Those are the delivery valves coming off the injection pump but I'm not seeing the leak.
If the leak is coming from the delivery valve(s)...they have o-rings that can go bad from time to time. They are pretty easy to replace and cheap to buy. You need a special socket to remove the holder. Its on Amazon (that where I got mine). Then you need new o-rings and crush washers.
If the leak is from the hard line the only solution is to buy a replacement hard line. They are about $60 new I think. At least my 602 lines were.
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