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Home >> Volvo >> 1977 >> 242 Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Fuel Delivery >> BOSCH Cis Fuel Injection - SAAB & VOLVO >> Test Equipment Hook-Up >> Installing & Bleeding Pressure Gauge >> Bleeding Pressure Gauge

Bleeding Pressure Gauge

  1. On 1975-77 models, disconnect airflow sensor connector. This isolates the safety circuit and allows fuel pump to run with ignition ON and engine NOT running.
  2. On 1978-79 Saab, remove fuel pump relay and install jumper wire between terminals No. 30 to 87 in relay holder. On 1978-79 Volvo, connect Test Relay (5170) to ignition coil and ground. See Fig 1. This will permit fuel pump to operate with ignition ON with engine OFF.
  3. Check that all equipment is properly installed. Turn ignition ON and let pressure gauge hang lower than hose connections to engine. To bleed gauge, repeatedly open and close valve 3-4 times. Now place pressure gauge higher than hose connections.
    Fig 1: 1978-79 Volvo Test Relay Installation
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