can this be used for outboard boat motor to tank connection?

I believe it’s perfect for it

will this collapse under vacuum? 24" HG to be exact.

Yes. You need Teflon lined or nylon hose if you're trying to pull that much vacuum.

Will it work for PCV hose? Some reviews say it collapses? Does anyone know for sure that has used it for PCV venting?

This is an automotive fuel line hose with a narrow opening it will compress and deform under pressure you can park a car on it ? that would restrict air or fuel from flowing until the weight is removed then return to original shape .....PCV will crack

ASIN	B09KRVYLMS
Best Sellers Rank	#373,066 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #102 in Lines & Hoses
Brand	dojobkinb
Brand Name	dojobkinb
Colour	Black
Customer Reviews	4.6 out of 5 stars 4,780 Reviews
Item Dimensions L x W	3.05L x 0.02W Meters
Item Length	10 Feet
Item Weight	0.62 Kilograms
Manufacturer	dojobkinb
Material	Synthetic Rubber
Material Type	Synthetic Rubber
Maximum Pressure	1160 Pound per Square Inch
Nominal Wall Thickness	3.74 millimeters
Outside Diameter	17 Millimetres
Product Dimensions	3.05L x 0.02W Meters

10 Feet NBR Fuel Line Hose Black Nylon Steel Oil Gas Fuel Line Hose 3/8 Inch Inside Diameter Suitable for Fuel Systems Engines Tube Hose

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