP-6519 8/17
2
) or 280 mm (11 in.)
2
3
5
4
4. Fuel lockoff (do not adjust)
5. Fuel solenoid valve
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.
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
2
(4--6 oz./in. ). Contact the fuel supplier if the inlet
pressure is not within the specified range.
7
6
Regulator, side view
6. Fuel inlet, 1/2 in. NPT
7. Inlet pressure check location
Section 5 Component Testing and Adjustment
See Figure 5-32.
TP-6519
69