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**hatzie** · 10-15-2016, 09:57 AM

The upside of the return line is no vapor lock.

I recommend SAE J30R9 hose on the sender to line sections and German Fuel Injection, Constant tension band clamps, or Oetiker Ear clamps rather than worm clamps. Small worm clamps do not work well. THe above pictures show the Fuel injection clamps on the supply and return lines. Clamping the vapor line is not really necessary it's completely up to you.

The fuel fill neck line and fill neck vent line can use worm clamps but I recommend Breeze Liner clamps with a tail covering the worm slots or better yet the spring loaded constant tension clamps rather than standard hardware store worm clamps.

I wrote an article on hoses and clamps.
http://67-72chevytrucks.com/vboard/s...d.php?t=696742

Bostonlocal that looks very clean Kudos on using good clamps that don't loosen up on the fuel lines.

10-15-2016, 09:57 AM	#8
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,920	Re: Is my gas tank vent sufficient? The upside of the return line is no vapor lock. I recommend SAE J30R9 hose on the sender to line sections and German Fuel Injection, Constant tension band clamps, or Oetiker Ear clamps rather than worm clamps. Small worm clamps do not work well. THe above pictures show the Fuel injection clamps on the supply and return lines. Clamping the vapor line is not really necessary it's completely up to you. The fuel fill neck line and fill neck vent line can use worm clamps but I recommend Breeze Liner clamps with a tail covering the worm slots or better yet the spring loaded constant tension clamps rather than standard hardware store worm clamps. I wrote an article on hoses and clamps. http://67-72chevytrucks.com/vboard/s...d.php?t=696742 Bostonlocal that looks very clean Kudos on using good clamps that don't loosen up on the fuel lines. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 10-15-2016 at 10:12 AM.