alex bonino Posted January 21, 2009 Share Posted January 21, 2009 hello all.would I be correct in assuming that the vented cap on my 64 is incorrect, and that the fuel tank/gas cap should be of the non-vented variety, given that the first generation Riviera fuel tanks have a vent line?thanks!alexroa 11550 Link to comment Share on other sites More sharing options...
Jim65Riv Posted January 22, 2009 Share Posted January 22, 2009 Check with your local NAPA. I needed a new cap for my 65 and they had one the next day. Link to comment Share on other sites More sharing options...
TexRiv_63 Posted January 22, 2009 Share Posted January 22, 2009 My 63 has a vented cap which I believe to be original. The A/C cars have a fuel return line to the tank from the filter but its not really a vent. I don't think they went to non vented caps until the emissions laws kicked in in the 70s. Link to comment Share on other sites More sharing options...
alex bonino Posted January 22, 2009 Author Share Posted January 22, 2009 Hmm. Thats interesting. My 1964 (which also has A/C) does have the fuel return (which you mention) routed to the front, ending up at the inline fuel filter. I believe the fuel tank vent line nipple is located just to the left of the main filler neck. The hose from this nipple curves up and around the filler neck, and is attached by a couple of clips. Would they have used both a vented cap and the vent hose?alex Link to comment Share on other sites More sharing options...
TexRiv_63 Posted January 23, 2009 Share Posted January 23, 2009 You got me curious so I took a better look at my car. I was wrong, my cap is not vented and I saw the tube you describe. I assumed it was a vented cap because I was thinking of the modern style sealed cap, but there is no vent hole visible. I'm guessing this setup was to avoid gas leaks due to the filler pipe being so horizontally oriented. Lots of evidence of leakage out the vent tube on mine so it probably was not too effective. You do need a non-vented cap. Link to comment Share on other sites More sharing options...
Jim Cannon Posted January 23, 2009 Share Posted January 23, 2009 <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TexRiv_63</div><div class="ubbcode-body">You got me curious so I took a better look at my car. I was wrong, my cap is not vented and I saw the tube you describe. I assumed it was a vented cap because I was thinking of the modern style sealed cap, but there is no vent hole visible. I'm guessing this setup was to avoid gas leaks due to the filler pipe being so horizontally oriented. Lots of evidence of leakage out the vent tube on mine so it probably was not too effective. You do need a non-vented cap. </div></div>Yes, non-vented cap on 1st generation Riviera. You need Stant gas cap 10646. When the rubber gasket under the cap goes bad with age, fuel will splash out of the filler neck. Not good; replace it when it does that.The loop in the vent hose has to go pretty high. Even then, you will lose a bit of fuel out that hose when you accelerate hard. :-) Back when your gas was 35 cents a gallon, you did not mind too much. Link to comment Share on other sites More sharing options...
alex bonino Posted January 24, 2009 Author Share Posted January 24, 2009 Thanks for the confirmation, guys. I suspected I would need the non vented, but just wanted to double check.Also, FYI, based on the Buick parts manual, the GM part number for the cap is 583604 They show up on ebay fairly routinely, so I'll start watching.thanks again, Don & Jim.alexroa #11550 Link to comment Share on other sites More sharing options...
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