OSIAS Lightweight Adjustable Fuel Pressure Regulator 160psi Kit Universal AN6 Fitting for Car Marine EFI Systems, Black Braided Line

The Osias 6AN fuel pressure regulator was surprisingly close to the design of the Aer0m0*** design of a much higher price. Like a lot of others are saying about changing out the diaphragm (Part # 13001 rebuild kit), I have not needed to do that yet. I did however, have to loosen and retorque every screw and fitting on the regulator because they were all loose. A minor issue if you ask me. I did drill the inside orifice of the regulator to a larger size (.278") to help it regulate a higher flow fuel pump (my fuel pump is 400lph). As others have said, the fittings are not true 6AN inner diameter size. If you aren't pushing the limits of your fuel system, you will be fine. They seal just fine. If you are taxing the fuel system, you should upgrade the fittings to the true size. The straight fittings can be drilled out to the proper size, but the angled and curved fittings should be replaced with the proper inner diameter from a more expensive manufacturer. All in all, I saved probably $120 going this route and it has been running a 400hp boost referenced 58psi consistently for about 2 months now.

The regulator itself is solid! Nice and hefty and the machining isn't all that bad. However, for the price, not eveyrhing is fantastic.Replace the diaphram and the fittings with another brand. I went with aeromotive to replace the diaphram. The one that comes with it is fine but will fail shortly after. Also. Do no use any of the fittings that come with it. They're pretty bad. The openings on the orb fittings are not -6an as the ID (inside diamater) does not match what -6an calls for. The included Guage does the job. Just make sure you don't screw it off the NPT fitting or the liquid will drip out. Also cover the NPT fitting with Teflon tape before installation* It does not come with instructions so research before you buy.*the spring has a lot of tension. If you need really low fuel pressure for a carburator, make sure to grab another spring rated for your desired pressure.Total cost was much less then the similar looking name brand item.

Like everyone else says buy an aeromotive 13001 diaphram, mine wasn't holding pressure after shut off, leading to long starts. The fittings work but aren't the greatest but no issues with leaks. For what you pay it's a good deal.

The gauge fell apart but the hoses arent leaking. Luckily I had a spare gauge.

Actually I liked the regulator quite well. It was easy to mount and it comes with a number of fittings. We had to buy additional to fit our vehicle, but I would cal that normal. It is easy to adjust. Would use a check valve on the return line. It is similar to most regulators and you can find instructions online. Or you can have a brother who is a master mechanic.

great quality just hard to fine fittings for the 6an

Very please with the fit and finish. Good quality product. Running 58 psi for my Holley super sniper

Got it on and 30 minutes after setting pressure it started to leak from the set screw not to happy as I was trying to get my truck home from a friend's house

Works perfectly for the price, I wish there were a couple 180° fittings but otherwise a great product for a very reasonable cost!