Checking Pressure Regulator

1, Take off air cleaner assembly.

2. Connect pressure gauge with hose from pressure tester P 378 on testing connection.

Checking Vacuum Control Checking Pressure Regulator

4. Bridge terminals 30 and 87 with an extra wire. Fuel pump should now run.

5. Shut off return line of one pressure regulator with a standard hose clamp. Fuel pressure should rise only slightly (approx. 0.05 bar). If pressure rises, return line of opposite pressure regulator is clogged or pressure regulator is defective.

Check second pressure regulator in same manner.

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