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Fuel return line on 1980 corvette


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We just swapped a 550hp 383 into my friends 1980 corvette.  He has a FAST EFI system on it that he's no longer happy with and is going back to a carburetor.  He just ordered a 750 Demon carb and I am giving him my spare Holley red fuel pump.  I run the same parts on my 67  mustang with no return line, been that way for years with no issues.  His car has a return line already on it, do we need to use it or can we just cap it off?  I have seen there are fuel filters with return ports on them so using it wouldn't be a big deal, I have just read some posts stating a possible pressure drop from doing this.  Here's some eye candy to go with this post.

1980 vette.jpg

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