First: Fuel is in the gas tank.
Second: The fuel pump pulls it out of the tank, into the fuel line, and sends it up to the engine bay.
Third: Now does the fuel go to the fuel rail, FPR, or what next?
My funds got shot, so I'm trying to figure out if an FPR is necessary to run a direct port kit. If the fuel line goes directly to the fuel rail then I shouldn't need an FPR, because the extra fuel will be pulled out of the fuel rail by the fuel solenoid.
Thanks yall

 

I believe that it goes through the factory fuel pressure regulator, which is located against the firewall on the passenger side.

then again I think I don't really know what your question is, so don't mind me... heh...

 

There is a factory fuel regulator that limits the fuel coming to the fuel rail. You would want to change an after market FPR that is adjustable... hence allowing more fuel pressure. Keep in mind, fuel PRESSURE and fuel VOLUME are different. Pressure is not an absolute substitute for volume.

 

I never thought of it like that, once agian JG Luder...

 

Thanks. Looks like I'll be buying an FPR also.

 

Here's how it goes. Fuel gets pumped out from the fuel pump. Then it goes through the fuel filter. Then it connects to the fuel rail. The FPR is mounted on the fuel rail itself. Then from the fuel rail return line, the exces fuel goes back to the fuel tank.

 

Actually, the FPR limits the fuel exiting the fuel rail via the fuel return line.

 

Ok JG said that the fuel goes through the fpr before the fuel rail and inline four said the fuel goes through the fuel rail and then the fpr. Which is right?

 

99_SH/Inlinefour is right. Fuel is pushed into the rail and the regulator on the top of the rail sends back into the tank enough fuel to regulate the pressure in the rail.

It would be easier to see with a picture, but I can't seem to find one right now.


[Modified by DirtyLude, 7:52 PM 11/13/2001]

 

Dammit! I was told on another board that the fuel went through the FPR first.
JG: will you check with your mechanic on this one for me?

 

Would you like to put money on it.

 

JG is incorrect.

 

That was a little harsh. My post was just a joke. Absolutely, get it checked out. I wouldn't believe everything I heard on the internet either.

Unfortunately all I can post is the Mitchell diagrams which are not detailed enough around the fuel rail and the parts catalog pictures are just too confusing.

 

Not really. It's the truth.

 

No offense taken. I've gotten mixed answers on both boards, so I wanted JG to check it out for me. I always thought that the fuel went to the fpr before the fuel rail, but that causes alot of tuning problems for a direct port kit. It would make more sense for the fuel to go to the fuel rail first, so I'm inclined to believe it.

 

We'll, to answer your real question, I assume you're just looking for a source for pressurized fuel.

You can tap the fuel line anywhere between the fuel filter and the rail, which is about a 1 foot long piece of flex hose that is ended with banjo fittings. If you want it to be real easy, you can get a B&M underhood fuel pressure gauge. It comes with a new fuel filter banjo bolt that has a 1/8"NPT tap in the top that you can use. If you want to be alot cheaper with more work you can drill and tap the stock bolt.

 

I'm just going to use the pre-tapped AEM fuel rail to get fuel to the fuel solenoid in the direct port kit. I thought that I'd have to increase the fuel pressure via the fpr, so that I would have enough fuel available in the fuel rail to supply the nitrous system and the fuel injectors. Now that I know that the fuel doesn't have to go through the fpr before it gets to the fuel rail, I'll just get a higher flowing fuel pump to make sure that I don't run lean when I spray.