Re: Fuel vent line question
[Re: JohnH]
#1293453
08/29/12 03:03 PM
08/29/12 03:03 PM
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Joined: Aug 2006
Posts: 352
McHenry, Illinois
RAUPLEMINZE454
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McHenry, Illinois
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Quote:
I bought stainless steel, pre bent, very nice from in line tube. They both run side by side, and hooks to the fuel filter. 
The car has subframes installed, it is quite difficult trying to install the prebent line with them in the way. Even with a splice.
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Re: Fuel vent line question
[Re: Challenger 1]
#1293454
08/29/12 03:06 PM
08/29/12 03:06 PM
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McHenry, Illinois
RAUPLEMINZE454
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Quote:
That's not a vent line and it's 1/4" not 5/16"
It's a return line and can't be used for a vent line because it will fill with gas and run out.
The vent line is totally separate and setup with a vapor separator to keep liquid fuel from running out the vent line.
Here is the one that I have, could have sworn it measured 3/8" on supply and 5/16" on return. Where exactly is the return going to?
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Re: Fuel vent line question
[Re: RAUPLEMINZE454]
#1293455
08/29/12 03:31 PM
08/29/12 03:31 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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To where ever you want it too. Return lines were only used on hemi and 440/6packs but is a good idea for todays fuel systems and gas. The sending unit has it there for a return, many different ways to use it, one would be with the factory vapor separator that mounted up by the fuel pump. Or use it with a electric fuel pump or don't use it at all and plug it. I can assure you it's not there to be used as a vent. If you filled the tank it would cover up the vent line if it was made to be a vent. Here's mine.  Found my sock off the end of the pickup rolling around inside my gas tank, fricken repos.   here's what mounts in back and keeps raw gas for leaking out your vent line. The vent line attaches to this and goes up front by the motor. After pressure washing, look how clean the concrete is.  These are all E body pictures, not sure how a A body get's run.    
Last edited by Challenger 1; 08/29/12 04:19 PM.
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Re: Fuel vent line question
[Re: Challenger 1]
#1293456
08/29/12 03:54 PM
08/29/12 03:54 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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The vent line goes from the rear vapor separator that might look like my 71 e body up to the passenger valve cover and connects to the breather/oil fill. My pictures above are 72 and up, I also have a 71 which is below.  3 lines, 3/8 suction, 1/4" return and 1/4" vent line.  Here's how my fuell ines went by my connectors, I bet you wish you had my little wimpy azz connectors now? They work great for me, don't really believe you need those huge 2X3" connectors unless it was a full on race car then I wouldn't be using factory fuel lines or tanks. Hope some of this helps. 
Last edited by Challenger 1; 08/29/12 04:03 PM.
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Re: Fuel vent line question
[Re: RAUPLEMINZE454]
#1293458
08/29/12 07:44 PM
08/29/12 07:44 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Quote:
The fuel set up will be for a carbed 360 v8. Here is a pick of the sub frame/obstacle.
The demon was originally a S6 car with the extra lines coming off of the tank and the cylinder mounted in the trunk with lines going to it.
They used the same stuff for V-8s and there's nothing wrong with stock if your using a stock tank. Otherwise it won't be vented properly in all angles that you will park your car.
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Re: Fuel vent line question
[Re: RAUPLEMINZE454]
#1293462
09/25/12 05:54 PM
09/25/12 05:54 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Quote:
So I could just cap the return port off of the sending unit and run an inline fuel filter under the car and be fine as long as I use a vented fuel cap?
No you won't be fine. The filter don't go in front of the pump for one.
And no car since 1970 has been designed for a vented gas cap I don't think. Because if it was you would be smeeling gas in your garage or when the temps climb and your tank vents.
I'm sure his 71 demon is not going to be "OK" with a vented gas cap unless he's OK with gas smell and gas leaking down his quarter panel when the tank is full.
Sorry JohnH but your wrong even if it works for you, more power to ya. But please don't give bad advise.
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Re: Fuel vent line question
[Re: Challenger 1]
#1293464
11/12/12 04:13 PM
11/12/12 04:13 PM
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Joined: Aug 2006
Posts: 352
McHenry, Illinois
RAUPLEMINZE454
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Quote:
Quote:
So I could just cap the return port off of the sending unit and run an inline fuel filter under the car and be fine as long as I use a vented fuel cap?
