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Zoltar.
Just to clear this up, if you have original unmodified '48-'50 tanks you need to run a vented cap on both tank halves. The unvented left tank cap came about with the addition of the vent crossover tubing at the top of the tank under the dash, but that didn't show up until much later (60's) along with the bottom mount petcock. I'm sure somebody will come up with the exact year it changed over.

Regards,
Geo.
 

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Just so nobody gets the wrong idea about maintaining a reliable, steady fuel flow-- you have to vent your gas tank somehow, otherwise you WILL have a problem with your fuel flow. No air coming in to equalize pressure in the tank = no fuel coming out of your fuel line. The way that was accomplished with the older tanks (pre '65?) without the crossover vent line was with a vented cap on each tank half. That also led to the problem of gas leaking thru the left tank vented cap if your tanks were all the way topped off and your bike was leaned over on the side-stand. What I'm thinking Zoltar, if your bike ran good with the '59-'60 tanks with an unvented cap on the left tank, I think either your gas cap had a bad gasket or you were sucking air thru the fuel/reserve shut off rod assembly on top of the left tank. I'm specifically talking about Harley split tanks here but this venting principle stands true for any gas tank.

Regards,
Geo.
 
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