Fuel Return line needed?

Fiat88 · Post by **Fiat88** » Mon Oct 03, 2011 9:43 pm

So I'm ordering new metal fuel lines to replace the rubber lines the po had ran under the car. The DFEV carb doesn't use the return line so do I even have to run a return line or can I just cap off the line at the fuel sending unit and just run a new supply line? Thanks for the advice?

vandor · Post by **vandor** » Mon Oct 03, 2011 10:23 pm

You don't need a return line if you will run a DFEV. I actually ran stock carbs with blocked off return lines with no adverse effects. I think the reason to have it is to keep the fuel cooler by recirculating it to the tank.

Fiat88 · Post by **Fiat88** » Mon Oct 03, 2011 10:51 pm

Thanks for the quick response!

baltobernie · Post by **baltobernie** » Tue Oct 04, 2011 2:27 pm

I think it also makes life easier for the fuel pump, by reducing output pressure to essentially zero.

vandor · Post by **vandor** » Tue Oct 04, 2011 3:12 pm

baltobernie wrote:I think it also makes life easier for the fuel pump, by reducing output pressure to essentially zero.

If you look at the return nipple on the carb you will see that on the inside it only has a tiny hole, so only a small amount of fuel is returned to the tank. Because of this the output pressure is not zero. If there was no pressure the fuel would not go into the carb bowl, it would just recirculate back to the tank.

WYSpider · Post by **WYSpider** » Tue Oct 04, 2011 8:44 pm

These are part of my fuel return line with a DFEV

baltobernie · Post by **baltobernie** » Wed Oct 05, 2011 9:42 am

Good info, guys; I did not know this.

Fuel Return line needed?

Fuel Return line needed?

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Re: Fuel Return line needed?

Re: Fuel Return line needed?

Re: Fuel Return line needed?

Re: Fuel Return line needed?

Re: Fuel Return line needed?