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Hello. I believe the PMO regulator nedds a return line to function properly, Excess press is returned to the fuel tank, I recommend running it with a return line as the cooler fuel available to the carbs will provide more consistent metering plus reduce the chance of vapor lock, Also for adequate fuel delivery across the rpm range this setup will work much better ,
For a '70 T you should find in the area of the fuel tank outlets a fitting that will accept a return fuel line,
Hope this helps, Lou
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