Quote:
Originally Posted by stevencvn72
I like the idea that the '72 sending units have two lines into the tank. Is there anybody out there that has a '72 that can confirm this? I have to get a new sending unit anyways.
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Here is my ’72 C20 with a TBI 350 sending unit with a factory return line. With the low fuel pressure TBI runs I haven’t had any issues running the return fuel through the little 5/16 line.
However, I wouldn’t recommend the little 5/16 return line on a higher pressure TPI system that runs in the 40 psi range or the later LS engines run up as high as 62 psi. The 8.1L in my ’78 K10 did not like the small 5/16 return line through the original fuel tank switch valve as it was way too restrictive causing the fuel pressure to run extremely high….like a 100 psi at idle! I ended up having to completely redesign the fuel system on that truck to create a larger return line and still have dual fuel tanks.
Again, this will work for low pressure TBI but not for higher pressure multiport.
