mctb

Having now replaced the fuel pump and the relay im still not getting any power to the pump any ideas

FredR

Perhaps a clue as to the model/year?

mctb

1984 s2 4.7 EU model

FredR

I am not that familiar with your model year but as I understand it is engine managed by the LH2.2 and EZF systems. To switch on the fuel pump there needs to be a viable signal from the crank position sender and if the pump and relay are viable then that would be the next line of suspicion. The later models like mine have a sub board in the LH2.3 that is prone to failure and thus the thing will not start- as I am aware that is not an issue with the LH2.2 that is a simpler unit although how the fuel pump in your model year turns on once there is a viable signal from the CPS I am not sure but doubtless someone else will cover that.

Perhaps you can give John Speake a call in Cambridge- his contact details are on his website jdsposche.com. If there is a fault in that part of the system he is your new best friend!

soontobered84

What relay are you using for the fuel pump? Next relay to the left of the big one on the far right/bottom row. (XVII)

It should be a standard 53 relay for an S2.

You can jumper terminals 30 and 87 which should power the pump. Just remember to remove the jumper when the engine is not running.

jpitman2

IIRC the 1984 is an L-jet, with the barn door AFM. In that model the pump is controlled by the barn door moving off rest indicating air being sucked in. Try manually moving the door just off rest with the ignition on, listen for the pump. If nothing, try jumpering the pump relay - if still nothing, you need to check the pump itself with direct wires - if that works, the wiring between the central board and the pump is suspect. If direct power doesnt work, the pump is suspect. In my experience, ANY of the pumps from that model through to the end should work.
jp 83 Euro S AT 57k

Wisconsin Joe

84 US is L-jet.

84 Euro (S2) is LH 2.2.

More or less in sequence:

Alarm.
Crank position sensor.
EZF relay.
EZF itself (sends signal to LH)
LH relay.
LH itself.
Fuel pump relay.
Fuel pump itself.

Does your alarm work? Does it turn off? It will disable the car if its armed.
Do you have tach bounce when cranking? Do you have spark? Does it start on starting fluid?

Get some answers to these questions and you might get some better ideas.

As a first try, replace the LH & EZF relays. They're the same '53' relay as the FP (and a bunch of others).
Also, if your car is a 5 speed, make sure there's no relay in the kickdown position. That will also prevent the car from starting (although I'm not sure it would disable the fuel pump).

Edit to add the EZF relay & EZF to the sequence.

andy-gts

I had same type of issue due to extra relay by battery box for an upgraded 044 fuel pump, does yours have this extra relay by battery box ( would have been added, not a stock item)

John Speake

The EZ-F ignition ECU can fail on the Euro S2. I repair quite a few. As has been said, you need spark before the EZ-F sends a wake up square wave to pin 1 LH ECU.

There's no point chasing the fuel pump side of things until you have a good regular spark.

dr bob

Replace the three critical relays: Fuel pump, LH injection and EZF ignition.

Else:
Halve the diagnostics by connecting a jumper in the relay socket as suggested above. If the pump runs, try replacing the relay. If the pump doesn't run with the new relay, work your way through the EZF and LH diagnostics. If the pump doesn't run with the jumper installed, trace electrical from the battery (dedicated smaller positive connection at positive post must be clean and tight), then look at the pump itself.