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Mdj

TrailBoss
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Reply with quote  #1 
Need a regulator that has a return and is adjustable, needs to operate around 50 psi. Anyone know of a brand that is reasonable priced?
94Blazer

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Reply with quote  #2 

What are you tring to do? If you are retro fittin FI on somthing it should have a regulator on the fuel rail or close to it


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abennett

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, Heeps & Shine how I ROLL.
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Reply with quote  #3 
Mike I'm just a few minutes from Summit here in Atlanta, if find anything you want I'd would be more than happy to pick it up for you, These are just a couple from the first page, I'm sure their are plenty more maybe so cheaper 
 http://www.summitracing.com/parts/AEI-13301/
http://www.summitracing.com/parts/AEI-13109/

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Mdj

TrailBoss
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Reply with quote  #4 
"97" 4.0 into a "78" cj. Grand Cherokee has regulator built into sending unit at tank(no return line)cannot use in my fuel cell.
94Blazer

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Reply with quote  #5 
Leave it up to Jeep for some sh!t like that.....
Why cant you make one out of a ball valve and a fuel pressure guage?

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Mdj

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Reply with quote  #6 
That would make a flow regulator not a pressure regulator
94Blazer

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Reply with quote  #7 

The pressure regulator on my fuel rail is a bolt and a quarter size piece of steelin a housing. Works just like a globe valve would. Crank the bolt down and make more pressure. But mine is hooked on the return side. you say theres no way to hook up a return to the tank? This engine doesnt need more than 40 psi durning the powerband? Seems like the pressure should fluctuate from idle to wide open throttle. Im prob not helping you at all , I dunno crap about mopar FI


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Brent

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Reply with quote  #8 
try a filter for a 2000 Grand Cherokee W/4.0, it is a regulator/filter all in one & should work for ya.

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Reply with quote  #9 

My question is how does it work off the same pressure all the time? Is the 4.0 computer capible of controling the pressure through voltage? I would think the top end would be kinda turdy or the low end would be rich if you ran off the same presure all the time. Am I wrong here?


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Mdj

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Reply with quote  #10 
Pressure is constant. Injector open time is controlled by computer to handle fuel demand.
94Blazer

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Reply with quote  #11 

Well I guess we all learned somthing today.


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Bruce

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Reply with quote  #12 
Quote:
Originally Posted by 94Blazer

My question is how does it work off the same pressure all the time? Is the 4.0 computer capible of controling the pressure through voltage? I would think the top end would be kinda turdy or the low end would be rich if you ran off the same presure all the time. Am I wrong here?

 Every FI motor I have ever worked on the pressure is constant, except you get a little change with vacuum. Even on returnless systems the pump is on and the regulator limits the pressure.
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Reply with quote  #13 

TPI fluctuates (spelling?) 10 psi between idle and WOT. Its done through vac. But no reason it couldnt be done through pump voltage if ECM was prgramed to do it that way. Neither here nor there .


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94Blazer

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Reply with quote  #14 

It has a baseline pressure  and it changes a little depending on how far you got your foot in the intake. I was having a hard time understanding how the engine made fuel pressure changes and I guess it doesnt.


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jdabbs

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Reply with quote  #15 
alot of late model cars/trucks have a single fuel line.  like said, fuel press. is controlled throught the pump bypass. 

I have a 97 grand cherokee tank and pump if you need it.

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