Hello Trevor, I hope I can offer you some assistance.
Have you confirmed that when the vehicle stops the lift pump has stopped working? Or are you going by what the dealer has told you?
Do you have the VIN of the vehicle? So I can obtain the correct details.
Let me know and I'll reply as soon as I'm able to but please bear in mind the time difference between the UK and Australia.
Yes the pump is not running when the engine stops. I start it with the direct jumper lead to the pump, and it starts and runs fine. When i remove the jumper lead the engine runs for approx 20 seconds then stops and the pump is not running. The VIN # XXXXX XXXXX & Engine # XXXXX XXXXX
It is a Transit 125 350.
the fuel pump is operated by the engine management control module (PCM). The relay for the pump is energized by the PCM and sends power to the pump from fuse F1.5 in the fuse box under the bonnet. The fuse should be the 3rd fuse up on the left and is rated at 20 amp. Make sure this fuse is OK, check for 12 volts at this fuse with the engine cranking but without your jumper lead. If there isn't 12 volts check that the inertia switch for the fuel pump hasn't tripped this is a plunger switch inside the vehicle up behind the dash, just push the plunger down to reset it.
If this is OK check that the pump relay is operating, the relay is in the fuse box under the bonnet, it is the 2nd relay down on the right, it is a small relay. Try swapping this with another relay. The PCM monitors this relay and detects if there is no 12 volt feed from it.
The relay is only energized when cranking the engine or the engine is running, it isn't energized with the ignition tuned on but not cranking the engine.
Start with the pump relay circuit, let me know if I can assist further and I'll reply as soon as I'm able to.
Thankyou for your time Sean will try what you have suggested and I will get back to you asap if there is further problems.
But hopefully what you have suggested will be a fix.