1995 ldv 400 starts on key but wont shut down on key?

you need to check that there is no electrical feed to stop solenoid when ignition is off.if not then solenoid needs removing and checking/cleaning,if there is a feed when ign is off,check wiring as there may be a diode in the circuit that has failed.

k
November 2012

have a look on the fuel pump for a fuel cut off switch

cdc
November 2012