Return lines are inexpensive, available online for about $12 for the entire set. Also they are easy to substitute.
In my case it was not the return lines only but the problem was that the injector nipples got loose bc when i replaced and torqued the injectors the improper tool bent them and slightly pushed them into the injector itself. 4 of my 6 injectors were leaky then ad I experienced power loss and max revs at about 2500-2800. Other than that it started well (bc of electric pump in the tank) and ran fine.
There are several places where air can get in. Check filter area, return line joint where it reaches pump, banjos, clear hose etc.
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