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03-09-2024, 01:03 AM
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#1 |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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1969 250 i6 soft fuel line size
Hi all, I’m going to replace the soft rubber fuel line that runs between the tank hard-lines and the fuel pump on my 1969 250 i6. There is a stretch of soft line that’s maybe 18inches long - really old and brittle on my truck.
Before I order, I just wanted to confirm what was the oem softline size? Can anyone confirm? Thanks Luke |
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03-09-2024, 01:53 AM
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#2 | |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,770
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Re: 1969 250 i6 soft fuel line size
Quote:
I6 is 5/16" ID. Small block and big block are 3/8" ID. Any auto parts store should have it. .
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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03-09-2024, 02:18 AM
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#3 |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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Re: 1969 250 i6 soft fuel line size
Thank you for the confirmation! I thought it was 5/16”
So you’re saying that even i6 and v8 hardliners have different diameter? Gas tanks are identical however? I’m asking because at some point I may want to do a v8 swap. |
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03-09-2024, 02:44 AM
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#4 | |
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Senior Member
Join Date: Jan 2015
Location: central oregon
Posts: 269
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Re: 1969 250 i6 soft fuel line size
Quote:
All v8’s have 3/8 sending unit to carb |
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03-09-2024, 05:27 PM
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#5 |
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Senior Member
 
Join Date: Jan 2005
Location: CA
Posts: 5,977
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Re: 1969 250 i6 soft fuel line size
I believe V8s with a two-barrel carb also had 5/16 line. That's how my '68 was.
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03-09-2024, 11:56 PM
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#6 | |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,597
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Re: 1969 250 i6 soft fuel line size
Quote:
However, GM must have had a good reason to use 3/8" line on 4bbl engines, because they typically reduce costs wherever they can.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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09-13-2024, 01:09 AM
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#7 |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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Re: 1969 250 i6 soft fuel line size
Any issue to run the 5/16” lines with a bone stock 350?
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1969 C10 Shortbed |
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09-13-2024, 07:37 AM
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#8 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,824
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Re: 1969 250 i6 soft fuel line size
Not with a stock 350, as the others that have chimed in have done a lot with that size line. If you replace the sending unit and hard lines for any reason, I'd recommend an upgrade to the 3/8".
__________________
1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion..  1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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09-13-2024, 09:11 AM
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#9 |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,716
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Re: 1969 250 i6 soft fuel line size
My 68 anniversary 327 4bbl has 5/16 fuel lines hard and soft . My 72 350 4bbl has 3/8
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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03-09-2024, 09:49 PM
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#10 |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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Re: 1969 250 i6 soft fuel line size
That’s helpful
How much power will a 3/8” line support before it becomes a bottleneck? |
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03-09-2024, 10:26 PM
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#11 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,675
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Re: 1969 250 i6 soft fuel line size
Smart money would be to buy the sender with the 3/8" line if you are replacing it, and use an adapter to reduce the line the rest of the way. No point in buying things twice, and an adapter is cheap. FWIW, I put a 4 barrel carb on my '64 Malibu with a 283 and a powerglide trans. Same 5/16" fuel line got me to 120 MPH. How fast and quick do you want to go?
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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