Checks on the fuel supply circuit

CHECKS ON THE FUEL SUPPLY CIRCUIT

Checking fuel supply pressure

• Disconnect the fuel supply pipe (2) to the manifold from the appropriate connector (6);
• Position tool 1860955000 connecting it to the fuel supply pipe (2) and the connector (6) at the fuel manifold using the appropriate adaptor.

NOTE Tool 1860955000 comes with adaptors for connection to various types of injection systems; before carrying out the connections, fit the appropriate adaptors to the equipment.

• Position valve (11) in a closed position and valves (3) and (5) in an open position; make sure that the adjustment valve (4) is completely open.
• Operate the electric fuel pump (1) with the engine switched off using the Fiat/Lancia Tester activating the "fuel pump" test.
• The pressure reading on the gauge should stabilize at a pressure of 3 bar ± 0.2 bar.
• If the pressure measured is higher:
• disconnect the return pipe (9) from the fuel manifold and connect another pipe to collect the fuel which comes out in a suitable container;
• operate the electric pump once again, then check the pressure reading on the gauge:

1. if it reaches 3 bar, then the fuel return pipe to the tank must be checked because it is obstructed or bent;
2. if it exceeds 3 bar then the pressure regulator must be replaced because it is defective.

Checking maximum fuel supply pressure (or electric pump efficiency)

• Connect tool 1860955000 as described in the previous test.
• Close valve (5), keep valves (3 and 4) in a fully open position and valve (11) closed.
• Operate the electric pump (1) with the engine switched off as described in the previous test; the pressure should be exceed 15 bar (electric pump safety valve setting). If this is not the case, replace the electric pump because it is defective.

1. Electric fuel pump
2. Fuel supply pipe
3. Ball valve
4. Fuel pressure micrometric adjustment valve
5. Ball valve
6. Connector for supply pipe on fuel manifold (7)
7. Fuel manifold
8. Connector for return pipe on fuel manifold (7)
9. Fuel return pipe
10. Fuel pressure micrometric adjustment valve
11. Ball valve