Fuel Regulators

[gtrkrauss]

Just wondering what some guys on here are running for Fuel Regs? Im thinking of purchasing an Aeromotive one. I know Tomei as well as Sard make good ones as well. Also are the regs run strictly off of Vacuum? Just trying to get an idea as im digging into my fuel system next week. Any info at all on Regulators or Rails is great for me. Thanks!!

[caliber676]

The basic principle of a fuel regulator is a vacuum regulated diaphragm that opens or closes based on vacuum which runs inline with the fuel system. If the engine is at idle the vacuum pushes the diaphragm further up and allows fuel to bypass the regulator this keeping the pressure lower. When throttle is used the vacuum decreases and the diaphragm is more or less closed blocking fuel flow and this increasing fuel pressure to aid in injector opening. The adjustable regulators just have a screw that adjusts the spring tension on the diaphragm aka the pressure. All the name brand regulators you mentioned are good. The aeromotive is more so for high Hp engines but would work regardless.

The fuel rail is basically a block that supplies fuel to each injector. I would choose a name brand rail for ease of install and compatibility but its just a piece of hollowed metal so some people get cheap ones. Mak sure the injector size matches the rail. Also be aware of the fuel rail ends, most are -an fittings and would require some extra fittings to match up to the stock fuel lines

What your plans for the fuel system and your engine specs?

[gtrkrauss]

its a built motor top and bottom end and a single turbo precision. The car is a fairly high horsepower car even on break in tune. It goes in for full tune in the spring. My fuel system is all sorted up to the rail and the reg. Im leaning towards the Aeromotive as it is fully adjustable and is actually better price wise then the Sard or Tomei. I just hope i dont have too much trouble setting it up so it will atleast run so i can drive it on a trailer haha. As for the rail I might take a shot in the dark with a cheaper one. If it sucks, it sucks not a huge burn as you can pick them up for around 80 bucks.

Quick question, when your hooking up your Reg should it be hooked after my fuel filter or before. I have a small inline fuel filter mounted below my intake manifold. Also, I should be able to use my existing lines to my stock rail, correct? They are braided, i would just need to upgrade to some threaded fittings on the end of them.

Thanks!

[Skym]

The vacuum to FPR does open orifice inside FPR and return more fuel to fuel tank when it's not needed which also drops fuel pressure in fuel rail (around 7.1psi less with stock FPR). But once engine transistions to boost the fuel rail needs more fuel pressure to match the boost pressure in intake manifold. Most FPR's I have seen are 1:1 (1psi fuel pressure to 1psi of boost). If there is not enough fuel pressure, the boost pressure in intake manifold can stop fuel exiting injectors. That's why you never lower fuel pressure to remove fuel (do it via ECU tune, where you close the injectors).

You usually change fuel rail if switching to dual entry fuel rail. That's when 1x fuel pump is not enough with lph and have to use 2x fuel pumps. But with 1000hp+ fuel pumps that are available a dual entry fuel rail is not needed. Also the other benefit of duel entry fuel is you can remove the stock fuel damper FPR (less to go wrong), as the fuel enters both side of rail and collides in the middle (where fuel exits a dual entry fuel rail and goes to FPR) which essentially does the same job as the stock damper FPR.

[caliber676]

its a built motor top and bottom end and a single turbo precision. The car is a fairly high horsepower car even on break in tune. It goes in for full tune in the spring. My fuel system is all sorted up to the rail and the reg. Im leaning towards the Aeromotive as it is fully adjustable and is actually better price wise then the Sard or Tomei. I just hope i dont have too much trouble setting it up so it will atleast run so i can drive it on a trailer haha. As for the rail I might take a shot in the dark with a cheaper one. If it sucks, it sucks not a huge burn as you can pick them up for around 80 bucks.

Quick question, when your hooking up your Reg should it be hooked after my fuel filter or before. I have a small inline fuel filter mounted below my intake manifold. Also, I should be able to use my existing lines to my stock rail, correct? They are braided, i would just need to upgrade to some threaded fittings on the end of them.

Thanks!

Your correct, just get the right fittings and then it should all be good. Most rails come with -6an Male outlet fittings. The aeromotive is a good regulator at a good price, personally I went with the Tomei type L. Before you swap the system find out the fuel pressure you currently have with an inline fuel pressure gauge. When you purchase a new regulator then you have a pressure you adjust to. I would get a fuel gauge for mounting on the fpr too.