Fuelab 51502-2 Universal Red EFI Adjustable Fuel Pressure Regulator

My only complaint is the bypass port while being 6 AN sized, is actually just over an 8th inch hole inside the body. If you're planning on using a high flow pump you might consider ordering their large seat model that doesn't seem to be available on and check their site. That said with pump volume control in place I'm able to regulate down to their published 25 psi no problem. The manufacturing is quite nice and the small touch like the adjuster screw being dished at the bottom and the seat inside on the spring having a ball pivot along with the very fine threading make for Super smooth and accurate adjustment. The unit comes wit the main regulator body and all the adjuster and nipple parts and 3 orings. You get to assemble the adjuster screw and nipple for vacuum. This is good really because it allows you the opportunity to use a bit of Teflon tape to prevent a vacuum leak. I found this unit to absorb little bit more of the pulsation from my Walbro 255lph pump than my Aeromotive 13129 contact Eli regulator did.

I bought a Fuelab regulator because my tuner recommended this brand. The first one would not regulate below 80 PSI. We adjusted it repeatedly and the fuel pressure never adjusted to a usable pressure. A few data logs and my oil was full of fuel because the pressure was so high. So I asked my tuner if he would recommend another brand. He told me to buy a second Fuelab, that sometimes there is a bad one right out of the box. Which in my opinion should never be. But I took his advice and bought a second one. This one won't adjust below 75PSI. So now I've spent $300+ for 2 paperweights when I should have bought a Holley. Fuelab is off my list of "performance" parts I am willing to spend my hard earned money on.