Checking fuel supply circuit

CHECKING FUEL SUPPLY CIRCUIT

Test 1

Testing fuel regulation pressure

• Disconnect fuel delivery line to manifold from arrowed fitting.
• Interpose pressure gauge 1895890000 between the disconnected pipe end and the fuel manifold with cocks (A) and (B) open.
• Activate fuel pump with engine off.

The last operation is carried out by selecting "fuel pump" test on a Fiat/Lancia tester. Under these conditions, the pressure gauge reading should stabilise at 3.0 bar. If pressure is insufficient, carry out the test 2.

Test 2

Testing maximum fuel feed pressure (or pump efficiency)

Same connections as previous test.

• Close fuel cock lever (A);
• operate the pump with the engine off, as described previously: pressure should not exceed 7 bar (pump pressure relief valve setting). Otherwise, replace the pump because it is defective.