Fuel Pressure Regulators and setting meters?

[Nagoya_TRD.]

I just trying to learn a little more about fuel systems, but i have an idea what the regulator does. What is the point of the "setting meter" other than showing the fuel pressure?

http://www.more-japan.com/product.php?productid=16831&cat=539&page=1

http://www.more-japan.com/files/d_2736.jpg

In this case, let's talk about SARD Fuel pressure regulators and their "setting" guage.

Someone explain this part of fuel systems to me. Thank you. :redface:

[cali yaris]

The gauge shows the pressure visually so you can make adjustments quickly, without having to read it from management software, etc.

[Nagoya_TRD.]

Will this work only for the Sard FPR or others as well?

[Nexus1155]

im assuming its universal and you can tap it in anywhere....

[cali yaris]

A gauge is a gauge, as long as the fittings work. We ended up putting my gauge at the end of the fuel rail - no need for a line or a bracket that way.

[Russelt3hPirate]

The gauge shown appears to be the one used to set the fuel pressure on the dyno while tuning and not one you'd have installed constantly (or be able to view constantly since it's in the engine bay).

a standard (electronic) gauge has a sensor attached to a sending unit which then sends the data into the gauge in the cabin.

so yes there is a difference between a standard electronic fuel pressure gauge and the "setting" fuel pressure gauge.

[cali yaris]

I have a regulator (which sets the pressure) and a liquid-filled gauge off the fuel rail, in the engine bay. I'm assuming it's a mechanical gauge.

[Russelt3hPirate]

I have a regulator (which sets the pressure) and a liquid-filled gauge off the fuel rail, in the engine bay. I'm assuming it's a mechanical gauge.

yeah the gauge in the first post and link is the same idea as the one on your fuel rail.

simply for setting the fuel pressure, not for monitoring fuel pressure.

[cali yaris]

well, if you sat on the valve cover and leaned way over, mayyyybeeeee you could watch it

[Russelt3hPirate]

well, if you sat on the valve cover and leaned way over, mayyyybeeeee you could watch it

wait, you can't see yours even when the hood is up without sitting on the valve cover? :bellyroll:

what's the point if you can't see it?

[cali yaris]

Here's my set up:

http://www.microimageonline.com/images/garm/motor/FPR.jpg

[LtNoogie]

Garm, what pressure are you setting your system to at idle? Is your regulator boost compensating?

[cali yaris]

No, it's a fixed pressure. It's the injectors job to squirt the correct amount of fuel. We have it at 40 right now, but if the injectors max out we may end up with a higher pressure. Not done tuning yet!

[cdydjded]

Our cars use what called a "returnless fuel system". The regulator is in the fuel tank, not on the fuel rail. It is not adjustable. You would have to convert to a "return" fuel system to be able to adjust your fuel pressure. Unless you are running a S/C or turbo you fuel pressure does not have to be adjusted, even with all the bolts on's available for our cars.

[cdydjded]

No, it's a fixed pressure. It's the injectors job to squirt the correct amount of fuel. We have it at 40 right now, but if the injectors max out we may end up with a higher pressure. Not done tuning yet!

Your fuel pressure should not be fixed. It should be 40psi at idle & go up to 50-60psi depending on the boost you run. The regulator is a 1:1. If your pressure stays at 40psi at all RPM range then there is something wrong.

[Russelt3hPirate]

Our cars use what called a "returnless fuel system". The regulator is in the fuel tank, not on the fuel rail. It is not adjustable. You would have to convert to a "return" fuel system to be able to adjust your fuel pressure. Unless you are running a S/C or turbo you fuel pressure does not have to be adjusted, even with all the bolts on's available for our cars.

hmm, converting to a return fuel system would be entertaining.

might as well gut the car, ligthen the wiring, and re do the ENTIRE fuel system while you're at it....

research time. :bellyroll:

[cdydjded]

converting to a returnless system is common modification on the SRT4 for example. This mod for the SRT4 makes 30-35 more hp. I dont know what your comment about "gutting the car" & "ligthen the wiring" means, converting to a return system does involve " re doing the Entire fuel system" I dont need any "reseach time" Iv done this many times. I can send you a details if you want

[Russelt3hPirate]

converting to a returnless system is common modification on the SRT4 for example. This mod for the SRT4 makes 30-35 more hp. I dont know what your comment about "gutting the car" & "ligthen the wiring" means, converting to a return system does involve " re doing the Entire fuel system" I dont need any "reseach time" Iv done this many times. I can send you a details if you want

I'm interested in what's involved. It'd save me some time.

reason I said the other two things, is I'd like to do those at the same time.

[cdydjded]

OK here is a list of parts:
Fuel rail (Perrin)
Adjustable fuel pressure regulator (AEM, Aeromotive)
-6 fuel lines (any brand)
-6 fittings (any brand)
Fuel pressure gauge (any brand)

[Russelt3hPirate]

OK here is a list of parts:
Fuel rail (Perrin)
Adjustable fuel pressure regulator (AEM, Aeromotive)
-6 fuel lines (any brand)
-6 fittings (any brand)
Fuel pressure gauge (any brand)

hmm interesting.

[LtNoogie]

Our cars use what called a "returnless fuel system". The regulator is in the fuel tank, not on the fuel rail. It is not adjustable. You would have to convert to a "return" fuel system to be able to adjust your fuel pressure. Unless you are running a S/C or turbo you fuel pressure does not have to be adjusted, even with all the bolts on's available for our cars.

I have a S/C'd Yaris running tC injectors. The injectors are too big and the car throws a rich mixture CEL every time I start the car. I am thinking of getting a boost-compensated adjustable fuel regulator that I can turn down the psi until my data logger shows that the ECU is no longer struggling to trim back the fuel.

I expect that at my 6psi full boost pressure that my fuel pressure will go up 6psi and keep me at a nice AFR.

[cdydjded]

LtNoogie: you are correct that your injectors are to big. Our stock injectors are in the 190-200cc range, TC injectors are in the 350-370cc. The most you can go up in injector size without driving the computer crazy is 20%. That would be in the 230-240cc range. I feel that by adjusting your fuel pressure to compensate for running too big of an injector will not help. It would be better and less expensive to buy the correct injectors than converting to a returnless fuel system.