5/16 Fuel Line Upgrade - 4 Door - Chevelle Tech
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post #1 of 17 (permalink) Old Jan 5th, 19, 11:37 AM Thread Starter
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Scott
 
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5/16 Fuel Line Upgrade - 4 Door

Hi, I am looking to upgrade my 5/16 line on my 4-Door, the problem is, nobody sells 3/8 lines for the 4-Door. I'm running a 450HP 383. I run out of gas quick after about 6 seconds, fuel pressure drops to <2psi.

Option 1) Braided Line
Option 2) Keep the 5/16 line and run Electric Fuel Pump run at a higher PSI, I've heard that this might get me close to 3/8 in terms of fuel delivered.
Option 3) ???

Any help appreciated.

Thanks!
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post #2 of 17 (permalink) Old Jan 5th, 19, 12:33 PM
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Option 1. Thinking about doing this myself on my 4-door ‘66.
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post #3 of 17 (permalink) Old Jan 5th, 19, 1:39 PM
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Re: 5/16 Fuel Line Upgrade - 4 Door

Can you buy the line for a 2-door car and just graft in a longer section to the middle? Might be the easiest solution.
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post #4 of 17 (permalink) Old Jan 6th, 19, 2:37 AM
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Re: 5/16 Fuel Line Upgrade - 4 Door

Option 3- Bend some 3/8 inch aluminum line, and zip tie it to the original hard steel lines every 12 inches or so. It wont rattle/vibrate that way. Did that in my wagon, been 15 years now...
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post #5 of 17 (permalink) Old Jan 6th, 19, 4:37 AM
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Re: 5/16 Fuel Line Upgrade - 4 Door

in order to actually change out the line you have to lift the body. this usually leads leads to adventures with the body mount bolts. I would buy a couple sticks of the copper-nickle line and make your own. you'll need to change the pick-up in the tank to 3/8 also along with the fuel.

I wonder if you've got a bum fuel pump. There's many cars out there running a bigger engine for longer than 6 secs without issue, mine being one of them.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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post #6 of 17 (permalink) Old Jan 6th, 19, 11:32 AM Thread Starter
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Re: 5/16 Fuel Line Upgrade - 4 Door

thanks everyone. the fuel pump is a new Carter 120GPH. I had this same problem with an old 377 I had in the car a few years back, that engine would stall on the Dyno. Common element my fuel line and gas tank. I have planned on replacing the body bushings as the next project anyway, I thought while off I'll just clean the frame and replace the fuel line.
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post #7 of 17 (permalink) Old Jan 6th, 19, 8:22 PM
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I bought a roll of copper nickel 3/8" and 5/16" and ran my own lines. But for future reference 2 Dr and 4 Dr use the same frame/same wheelbase.

*Jeff*

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post #8 of 17 (permalink) Old Jan 6th, 19, 8:56 PM
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Re: 5/16 Fuel Line Upgrade - 4 Door

Agree with the last post. Two door and four door use the same frame. Wagons and El Caminos are a little longer from rear axle back.
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post #9 of 17 (permalink) Old Jan 6th, 19, 8:58 PM
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Re: 5/16 Fuel Line Upgrade - 4 Door

I ran braided PTFE -6 feed and return for EFI. Wasn't that difficult.

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post #10 of 17 (permalink) Old Jan 6th, 19, 11:29 PM Thread Starter
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Re: 5/16 Fuel Line Upgrade - 4 Door

Quote:
Originally Posted by Chevycollecter View Post
Agree with the last post. Two door and four-door use the same frame. Wagons and El Caminos are a little longer from rear axle back.
Actually, they are not the wheelbase is 4 inches longer (116 on the 4-door vs 112 on the coupe), found that out when replacing my brake lines. You can see the specs here: 1971 Chevelle Dimensions and Weights

I was wondering if I could use the elcamino fuel line since it shares the same 116 WB.

I just found this reference on frames. Chevelle Frames
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post #11 of 17 (permalink) Old Jan 7th, 19, 1:44 AM
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Re: 5/16 Fuel Line Upgrade - 4 Door

what year is the car. 64-67 cars all use the same wheel base, 68-72 cars changed wheel base between 2 door, 4 door etc
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post #12 of 17 (permalink) Old Jan 7th, 19, 6:22 AM
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Re: 5/16 Fuel Line Upgrade - 4 Door

Before replacing the fuel line, remove your tank and pickup, then remove the mesh sock on the pickup and install a good in-line filter between tank and pump. Sometimes the mesh sock on the pickup gets partially clogged with rust, sediment, etc., when the engine is running under load.

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post #13 of 17 (permalink) Old Jan 7th, 19, 7:33 AM
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Re: 5/16 Fuel Line Upgrade - 4 Door

What Von said if you haven't already done this.

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post #14 of 17 (permalink) Old Jan 7th, 19, 7:45 PM Thread Starter
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Re: 5/16 Fuel Line Upgrade - 4 Door

Quote:
Originally Posted by dell72 View Post
what year is the car. 64-67 cars all use the same wheel base, 68-72 cars changed wheel base between 2 door, 4 door etc
1971, 4-Door Hard Top (no post)
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post #15 of 17 (permalink) Old Jan 7th, 19, 7:47 PM Thread Starter
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Re: 5/16 Fuel Line Upgrade - 4 Door

Quote:
Originally Posted by von View Post
Before replacing the fuel line, remove your tank and pickup, then remove the mesh sock on the pickup and install a good in-line filter between tank and pump. Sometimes the mesh sock on the pickup gets partially clogged with rust, sediment, etc., when the engine is running under load.
Thanks Von, I'm actually going to be swapping out the body mounts anyway, I wanted to upgrade the line and tank while I had the body off the frame, just wasn't sure the best path to take. I contacted Right Stuff (they are local to Columbus/Jegs), they said they could make me a custom line with 3/8 tubing for my 4 door.
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