Q: Car start problems, diesel leak

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I have a leak next to my left rear wheel in a pipe going to the diesel tank, and recently the car has been difficult to start. Sometimes it starts without any problems, sometimes I have to crank it a while for it to start, sometimes it shuts down after the first time I start it. And also, if I drive at 20-30 kmh, and give full throttle and get to 60-70kmh the car shuts down and it says "EPC Visit Workshop". But the message disappears when I reboot the car. I also recently changed diesel filter and gave the engine a quick wash. My thought is that when I give full throttle the fuel pump pumps diesel to the engine but drags air with it as well due to the leak that makes it shut down. You think I am correct?

My car has 139808 miles.
My car has an automatic transmission.

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