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94Blazer

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Reply with quote  #16 

I dont understand how you can regulate fuel pressure on a single line system with out regulating flow


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Bruce

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Reply with quote  #17 

I guess it would have to stop flow until the pressure on the fuel rail side of the line drops below a certain pressure. I haven't looked to see how exactly they work, but there are several cars that have returnless systems.

94Blazer

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Reply with quote  #18 

Would that not be  doing the same thing as a ball/globe valve would?


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Bruce

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Reply with quote  #19 
A ball valve is manually controlled. So all it would do is regulate flow, not presssure.

I just looked and they are setup like dabbs said. They have a bypass in the tank.
94Blazer

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Reply with quote  #20 
This is what Im talking about. And I dont see why a ball valve would not work since its supposed to be a constant pressure at the rail and doesnt change. Wouldnt restrict flow. out of reuglator put dump through return in the fuel cell. Would be cheap as well



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Bruce

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Reply with quote  #21 
Fuel pumps are capable of 100+psi, so you need a regulator between the pump and fuel rail. A ball valve is not going to keep the pressure down, it will control flow only. In your diagram you have a regulator, I see no ball valve.
94Blazer

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Reply with quote  #22 

Im calling BS. A Ball valve is esentally a regulator. Where I have the reg in the picture is where you put the valve. What I have done here is made a 1 line system into a 2 line system. You can put a gate or ball valve in the return side and the more you close it or open it will control pressure if plumbed the way I have it drawn out. I have done it with my truck while testing my pump and regulator. Hook your fuel pressure guage into the test port in the fuel rail , turn on your pump  , and adjust pressure at the valve. When you get it where you want it your done. It will not restrict flow to the injectors because everything forward of the tee is basically part of the rail. I dont see any other way of doing this other than using the factory pump with the bypass


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Bruce

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Reply with quote  #23 
OK I see what you are saying, but once you have it set at idle, what happens when you are at WOT and need more fuel?
94Blazer

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Reply with quote  #24 

From what Im gathering from yall car techs , it doesnt call for more pressure like I asked about earlier. The way yall have explained it to me is the computer makes the injector pulse wider at WOT. Thats why I was asking that question in the earlier post. I dont know how a 4.0 powerband works but if the pressure doesnt fluctuate, then thats all I can come up with


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Reply with quote  #25 
Lets say we set up a system like you described and set the ball valve to bypass enough fuel to keep the pressure at the fuel rail down to 45psi. Then we drive it WOT, now we need more flow at the rail to keep the pressure up, but we are still bypassing the same amount through the ball valve, but at WOT we need to bypass less. A regulator has a diaphragm in it that constantly moves to keep the pressure where it needs to be. A ball valve can't do that.
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Reply with quote  #26 
Oh, and a vacuum operated regulator doesn't just increase the pressure at WOT, it increases it whenever the vacuum drops. When you open the throttle quickly, you don't have to go wide open, the vacuum drops. This raises the fuel pressure so that more fuel gets squirted into the cylinders. With out this feature you would have horrible throttle response.

The vacuum feature does the same job as the accelerator pump on a carb.
94Blazer

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Reply with quote  #27 

I see what you are saying. If you had a pretty hot pump it could keep up I would think though. But if you plumb the regulator into a single pressure line I dont see how it could work with out some sort of a return. It would depend on what FPM the engine called for and what FPM you pump was capible of. Seemed to me if your pump was capible of more FPM than your engine called for , you wouldnt need a diaphram style reg. What about a Air pressure reg with a tee style adjustment ? Would that not do what you need?


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94Blazer

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Reply with quote  #28 

*That should be GPM*


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Bruce

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Reply with quote  #29 
Lets look at it this way. Lets say you have a 120 gph pump so that is 2 gpm, but youre engine only needs 0.5 gpm at idle. So with the ball valve you are bypassing 1.5 gpm. Now at WOT 4k rpm you need 1 gpm to feed the motor, but the valve is still bypassing 1.5 gpm.
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Reply with quote  #30 
Here are the only 2 returnless regulators Summit shows, they are $120 and $130
1 has a vacuum port and the other doesn't

Summit

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