B54-58: From B16: Line pressure too low
From B16: Line pressure too lowWhen the fault has been rectified proceed with B17 B14-24: Checking All Pressures
B54
Check for external leakage
(Between the fuel pump and fuel distributor.)
For cars equipped with a fuel leakage return line between the fuel accumulator and fuel tank: remove the tank cap to release any overpressure and disconnect the hose from the fuel accumulator.
Check for leakage and reconnect the hose.
B55
Check the tank pump
The tank pump was introduced in 1977 but may have been fitted to tome models before this date.
Unscrew the fuel tank cap and listen to the sound of the pump.
A defective tank pump often causes an increase in the noise level at the main fuel pump.
Tank pump does not work: check the fuse in the boot (trunk) (1975-1978) or fuse no.5 in the fusebox (1979-).
B56
Check currant consumption of tank pump
Connect an ammeter to the junction in the boot (trunk).
The current consumption should be = 1-2 amps.
Incorrect: check the tank pump and filter. If correct, test with a new tank pump.
No current consumption: check for voltage at the pump. If OK. test with a new pump.
B57
Check capacity of fuel pump
Turn off the ignition.
Unscrew the fuel tank cap to release any overpressure in the fuel tank.
Disconnect the return line at the connection in the engine compartment and hold the end above a measuring cylinder.
Turn on the ignition for 30 seconds.
The minimum amount of fuel in the measuring glass should be:
1975-1979: 0.8 litre (0.75 US qt)
1980- (except E-Turbo 1981): 1.0 litre (1.0 Us qt)
E-Turbo 1981: 1.25 liters (1.2 Us qt)
Reconnect the return line.
Capacity too low: retest with a new fuel pump. If this does not help, the fault may be due to a blocked fuel filter. fuel line or fuel distributor.
B58
Adjust the line and rest pressures
See B70. Clean the line pressure regulator and fit new 0-rings wherever necessary.