Pros and Cons of fuel return line... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**71CHEVYSHORTBED402** · 03-21-2019, 01:26 PM

I wonder how many of "us" don't have a return line and experienced vapor lock?

**Steeveedee** · 03-21-2019, 05:09 PM

Quote:

Originally Posted by 71CHEVYSHORTBED402

I wonder how many of "us" don't have a return line and experienced vapor lock?

My '70 does not have a recirc line, and if it gets hot enough it will vapor lock. Running the electric fuel pump to pressurize the fuel to the pump helps. It was hot out, but I wasn't even using the AC. It's why I'm nailing every opportunity for cooler running. That specific case, the fan clutch had given up the ghost, though.

GASoline71 · 03-21-2019, 06:45 PM

Quote:

Originally Posted by 71CHEVYSHORTBED402

I wonder how many of "us" don't have a return line and experienced vapor lock?

I was thinking the same thing. I've been playing with GM trucks and cars for many years and have never had to use a return line for any reason. Not saying that some might need to use a return line for whatever reason. But in my experience, i have eliminated the return line (usually becuase I have insyalled a performance mechanical fuel pump) and have just switched to a vented gas cap, and wah-lah...

Gary

**71CHEVYSHORTBED402** · 03-21-2019, 11:20 PM

Quote:

Originally Posted by GASoline71

I was thinking the same thing. I've been playing with GM trucks and cars for many years and have never had to use a return line for any reason. Not saying that some might need to use a return line for whatever reason. But in my experience, i have eliminated the return line (usually becuase I have insyalled a performance mechanical fuel pump) and have just switched to a vented gas cap, and wah-lah...

Gary

What's a performance mechanical pump Gary, can you be more specific?

GASoline71 · 03-24-2019, 12:08 AM

Quote:

Originally Posted by 71CHEVYSHORTBED402

What's a performance mechanical pump Gary, can you be more specific?

Yep... aftermarket fuel pumps that put out more GPH and a tad more pressure than stock. I have used Carter "street" (now "muscle car") and "strip" mechanical fuel pumps for ages.

Gary

**71CHEVYSHORTBED402** · 03-24-2019, 02:41 AM

Quote:

Originally Posted by GASoline71

Yep... aftermarket fuel pumps that put out more GPH and a tad more pressure than stock. I have used Carter "street" (now "muscle car") and "strip" mechanical fuel pumps for ages.

Gary

Thanks Gary

03-21-2019, 01:26 PM	#1
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,129	Re: Pros and Cons of fuel return line... I wonder how many of "us" don't have a return line and experienced vapor lock? __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s details such as OEM identifications& part numbers, written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025



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