Fuel Line / Sending Unit ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67Slider · 08-10-2010, 12:13 PM

I have a 67 C10 that originally had a L6. It now has a 350. The gas tank sending unit is bad and I am going to replace it. If I stay with the original 5/16th sending unit and and fuel line will it rob my V8 of fuel? I am not planning on adding any Hi Perf stuff just a nice running 350. Or should I switch everything out to the 3/8th. To me it just doesn't seem like that the two hoses have that much difference that my engine would get starved for fuel.

What say you gentlemen?

POPO1984 · 08-10-2010, 01:06 PM

I think you will be okay on a stock 350

**LockDoc** · 08-10-2010, 02:35 PM

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I run 5/16 with my 454 with no problems. The engine is stock and I don't hot rod it much...

LockDoc

myoldchevytruck · 08-10-2010, 02:40 PM

Quote:

Originally Posted by LockDoc

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I run 5/16 with my 454 with no problems. The engine is stock and I don't hot rod it much...

LockDoc

Leon, are you running an in cab tank or under frame tank?

myoldchevytruck · 08-10-2010, 02:39 PM

My 69, originally had an I-6 and was swapped to a 350 by the previous owner, the lines on my truck were 3/8" (I'm guessing he changed them to 3/8") I went with steel braided lines on the topside and about 24" of steel braid from the mechanical fuel pump to the in cab tank and used the existing hard line the rest of the way. I purchased a new sending unit in my build. I purchased it from Brothers Trucks - http://www.brotherstrucks.com/products.asp?dept=959
and the V8 size was a 3/8" fitting. See the 5th one down on the brothers link, it shows that it can be used on 6cyl. but a reducer is needed. For your V8 setup, I think your fuel line may be needed to change to 3/8"

67Slider · 08-10-2010, 02:56 PM

Thanks guys. I was debating on buying a flaring tool and making my own fuel line with the 3/8th. That way I can make my own transmission lines too. Anybody done that and is it worth the time it takes rather than buying new?

cdowns · 08-10-2010, 05:43 PM

i'd inspect the whole length of the line first if no rust issues i'd keep the 5/16 but if a replacement is due i'd go for the 3/8 stuff

1967C20 · 08-10-2010, 07:25 PM

My 67 actually had a 5/16 line with the factory 327. I figured it out when I ordered the V-8 sender and it didn't fit. The only thing I can figure is the factory would install whatever they had laying around. You should be OK; I've got a mild cam and a 4bbl and I've never experienced any fuel starvation issues.

Longhorn Man · 08-10-2010, 10:29 PM

a 2 bbl carb'd small block would have come with 5/16ths line.

If you are running a stock, or even an almost stock engine, and not running it at 4000+ RPM all the time, then you'll be fine.

08-10-2010, 12:13 PM	#1
67Slider Registered User Join Date: Mar 2010 Location: Pueblo West, CO Posts: 944	Fuel Line / Sending Unit ?'s I have a 67 C10 that originally had a L6. It now has a 350. The gas tank sending unit is bad and I am going to replace it. If I stay with the original 5/16th sending unit and and fuel line will it rob my V8 of fuel? I am not planning on adding any Hi Perf stuff just a nice running 350. Or should I switch everything out to the 3/8th. To me it just doesn't seem like that the two hoses have that much difference that my engine would get starved for fuel. What say you gentlemen? __________________ 67 C10 Stepside 66 Mustang Coupe 99 Burb 2500

08-10-2010, 01:06 PM	#2
POPO1984 Registered User Join Date: Jul 2009 Location: Houston, Tx Posts: 1,133	Re: Fuel Line / Sending Unit ?'s I think you will be okay on a stock 350 __________________ 1972 SWB Medium Olive South Houston Instagram: Antbish84

08-10-2010, 02:35 PM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,430	Re: Fuel Line / Sending Unit ?'s - I run 5/16 with my 454 with no problems. The engine is stock and I don't hot rod it much... LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

08-10-2010, 02:39 PM	#5
myoldchevytruck Retired Air Force Veteran Join Date: Aug 2007 Location: Pembroke Pines, Florida 33024 Posts: 1,808	Re: Fuel Line / Sending Unit ?'s My 69, originally had an I-6 and was swapped to a 350 by the previous owner, the lines on my truck were 3/8" (I'm guessing he changed them to 3/8") I went with steel braided lines on the topside and about 24" of steel braid from the mechanical fuel pump to the in cab tank and used the existing hard line the rest of the way. I purchased a new sending unit in my build. I purchased it from Brothers Trucks - http://www.brotherstrucks.com/products.asp?dept=959 and the V8 size was a 3/8" fitting. See the 5th one down on the brothers link, it shows that it can be used on 6cyl. but a reducer is needed. For your V8 setup, I think your fuel line may be needed to change to 3/8" __________________ Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors

08-10-2010, 02:56 PM	#6
67Slider Registered User Join Date: Mar 2010 Location: Pueblo West, CO Posts: 944	Re: Fuel Line / Sending Unit ?'s Thanks guys. I was debating on buying a flaring tool and making my own fuel line with the 3/8th. That way I can make my own transmission lines too. Anybody done that and is it worth the time it takes rather than buying new? __________________ 67 C10 Stepside 66 Mustang Coupe 99 Burb 2500

08-10-2010, 05:43 PM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Fuel Line / Sending Unit ?'s i'd inspect the whole length of the line first if no rust issues i'd keep the 5/16 but if a replacement is due i'd go for the 3/8 stuff __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-10-2010, 07:25 PM	#8
1967C20 Junior Member Join Date: Jun 2007 Location: China Grove, NC Posts: 122	Re: Fuel Line / Sending Unit ?'s My 67 actually had a 5/16 line with the factory 327. I figured it out when I ordered the V-8 sender and it didn't fit. The only thing I can figure is the factory would install whatever they had laying around. You should be OK; I've got a mild cam and a 4bbl and I've never experienced any fuel starvation issues. __________________ "A man's got to know his limitations." - Dirty Harry _______________________________________________ 1967 C20 Custom Camper, 327, Powerglide, PS, PB, No-Spin Locker

08-10-2010, 10:29 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Fuel Line / Sending Unit ?'s a 2 bbl carb'd small block would have come with 5/16ths line. If you are running a stock, or even an almost stock engine, and not running it at 4000+ RPM all the time, then you'll be fine.



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