chevy and the fuel lines

[da mule]

So what do I need to do with the return line on the sbc when I put it in?
I know it needs to return to the tank.
I can use the vent in the fill neck for this. But do I need to vent this return back to the breather or just run it back to the tank?Will I get a vapor lock problem?
I am using a cap for the stock fill tank from a dozer ,so it is a tight,no vent, cap.

[Tomahawk715]

MuscleCar tv had a good spot on fuel plumbing-dont know if its still up on the site. If you vent it I cant see why you would get lock-heard one of the main advantages is your pump doesnt heat up-who would have thunk.

[FSJGuy]

I have TBI on my truck. The return line runs to the (vent?) cennection on the filler hose. No other connections to the tank and life is good.

[Barrman]

As said above. Yes, you can use the stock fuel tank vent line as a return for your fuel injection.

All fuel injected vehicles come with a sealed fuel system from the factory so fuel vapor won't evaporate into the air. So, a stock sealed M715 fuel cap will work just fine.

[da mule]

I do not have fuel injection.
this is an 86 305 with carb if it makes any diff.
good to know there is something that will work back when I do the swap.

[randyscycle]

I do not have fuel injection.
this is an 86 305 with carb if it makes any diff.
good to know there is something that will work back when I do the swap.

The extra line on the pump isn't a return line if I remember correctly. It is a vapor line which connected to the evap system and charcoal canister.

[wrecker]

If you have a carb, you should be able to just buy the older style fuel pump that has no return line. Less than 20 bucks and easier than routing a return line.

[Swampthang]

wrecker is correct. Mid 60's 327 pump has two lines and no return.