I'm 80% sure its the sender but im a bit confused (not hard) my fuel guage has been dodgy since i bought the car but its getting annoying now. If i fill the car to the brim the guage works until it gets to under half but it will sit on full for about 10mins of driving then go down slowly till it hits red light then stays there until i restart the car. If i was to buy a new fuel pump with the sender could it be from any 2.0 peugeot or does it have to be a gti6 pump?

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R.I.P pete sims

0-60 6.4
Standing ¼ mile 14.9 on bold tyres