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 Post subject: Fuel Rail Question
PostPosted: Tue Apr 23, 2019 12:47 pm 
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Joined: Tue Jun 07, 2011 11:29 am
Posts: 18
Location: Montana USA
I turboed my 93 Suzuki swift GT and I want to up the boost a bit. I've got the turbo chip from gtaye in it and have recently put in a 255 Walbro pump in it. It's got the stock fuel rail on it and I want to put a Aeromotive boost referencing fuel regulator on it but don't know how to disable the regulator that's in the stock rail. I'm thinking that I should just build a new rail out of some aluminum square stock and have just the inlet on the end going to the four injectors and run the bypass off the regulator back to the tank return line. There is a vacuum line on the stock rail that I'm not sure of what it does. Any help would be appreciated. Thanks.


Ken...........


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 Post subject: Re: Fuel Rail Question
PostPosted: Tue Apr 23, 2019 4:51 pm 
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Joined: Mon Oct 12, 2015 11:30 am
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Location: Napier
Not usually a vacuum line, sure its not the return??

Unscrew the old regulator and screw in the new one, calibrate and tune/test etc, sweet as mate!

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 Post subject: Re: Fuel Rail Question
PostPosted: Tue Apr 23, 2019 7:41 pm 
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The simplest way is to put the aftermarket reg in line after the stock reg. Because a rising rate reg will hold higher pressure than the stock reg it isn't an issue - the stock reg becomes redundant.

Because the factory reg is integrated into the rail, your other option is an aftermarket billet rail. DMW Dave might still have a few kicking around.

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 Post subject: Re: Fuel Rail Question
PostPosted: Tue Apr 23, 2019 8:16 pm 
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Location: Napier
Ah, built in. Troublesome! Could you cut it off, drill out and tap?

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 Post subject: Re: Fuel Rail Question
PostPosted: Tue Apr 23, 2019 9:42 pm 
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Location: NZ
Ok I’m not boosted however I know a thing or two about the fuel rails.
Yes the original reg becomes redundant with a higher pressure being controlled by the new FPR but I believe it still works.
However...it’s nice to get rid of it altogether....i didn’t want the stock reg working at all. And it does up to its max pressure....then the new fpr kicks in....I know because to raise the fuel pressure by two pounds when I had the stock ecu it only took a Nats cock of adjustment off completely open on the new fpr to achieve. Now with a new fuel rail the fpr was adjusted correctly to do the entire 43psi.
The line on top is vac ref. You need it to help control pressure with changes in manifold pressure. Route to a vac source on your inlet manifold.


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 Post subject: Re: Fuel Rail Question
PostPosted: Tue Apr 23, 2019 9:51 pm 
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Joined: Mon Dec 19, 2016 10:40 am
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Location: NZ
By the way....run the return off the fuel rail and not the fpr....there are two types of fpr. One is where the fpr controls pressure holding constant pressure on the fuel rail from the pump but from reading about this it appears it’s not a reliable way to maintain constant pressure....and the other type is to route the return line from the rail through the fpr and the fpr raises the pressure based on restricting the return to the tank is is the way you see mine set up....apparently it’s the best way to do it....


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 Post subject: Re: Fuel Rail Question
PostPosted: Wed Apr 24, 2019 1:54 am 
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Joined: Tue Jun 07, 2011 11:29 am
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Location: Montana USA
Thanks for the info guys. I think I'm going to get a blank rail and build my own. I'm trying tyo make this look nice and that stock rail just doesn't do it for me.

Ken........


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 Post subject: Re: Fuel Rail Question
PostPosted: Wed Apr 24, 2019 2:28 am 
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Joined: Mon Dec 19, 2016 10:40 am
Posts: 876
Location: NZ
go to Rossmachineracing....all one word. I got it from ebay. The fuel rail in my pics. Then use Russell orb port fittings to make it the same as above. Works bloody well. Or you could use weld in fittings. Get the right size drill for your injectors and make the final cut with a reamer if you can as the seals need to uh...seal.


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