Xantia - Draining the tank

[CitroJim]

... Is it wise to drain fuel from a petrol by removing the feed to the fuel rail and using the ignition to operate the lift pump? ...

I've seen this operation done in a repair shop, on a non-Citroen car.
Without starting the engine(!) they were able to get fuel for about 3 seconds
because a relay under dashboard was cutting off fuel supply.
Finally they replaced relay with a piece of wire for a non-stop fuel flow

I've done this with outstandingly successful results in the past, albeit by "hot-wiring" the pump. Mike and I recently used the method to drain the tank in a scrapped vehicle. The tank was near full and these was no way it could go to the scrapyard with all that petrol in it

After all, it's only doing the same as the pump does in normal operation.

[Toby_HDi]

Ok I'll do that I think.

Where is the fuel pump relay on the 405? And which pins need bridging? Failing that, how do I hot wire the pump?

[VertVega]

Repair shop car was a Wolksvagen and I guess there was diesel in tank instead of petrol or visa versa
Don't know pump relay on 405 May be you can find it by listening to the clicking sound.

CitroJim, Does "hot-wiring" mean that you apply 12V directly to the pump (?)