72 to 70 Fuel line swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HeavyD · 07-05-2005, 03:10 AM

Hi. I read that my fuel line from tank to pump in my 70 GMC with a 250 6 is smaller than a V8 line?? If so, what do I have to rob off my 72 V8 parts truck? One line or all of them? Do I have to swap the sending unit assembly too? Thanks.

JimKshortstep4x4 · 07-05-2005, 09:40 AM

You will need all of the lines including the tank unit.

Jim

HeavyD · 07-05-2005, 01:06 PM

Thanks.

jtminton · 07-05-2005, 01:09 PM

I know that the lines on my 72 are 3/8.

RicksTrucks · 07-05-2005, 03:49 PM

When I purchased a new sending unit for my 68 V8, the connector was too small on my line coming up through the floor. I called the vendor and they said the line was probably for a 6 cylinder. So I order a sending unit for a six and that worked fine. Funny thing though, my VIN shows this to be an 8 cylinder. Go figure.

fastwillie 696969 · 07-05-2005, 04:54 PM

isnt all the fuel lines 3/8 ?

69 longhorn · 07-05-2005, 06:39 PM

the 6 cyl trucks, & the 2 brl equipped sb trucks had a 5/16 fuel line....it should handle 325-350 hp on the street fine tho. i had to upgrade the fuel lines & system , when i was running a 461 " Olds(my guess, 425 or so on the ponies). If you arent all out racing, or heavy towing, you should be fine with the 5/16 line......crazyL

07-05-2005, 03:10 AM	#1
HeavyD Senior Member Join Date: Sep 2004 Location: Wakaw, Sask, Canada Posts: 3,180	72 to 70 Fuel line swap Hi. I read that my fuel line from tank to pump in my 70 GMC with a 250 6 is smaller than a V8 line?? If so, what do I have to rob off my 72 V8 parts truck? One line or all of them? Do I have to swap the sending unit assembly too? Thanks. __________________ "You can take the man out of PA, but you can't take PA out of the man"

07-05-2005, 01:06 PM	#3
HeavyD Senior Member Join Date: Sep 2004 Location: Wakaw, Sask, Canada Posts: 3,180	Thanks. __________________ "You can take the man out of PA, but you can't take PA out of the man"

07-05-2005, 01:09 PM	#4
jtminton II Timothy 4:2 Join Date: Mar 2005 Location: Fort Worth Posts: 361	I know that the lines on my 72 are 3/8. __________________ 72 C-20 2WD LWB Custom Camper Deluxe 350 4 Speed "Project Lazarus" MY TRUE PRIDE AND JOY "Dangit, Bobby, people will see that oil stain and think I'm a drunk."

07-05-2005, 03:49 PM	#5
RicksTrucks Senior Member Join Date: Jan 2005 Location: Claremore, OK 74017 Posts: 2,640	When I purchased a new sending unit for my 68 V8, the connector was too small on my line coming up through the floor. I called the vendor and they said the line was probably for a 6 cylinder. So I order a sending unit for a six and that worked fine. Funny thing though, my VIN shows this to be an 8 cylinder. Go figure. __________________ 68 Short Stepside C-10 69 SWB C-10 70 Flatbed C-20 70 LWB C-20 BB402 70 LWB C-10 CST 70 LWB C-10 CST 71 Short Stepside Cheyenne C-10 72 LWB C-10 72 Blazer 4x4 4spd 95 Jeep Cherokee 4x4

07-05-2005, 04:54 PM	#6
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	isnt all the fuel lines 3/8 ? __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

07-05-2005, 09:40 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	You will need all of the lines including the tank unit. Jim

07-05-2005, 06:39 PM	#7
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	the 6 cyl trucks, & the 2 brl equipped sb trucks had a 5/16 fuel line....it should handle 325-350 hp on the street fine tho. i had to upgrade the fuel lines & system , when i was running a 461 " Olds(my guess, 425 or so on the ponies). If you arent all out racing, or heavy towing, you should be fine with the 5/16 line......crazyL __________________ http://community.webshots.com/user/hotrodhorn



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