Renault clio fuel pump under the back seat; how do you remove it?

The injectors are not coded. The crack shaft sensor may be your fault

Do you always go to the same pump? Some are more sensitive to others. But they are designed to prevent spillage, so will turn off when they sense back pressure. Maybe you could try filling slower. If that doesn't help, it is possible that there is an obstruction or damage to the filler pipe of your car - get your service garage to look at it.

try under back seat big rubber gromit fuel pump is in there remove pump and drain or find fuel pipes on engine and use a hand pump bubble or 12volt pump to drain

On a Renault the fuel pump relay should be under the bonnet next to the battery (black box).

videos in the link

https://www.google.com/search?q=remove+the+back+seats+5+door+renault+clio+2002

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The car is spinning faster because the battery charged itself since it hasn't been drove. Check all your fuses first. Ignition fuses and fuel pump fuse. Make sure the fuel pump is kicking on. You should hear a buzzing sound when you first turn the key for a second or two. Put your head in the back seat. If it is not kicking on, this could be the problem. You can spray gas in the carborator to tell to. Start your car and see if it starts. If it starts, then dies, it is fuel related. Either pump, filter, injectors, fuel rail. Make sure your spark plug wires are all connected and in good shape. Check the timing belt. You can check this by removing the front protection cover. Make sure the belt is good and there is no teeth missing. Write me back when you check this or you have a question. I am here to help my friend in any way I can.

most fuel pumps if not all are inside the fuel tank. to replace it check in your trunk if you have access through there or under your back seat. most likely you'll have to drop the tank

It is best that you disconnect the negative battery terminal while disconnecting & removing or reinstalling the seat.

Be sure to ground yourself by touching metal when going to unplug any harness in a computer controlled vehicle to prevent static discharge. (the airbag is connected throught the harness you are removing and any spark that would hit that wire, could trigger the airbag to deploy)
good luck

under spare wheel in boot ,,,,or under passenger seat LHD

That means that a problem occurred with the airbag.