hello I have a stock ethanol Denver out of a 06 5.3 Tahoe
and wanting to put it in my 38 olds.

on the sencer their is a 3/8 efi end and a 5/16 efi end I assumed it went on the main line going to the injectors but 5/16 is the return line size and main line is 3/8 so I don't want a bottle neck at the sencer.

Should thos his be on the main line like I'm thanking or the return line ?

thank you Kelly

 

I have a sensor with 3/8 input and output, last year it was in the feed line to the engine and worked fine, but I went to -8AN feed this year and put the sensor in the return line, its working just fine there as well.

Some people even make a Y junction on the feed line to place the sensor in parallel. its another option.

 

Thank you.
I know the one I have is stock and one is 5/16 and 3/8 for the other I will prob plumb it in on the return line unless I hear different on here.