TP-6735 7/1780 Section 5 Component Testing and Adjustment
5.11.3 Fuel Regulators
The typical gaseous fuel system uses two r egulators.
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.
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 5-29. 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 5-29.
Measure the fuel pressure with the generator set
running at rated load. The fuel pressure should be
5--11 in. water column or 1.2--2.7 kPa. Contact the fuel
supplier if the inlet pressure is not within the specified
range.
TP-6735
6
1. Fuel block (14RES/RESL)
2. Secondary regulator
3. Fuel lockoff (do not adjust)
4. Fuel inlet, 1/2 in. NPT
5. Hose fitting
6. LP orifice fits inside
hose fitting (20RES/RESL)
7. Regulator vent hose (20RES/RESL only)
8. Inlet pressure check location
5
3
4
8
2
Regulator, side view
5
2
3
4
1
14RES/RESL 20RES/RESL
7
Figure 5-29 Fuel Regulators
To Next Page
Loading...
