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Member Since 08 Jun 2017
Offline Last Active May 17 2018 10:38 AM

#1501915 1969 Gas Tank Venting

Posted by Wooger on 08 July 2017 - 07:52 PM

Is it venting through the cap. Also I thought the 68/69 vented through the cap hence none of the other crap. Shit I am wondering.

Pretty sure the cap that's on right now is not venting, big "non vented" printed on it haha. Will keep you guys posted once I get back on the road. The intake manifold is currently off on the ka while I'm changing out the heater hoses.

#1501456 1969 Gas Tank Venting

Posted by Wooger on 07 July 2017 - 10:49 AM

Now that i think about it, if my gas tank is not vented correctly (in its current state), would it create a sort of vacuum that would lower my fuel pressure under load?  The reason I'm asking is my fuel pressure will sporadically drop significantly when i get on the throttle which leads to hesitation and bucking.  My first thought was fuel slosh and a surge tank or sump set-up was in order, but now I'm thinking the bad gas tank venting is affecting my fuel pressure.  Perhaps air isn't entering the tank at a fast enough rate to replace the fuel that is being consumed? But if that was the case i wouldn't be able to explain why the tank hasn't collapsed yet. Thoughts?  Appreciate the insight everyone.