FUEL DELIVERY SYSTEM – V8 (page 5 of 6)

FUEL DELIVERY SYSTEM – V8

19-2-12 DESCRIPTION AND OPERATION

Test Results

A = Current stabilises

B = Current drops

C = Current rises

D = No leak detected

E = 0.5mm leak

F = Leak >1.0mm

G = Change over valve energised

H = Pump motor energised

I = Motor current-Pressure

J = Reference measurement 0.5mm

K = Time duration

The time duration varies between 45 & 270 seconds depending on the resulting leak diagnosis test results (developed 
tank pressure “amperage ”within a specific time period). However the chart above depicts the logic used to determine 
fuel system leaks.

M19 3581

A

B

C

G

H

D

E

F

I

K

J