System (Line) Pressure Test
- Connect and bleed pressure gauge and valve in same manner as for cold engine control pressure test. Keep fuel pump relay bridged. Be sure electrical plugs are connected to control pressure regulator and auxiliary air regulator.
- Ensure electric fuel pump activates when ignition switch is turned ON and that fuel filter is clean. CLOSE valve at pressure gauge. Start and run engine at idle.
- System (line) pressure should be 64-74 psi (4.5-5.2 kg/cm2
). If not, clean, check or adjust fuel distributor pressure regulator (relief) valve. If system pressure is low, check for leaks between fuel pump and control pressure regulator. Also check for defective fuel pump.
- System pressure may be adjusted by adding to or removing shims from valve. See Fig 1. Pressure will be changed 1 psi (.06 kg/cm2
) by a 0.004" (0.1 mm) shim or 4 psi (.3 kg/cm2
) by a.020" (0.5 mm) shim.
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