Fuel line question

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clhyer

clhyer

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Evening folks,
Working on a '72 Duster, swapping out the /6 for a 318. My plan is to put in new fuel line. What the '72 had was two lines; fuel and return? The YearOne catalog and web site only lists one line. What have y'all done? In the engine bay they ended in very different places, one ended at the K-frame while the other snaked it's way along the inner fender and firewall.
Thanks,
C

Duster 4-28-2008 026.jpg
 
The one that goes to the K member would be for the fuel pump and if you're going to replace it anyway I'd suggest 3/8" instead of 5/16". The line that goes up by the fender was probably for the charcoal canister to tank vent.
 
Terry,
You are correct regarding the second line going to the charcoal canister. Will I not need this line? If I do not use this, how do I vent the gas tank, or prevent vapor lock?
Second, my 318 is stock. I have no plans to race or anything. Will there be a benefit to the 3/8 line? IIRC they are the same price, so it's just getting the best parts for the job.
Thanks,
C
 
For a stock 318 and no plans to race you can stick with the stock size or upgrade if you wish. You'd have to increase the size of your pickup in the tank to take advantage of the increased fuel line size.

The other line to the cannister is for emissions. Keep it or do away with it. With a vented gas cap or vent line in the filler tube you'll be fine.
 
Right, the top line is a ECS line to the trunk canister. your 72 must be a early build, most had the canister in the engine compartment.
 
My 71 Challenger has exactly the same ECS line (Evaporaive Control System). It didn't run a charcoal cannister, it had 4 vent tubes from each corner of the fuel tank all going to a riser in the trunk. Also coming off that riser was that line you see going to the eng bay and ending opposite the RHS of the engine on the inner fender. From there, it either had a rubber hose going to the rocker cover breather cap so that PCV system could recyle it OR straight to the ECS of the carb (i can't remember which now). That carb was the factory 2barrel Holley. JUst plug that line up, but you will need to vent the fuel tank with a vented cap, is the easist way.
 
Thank you all, cheaper, cleaner, simpler.
C
 
Give www.gastank.com a try thats who i used for my lines and 3/8" pickup on my duster..not a fan of yearone or their inflated shipping charges:thumbdow::thumbdow:
 
Stroked,
I am not a fan of those charges either. I am close enough that I usually go pick up stuff at Y.O. Unfortunately, as of late it seems they don't carry what I need and it's always + shipping.
The link you gave didn't work...
C
 
Before you decide to barrel through the engine bay with cutters and line plugs, read this; it may make you want to change your mind and repair things properly.
 
clhyer said:
Terry,
You are correct regarding the second line going to the charcoal canister. Will I not need this line? If I do not use this, how do I vent the gas tank, or prevent vapor lock?
Second, my 318 is stock. I have no plans to race or anything. Will there be a benefit to the 3/8 line? IIRC they are the same price, so it's just getting the best parts for the job.
Thanks,
Click to expand...

Most of the original system is detailed in the factory shop manuals. Read both the section on fuel, and emissions. This system changed almost every year. you can download the manuals FREE from MyMopar. Some of those came from the guys here on FABO

http://www.mymopar.com/index.php?pid=31

70Duster440 said:
The other line to the cannister is for emissions. Keep it or do away with it. With a vented gas cap or vent line in the filler tube you'll be fine.
Click to expand...

If you "do away" with it you'll have to something additional for venting. PLEASE reconsider using a vented cap. That's a "quick way" to end up with paint on side of the car

In my opinion, the best way to vent a newer tank with "did away" evap lines is to construct the vent system exactly like the 69/ earlier cars did.....a vent tube in the filler neck

2cmugso.jpg


Other guys simply leave the evap line up front, and leave it "up high" so it cannot siphon. I believe the earlier cars ---70 CA only and 71--- had no carbon can...........they "teed" the vent line into the PCV breather
 
Below is a crop out of the 70 manual, chapter 9A. There was no carbon can in '70 (California only). They simply ran the vent into the breather. Whatever you do you need to do "something" for a vent
 

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He's driven it to Ney York a couple of times now, so I think he got it done.
 
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