Fuel system

Fuel system

• Operate pump with engine off.
  Remove the pump control relay: connect terminals 30 and 87 of the relay carrier block using a lead with a 10A fuse fitted (see figure alongiside).

Take great care when connecting terminals 30 and 87 because an incorrect connection between terminals (30 and 85) could damage the ECU irremediably.

• The pressure reading on the gauge should stabilize at 3 ± 0.2 bar under these test conditions.
  If pressure is insufficient, carry out the next test.

Check 2

Checking maximum pump supply pressure
(or pump efficiency)

Carry out this test only if absolutely necessary

Same connections as in previous test.

• Close fuel cock control lever (arrowed) (downstream from pressure gauge).
• operate the pump with the engine off as described. The pressure should reach 6 bar but not exceed 7.5 bar (pump pressure relief valve setting). Once this pressure level has been reached, cut off the supply to the pump by removing the bridge from the relay carrier block in order to avoid damage to the pressure regulator internal membrane. Otherwise replace the pump because it is defective.