No you won't be fine. The filter don't go in front of the pump for one.
And no car since 1970 has been designed for a vented gas cap I don't think. Because if it was you would be smeeling gas in your garage or when the temps climb and your tank vents.
I'm sure his 71 demon is not going to be "OK" with a vented gas cap unless he's OK with gas smell and gas leaking down his quarter panel when the tank is full.
Sorry JohnH but your wrong even if it works for you, more power to ya. But please don't give bad advise.
Challenger,
I had to pick out a fuel pump andnow that I have done that I am looingto set up the fuel system. You seem to be pretty knowledgable and I was hoping you could help advise me.
Starting at the engine I have this mechanical carter with 1/4 npt connections:
http://www.summitracing.com/parts/crt-m6902
I am hoping to run a 6an line for both supply and return. At the other end I will be connection to a factory style sending unit with the return port.
And here are pics of the new fuel tank and some sort of factory "tube":
I already know that the sending unit has to use a compression to AN adapter, and that the adapter at the fuel pump will be 1/4 npt to AN. How many lines am I running for a carb set up? And where does the return line go in the engine bay?
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Re: Fuel vent line question
[Re: RAUPLEMINZE454]
#1293465
11/12/12 06:03 PM
11/12/12 06:03 PM
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Joined: Feb 2004
Posts: 1,012
indiana
mcmopars
super stock
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Joined: Feb 2004
Posts: 1,012
indiana
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Quote:
The fuel set up will be for a carbed 360 v8. Here is a pick of the sub frame/obstacle.
The demon was originally a S6 car with the extra lines coming off of the tank and the cylinder mounted in the trunk with lines going to it.
really clean,nice job.
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Re: Fuel vent line question
[Re: RAUPLEMINZE454]
#1293466
11/16/12 10:49 AM
11/16/12 10:49 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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Hello, Those 4 nipples on the tank are all vent lines that connect to the vapor separator that mounts in the trunk. The 5th nipple on the vapor separater connects to a line that runs up to the engine compartment. Yours is a 71 I believe so it connects to the breather(3 nipple) on the passenger valve cover. The return line usually runs from the sending unit up to the engine compartment and it ends by the fuel pump up front. So can be connected to a factory vapor separator that is usually bolted to the fuel pump up front. Now if your not going to use a factory separator up front and are going to use a some kind of regulator with a return line then you may want to run it elsewhere in the engine compartment. Using a #6 to feed it is OK and a #6 return is ok also imo. I would rather use standand steel tubing instead of braided line becuase it's cheaper and will last longer. Having all that rubber hose in front of the fuel pump is not a great idea, imo. Less fittings, less chance of leaks with steel line verses braided rubber hose, imo. You only need 5/16' line on the discharge side of the pump feeding the carb. Hope this makes sense and helps. 
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Re: Fuel vent line question
[Re: Challenger 1]
#1293467
12/07/12 02:28 AM
12/07/12 02:28 AM
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Joined: Aug 2006
Posts: 352
McHenry, Illinois
RAUPLEMINZE454
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Quote:
Hello,
Those 4 nipples on the tank are all vent lines that connect to the vapor separator that mounts in the trunk. The 5th nipple on the vapor separater connects to a line that runs up to the engine compartment. Yours is a 71 I believe so it connects to the breather(3 nipple) on the passenger valve cover.
The return line usually runs from the sending unit up to the engine compartment and it ends by the fuel pump up front. So can be connected to a factory vapor separator that is usually bolted to the fuel pump up front.
Now if your not going to use a factory separator up front and are going to use a some kind of regulator with a return line then you may want to run it elsewhere in the engine compartment.
Using a #6 to feed it is OK and a #6 return is ok also imo. I would rather use standand steel tubing instead of braided line becuase it's cheaper and will last longer. Having all that rubber hose in front of the fuel pump is not a great idea, imo. Less fittings, less chance of leaks with steel line verses braided rubber hose, imo. You only need 5/16' line on the discharge side of the pump feeding the carb.
Hope this makes sense and helps.
Thanks for the info and sorry about the delayed response. Things have been very busy and I appreciate your help. Any idea where to find a seperator? Do I have any other options than to run the 3 nipple breather on the passenger side valve cover?
Thanks,
Brian
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