[dingov70]

Morning there , If you car has a mechanical pump on the engine , simply remove the pipe from the fuel tank & plug your electric pump into that pipe and empty your tank . If you have fuel injection , you will find the pump near the fuel tank . My trick for this is to remove the power feed from the wiring loom , fit a long pipe from outlet of the pump & into a suitably sized container to receive the fuel you pump out . Take a direct 12 volt feed from the battery & apply to the + terminal of the pump and away it will go emptying the tank for you . Due to the volume of diesel there is an almost zero fire risk due to sparks

Once the tank is empty , reconnect everything you undid and add petrol . The exhaust will smoke for a while until all traces of diesel have been burnt away