indyfansd Posted October 24, 2012 Report Share Posted October 24, 2012 found this line capped on my 73 620 it runs from front of truck to somewhere on back located right under brake booster any idea? Quote Link to comment
datzenmike Posted October 24, 2012 Report Share Posted October 24, 2012 Likely the fuel tank vent. It should go to the flow guide valve on the lower left inner fender. The guide valve should have a hose going to the crank case vent tube that comes straight out of the block between the exhaust pipes and below the intake and another up to the air filter. Quote Link to comment
indyfansd Posted October 24, 2012 Author Report Share Posted October 24, 2012 my 620 has no valve as i see where it is supposed to be mounted, anywhere to source one? and am i fine to run without it Quote Link to comment
datzenmike Posted October 24, 2012 Report Share Posted October 24, 2012 Sure it will run fine. It was a way to reduce evaporated gas fumes (hydrocarbons) from entering the atmosphere by sucking them into the PCV valve and burning them. This only worked while the engine was running. Later models had a carbon canister that would store fumes for extended times when the motor was not running. On start up the fumes could be retrieved and burned. 1 Quote Link to comment
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