May I run this without a return line to the fuel tank?

Yes but you would have to plug the return outlet. Make sure to use fuel friendly thread sealer. Or you can buy the Holley 12-803 regulator that comes without a return line and is a cheaper option than this. Cheers

What is the maximum flow rate through this unit?

6 psi is the highest. I’ve got mine set at 2.7 psi as it’s used on an old Ford Flathead engine and Carb.

Does it come with instructions

Yes, the Holley Bypass Regulator, Fuel Pressure 6.0 Psi, Chrome comes with instructions. The instructions are available in the product packaging or can be downloaded from the Holley website. The instructions include information on how to install the regulator, adjust the pressure, and troubleshoot any problems.

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Item Package Dimensions L x W x H	3.66 x 3.54 x 2.56 inches
Package Weight	0.31 Kilograms
Item Weight	8 ounces
Brand Name	Holley
Warranty Description	Warranty
Model Name	Holley Bypass Regulator, Fuel Pressure 6.0 Psi, Chrome
Color	Chrome
Material	Plastic
Suggested Users	unisex-adult
Number of Items	1
Manufacturer	Holley
Part Number	HOL 12-881
Included Components	Holley Bypass Regulator, Fuel Pressure 6.0 Psi, Chrome
Size	No Size

Holley Bypass Regulator, Fuel Pressure 6.0 Psi, Chrome

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