G420E/G424E Tier LP Engine Test And Adjustments 79
Secondary Stage Test Connection
Primary Stage Test Hardware
1. Hand vacuum pump.
2. Regulator Fuel Inlet test fitting (¼” NPT standard
air coupling).
3. Test Gauge fitting (1/4” NPT X 1/4” Hose Barb).
4. Vacuum hose or vinyl tubing.
5. 0-60 in W.C. Magnehelic Gauge (inches of water
column).
Primary Stage Pressure Test
1. Remove the primary test port plug from the side of
the regulator and install the ¼” NPT hose barb
fitting.
2. Connect a compressed air line (shop air ~100psi)
to the liquid propane fuel inlet of the N2001
Regulator (Figure R12).
Union Tee
Vacuum
Hand Pump
Vapor Outlet
Test Fitting
Magnahelic
Gauge
Test Port
Figure R12
Fule Inlet
Figure R11
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