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Re: 1971 Challenger Gas Cap Question
[Re: JAK]
#1231171
05/10/12 05:36 PM
05/10/12 05:36 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Pressure vaccum, if the car is running right don't worry about the pressure. Means your fuel system is tight, imo. I get pressure sometimes depending on the temperture and both my cars are vented just like the factory vented them. A vented fuel cap will leak down the side of a challenger. I'm sure lot's of guys here have done it and it's not pretty. 71 factory service manual.  74 FSM. 
Last edited by Challenger 1; 05/10/12 06:15 PM.
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Re: 1971 Challenger Gas Cap Question
[Re: Steve340]
#1231175
05/24/12 07:12 PM
05/24/12 07:12 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
If you have the 4 tube tank system, you should not have any pressure build up. If you do, then your vent line going to the engine is plugged or pinched. My 70 Duster with that system (California car w/ECS) had the same problem and when I took off the vent line at the crankcase breather, it was plugged up.
It is normal to have pressure in the tank some days.
Depending on a lot of things, a 1/4 pound of pressure will seem like alot when you open the cap. The cap will hold up to pound of pressure.
The system is a vapor saver system, it's not meant to constantly to be vented to the atmosphere where you would have no pressure in the tank at all times.
I'm not talking about 1970 models
I understand how it's goes togeather and plumbed on each year car. My 71 car is a N-95 car and it is exactly like it was when new, even the stuff on the firewall and speedo sending unit.
Last edited by Challenger 1; 05/24/12 07:18 PM.
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Re: 1971 Challenger Gas Cap Question
[Re: Steve340]
#1231177
05/29/12 12:50 PM
05/29/12 12:50 PM
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Joined: Feb 2012
Posts: 201
Waterford, MI
JAK
OP
enthusiast
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OP
enthusiast
Joined: Feb 2012
Posts: 201
Waterford, MI
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Quote:
If you have the 4 tube tank system, you should not have any pressure build up. If you do, then your vent line going to the engine is plugged or pinched. My 70 Duster with that system (California car w/ECS) had the same problem and when I took off the vent line at the crankcase breather, it was plugged up.
My hard metal line was plugged when I removed the rubber hose going to the crankcase breather.
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