Fuel line fitment issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Stephen717** · 04-02-2018, 03:03 PM

So I'm having a bit of trouble with my new fuel tank. Got it bolted in, new sending unit installed, and lock ring around the sending unit. Problem is I have the original fuel line in the truck and the new sending unit has a bigger fitting than the fuel line (which I'm pretty sure is 3/8" od). So my question is has anyone else had this problem and what did you do to solve it. Fuel tank and sending unit both came from LMC. Thanks

B. W. · 04-02-2018, 04:44 PM

These trucks came with 5/16" & 3/8" fuel lines out of the tank, my guess: you have 5/16 line and a 3/8" sender?

**FirstOwner69** · 04-02-2018, 05:46 PM

What B. W. said.
If I recall correctly, the 5/16" was used for 6 cylinder trucks and 3/8" was for V-8s.

04-02-2018, 03:03 PM	#1
Stephen717 Senior Member Join Date: Aug 2016 Location: Loris South Carolina Posts: 429	Fuel line fitment issues So I'm having a bit of trouble with my new fuel tank. Got it bolted in, new sending unit installed, and lock ring around the sending unit. Problem is I have the original fuel line in the truck and the new sending unit has a bigger fitting than the fuel line (which I'm pretty sure is 3/8" od). So my question is has anyone else had this problem and what did you do to solve it. Fuel tank and sending unit both came from LMC. Thanks

04-02-2018, 04:44 PM	#2
B. W. Registered User Join Date: Nov 2014 Location: Bigfork, Montana Posts: 1,137	Re: Fuel line fitment issues These trucks came with 5/16" & 3/8" fuel lines out of the tank, my guess: you have 5/16 line and a 3/8" sender?

04-02-2018, 05:46 PM	#3
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,852	Re: Fuel line fitment issues What B. W. said. If I recall correctly, the 5/16" was used for 6 cylinder trucks and 3/8" was for V-8s.



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