fuel return line leaking
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Yes, it's one long line with a push lock connector on each end. Is the line itself leaking? Or is there just fuel everywhere Underneath the truck?
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As far as too much fuel pressure; that will not cause seals to blow on the return side the what you need to be concerned about with to much fuel pressure is blowing the seals out of the pump.
If I were you while I was working on it I work tighten up the bango bolt on the back of the head, it's a 17mm. Every once in a great while the need to be tightened, just don't break it off in the head, make sure it's snug. And also the T has small rubber seals were the lines go into it. You can take it off check the seals, clean the T and put it back together with thread tape. That's just if you want to make sure.
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