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I want to make a kit so that the flow of propane is regulated by boost pressure.
My dad is a gas pressure systems operator and said he could get a regulator but needs to know the max cfm (at around 30 psi boost). Also, is 1/4" line big enough or should I go with 3/8"?
 

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A lot of fuel pressure regulators have a boost port that allows you to increase pressure fuel pressure based on boost pressure... Wonder if one of those would have fine enough control to work with propane...

I would connect an adjustable valve to my boost-referenced Cooling Mist Smart DMS, but I've already invested the $500 into that setup to make it functional.
 

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I would think that 1/4 inch line would be plenty for propane.

ATS sells a nice propane regulator setup that is boost referenced, but it is laughably expensive.

Restoring the layer structure...

For that price I'd be able to find a complete natural gas Cummins, spark plugs and all...
 
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