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- The 1967 - 1972 Chevrolet & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=3)

- - 72 gas line question (https://67-72chevytrucks.com/vboard/showthread.php?t=545251)

68350

09-29-2012 12:38 PM

72 gas line question

Can I plug one of the gas lines on my 72? It has the two line emissions one currently, but my new holley fuel pump is a one line. thanks

68350

10-01-2012 01:00 PM

Re: 72 gas line question

ttt

Lee H

10-01-2012 02:16 PM

Re: 72 gas line question

72 has 3 lines, main feed to the pump, one return from the pump, and one emission to the charcoal canister. You could plug the return and the canister line. With the return line inop, you run the risk of vapor lock in hot weather.
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68350

10-01-2012 03:47 PM

Re: 72 gas line question

How do the earlier ones work without the return?
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Lee H

10-01-2012 05:45 PM

Re: 72 gas line question

They didn't and were prone to vapor lock. A return line was one of the ways GM dealt with vapor lock issues.
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68350

10-01-2012 06:40 PM

Re: 72 gas line question

Ok thanks for your help
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