The fact that someone changed the Fuel Pump and Relay suggests that
some checks were done that pointed to no output from the pump.
If this is the case it's possible that the ECU was not issuing a command to energise
the pump, ie a faulty Crank Sensor.
Do a paperclip test and post results iaw this link.
http://www.omegaowners.com/forum/YaBB.pl?num=1189022687If this is ok, you may have an intermittent wiring fault in the pump/relay/ ecu
circuit.
You will need to isolate each circuit and test for faults.
A) Ecu to relay.
b) Power supply through the Relay to the Pump Fuse if the relay is working.
c) Fuse to fuel pump.
d) Fuel pump Earth Return.
For a quick check if the relay is working, check for a 12V supply at the pump fuse
with ignition switched on.
For the battery, stick a Voltmeter across it and check for a reading of approx 12.5
to 12.6 Volts.
If ok, start engine and stabilise the voltage reading across the battery.
You're looking for a higher reading circa 13 Volts.
If ok, load the circuit by switching on headlights and heated rear window and
recheck. You're looking now for between approx 13 and 14 volts.
That little lot should keep you going for a little while.
