I have a peugeot 406 Hdi 2001 rapier . The diesel priming bulb burst leaking diesel whilst driving. i replaced the bulb with a multi purpose one.When i turn the ignition on and the lift pump in the tank cut in the priming bulb expanded to twice its normal size . I tried again, this time i started the car same happenedso i stopped the car . Disconnected the fuel line to the hp pump and put the fuel line into a container , turned the ignition on fuel bulb ok . There is a fuel line that comes off the top of the hp pump , disconnected this and put the end into a container, turned the ignition on ,priming bulb again expanded to twice its normal size so switched off the ignition . i could see what i thought was a pressure regulator on the hp pump so i went to the local breakers and aquired a pressure regulator , a priming bulb and some relays . I replaced these on to my car turned the ignition on, the priming bulb expanded and felt solid, started the engine it ran about 5 mins, then the connection on the bulb blew off . To much pressure ? , Reconnected the conctection and put extra jubilee clips on . i then started the engine , priming bulb still seems over pressurised to me . The lift pump in the tank was replaced last year , the fuel filter was changed a month prior to this happening. Anyone got any ideas . cheers Kevin