V8Freak Posted February 28, 2014 Share Posted February 28, 2014 So I was going too order a fuel tank today and apparently there were different options? He asked if I had 2,3 or no vent lines? [you said a naughty!] lol, so I look at opgi websites and there's two different options: W/o EEC 3 vent w/EEC Can anyone clarify this for me? Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted February 28, 2014 Share Posted February 28, 2014 I am pretty sure that the 3 vent is for non vented gas cap. The 3 vent were used in 72. The tanks with a vented cap sometimes leave a trail of gas during launch. I run the 3 vent with 2 capped off and the other vents the tank. I am going to change to a 1/2 inch vent with a roll over valve when I sump the tank. Quote Link to comment Share on other sites More sharing options...
V8Freak Posted February 28, 2014 Author Share Posted February 28, 2014 Where would it vent too some sort of charcoal canister? I'm not really sure what I had I ripped this thing apart 7 years ago Quote Link to comment Share on other sites More sharing options...
Murphy Posted February 28, 2014 Share Posted February 28, 2014 2 vents went to a canister behind the backseat which then had a line to charcoal canister left of the radiator & 1 vent was to the fuel pump. That's how my 71 was setup (built May 1971) Quote Link to comment Share on other sites More sharing options...
V8Freak Posted February 28, 2014 Author Share Posted February 28, 2014 I don't remember what at all, I don't recall having anything like that, I have another 70 sitting buried in the snow I may have too go back and dig it out and take a peak Quote Link to comment Share on other sites More sharing options...
footballubet Posted February 28, 2014 Share Posted February 28, 2014 70 had a vented tank where the vapors escaped out the vented gas cap. 71-72 had the EEC system with the tank behind the seat and a charcoal canister. If you have eliminated the canister and all the lines you can go with a 70 tank w/o EEC but make sure you use a 70 vented cap. I removed all the extra stuff on mine and blocked off the extra vents and went with the vented gas cap with no issue. Quote Link to comment Share on other sites More sharing options...
V8Freak Posted February 28, 2014 Author Share Posted February 28, 2014 My car is a 70 anyways so a non vented tank would be correct for my car? Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted February 28, 2014 Share Posted February 28, 2014 correct, you don't need a vented tank anyway, just a vented fuel cap for a no vent tank Quote Link to comment Share on other sites More sharing options...
jrod Posted April 14, 2014 Share Posted April 14, 2014 I need some help. I have a non vented tank with a vented cap. When I open cap it is under high pressure.. This is a new tank from opgi. I had to replace it cause the original tank had a hole at the top, and when I filled up, gas fumes filled the car. Side by side the tanks look the same. No vent tubes. Previously, the fuel pump had to be changed. The fuel pump had only one line, but there were two lines coming from the tank. Based on other post the second line is a return line. I got a new pump with both lines. now everything is connected back up. Quote Link to comment Share on other sites More sharing options...
overdrive Posted April 14, 2014 Share Posted April 14, 2014 Welcome to the site! From what you posted, your vented cap isn't venting anything. A vented cap that's working will let the inner tank be open to the atmosphere. No pressure build up. Also, there was actually 2 different systems used for 1970. The non-vented tank with the vented cap for cars delivered everywhere except CA. The California cars had a carbon canister mounted on the frame, not on the radiator support. In '71 it was moved to the support and all Montes got them. I'm not versed in how the '70 Canadian cars were equipped, but my guess is they had no canister. Dan Quote Link to comment Share on other sites More sharing options...
stangeba Posted April 14, 2014 Share Posted April 14, 2014 My 71 has all kinds of tubes and canisters and stuff. If your interested here are a few pics and a page from my 71 shop manual. BTW, a shop manual is a great item to have! Bruce 71 fuel tank pics Quote Link to comment Share on other sites More sharing options...
Rock Posted April 14, 2014 Share Posted April 14, 2014 Mine was from California as I had the canister under the hood. I deleted it. Quote Link to comment Share on other sites More sharing options...
jrod Posted April 15, 2014 Share Posted April 15, 2014 Thx for the response. The funny thing is, is that I have 2 new vented caps, and the issue is happening on both. I guess I need to have them tested to see if they are working properly. I believe they should open up at 10psi.. If they test good, then I'm back to square one. Joe Quote Link to comment Share on other sites More sharing options...
jrod Posted April 15, 2014 Share Posted April 15, 2014 Forgot to add, it's a 70 with a 72 front end.. I bought it this way a few years back. Trying to get it running again. It sat for over 10 years. Non vented tank. The sending unit has two lines a supply and return. Quote Link to comment Share on other sites More sharing options...
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