Checks on fuel supply circuit

CHECKS ON FUEL SUPPLY CIRCUIT

1st Test

Checking fuel regulation pressure

• Disconnect the fuel supply pipe to the manifold from the union shown by the arrow;
• Place pressure gauge 189589000 with both taps A and B in the open position between the end of the pipe disconnected and the fuel manifold;

• operate the electric fuel pump with the engine switched off with the help of the Fiat/Lancia Tester activating the "fuel pump" test;
• the pressure reading on the pressure gauge should stabilize in these test conditions at around 3 bar. If the pressure is insufficient, carry out the 2nd test.

2nd Test

Checking maximum fuel supply pressure (or electric pump efficiency)

The same connections as for the previous test apply.

• Close lever A for the fuel tap (downstream of the pressure gauge);
• operate the electric pump with the engine switched off, as described in the previous test: the pressure should reach 6 bar and not exceed 7.5 bar (pump safety valve calibration). If this is not the case, replace the electric pump because it is defective.