System Pressure
- There are 2 versions of Fuel Pressure Gauge (100 589 00 21 00) available. First version has junction block with 2 valve handles on it, which are numbered "1" or "3" in following procedure. Hose exiting side of junction block by "1" valve handle is hose "1".
- Second version has single valve handle on junction block. Hose leaving junction block 180° from valve handle is "B" and hose leaving junction block 180° from line to gauge is "A". When testing system pressure, close valve "1" and open valve "3" on first version or open valve on second version.
- Remove threaded pipe plug from test port in lower chamber of fuel distributor. Connect fuel pressure gauge line "1" or "A" to test port in lower chamber of fuel distributor. Use M12 X 1.5/M8 X 1 Reducing Bushing (102 589 06 63 00) to connect hose to chamber port.
- Remove fuel supply line for cold start valve from top of fuel distributor. Attach pressure gauge line "3" or "B" to cold start fitting on fuel distributor upper chamber. System pressure is checked with engine off. Engine temperature has no effect upon system pressure test. Remove fuel pump relay. Bridge terminals No. 7 and 8.
- System pressure should be 76.9-79.8 psi (5.4-5.6 kg/cm2 ). If pressure is not correct, check for defective fuel pump, restricted fuel return line or defective differential pressure regulator. Open pressure gauge valve "1". Remove fuel pump relay bridge.