Holley 12-841 4.5-9 PSI Adjustable Bypass Billet Fuel Pressure Regulator with 3/8" NTP Ports , Black

• Carbureted Applications
• Bypass Style
• Adjustable 4.5-9PSI
• 3/8" NPT Ports
• Used in systems with a return lineback to tank

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• Question : What is the material of the fuel pressure regulator?
  Answer : The fuel pressure regulator is made of 6061-T6 billet aluminum.
• Question : Is the fuel pressure regulator resistant to corrosion?
  Answer : Yes, it features a black bright dip anodized body and a clear bright dip anodized top for corrosion resistance and good looks.
• Question : What is the adjustable range of the fuel pressure regulator?
  Answer : The fuel pressure regulator is adjustable from 4.5-9 psi for precise fuel pressure adjustments.
• Question : Will this regulate a stock efi fuel pump at around 60 psi down to 7ish psi for a carb
  Answer : It will as long as your running a large enough fuel return line if it's too small it will stay at constant fuel pressure that you won't be able to regulate
• Question : Can this regulator be used on a carburated engine with a mechanical pump?
  Answer : Yes although I use mine with an electrical pump but the principle should be the same. The Holley FPR will regulate your pressure while the return line port will help to control the pulses of the pump. Not sure though how much PSI your mechanical pump produces. If it is a low psi pump, you might not be able to make full use of the return line. Hope this helps.
• Question : I have dual float bowls on a 850 double pumper card on a 700hp engine. Will this flow enough fuel with just one outlet?
  Answer : I have same set-up.. using 8an fuel line and it works just fine
• Question : which direction since both horizontal ports are marked i/o which is in and out no arrow
  Answer : These are interchangeable. As long as the return line is plumbed correctly and the pressure is set correctly the horizontal ports will have correct pressure on both sides.
• Question : Is this a return style regulator?
  Answer : Yes it is but you'll have to run a 1/2 inch return line to make it work. I had a problem there are no stock that size on my tank. I tried it anyway with a 3/8 inch line. It will not change the fuel pressure from what the pump is delivering.
• Question : Will this regulator adjust to 2.5 - 3.0 pounds using a 9 psi electric fuel pump?
  Answer : No. Thank you.
• Question : Does it come with the mounting bracket?
  Answer : YES, IT COMES WITH A MOUNTING BRACKET