Fuel Pressure Regulator

It will "work" but there is no need for it unless the stock one is going out or you are running nitrous. I had a Kirban on the 95 LSC and when you up the fuel pressure the ECU would adjust it back down eventually.
 
If you upgrade your fuel pump as many do, the stock unit will fail. Its a good support pc. I have the BBK unit, nad to tweak the fuel line a little bit to fit.

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The stock regulator can handle the Walbro 255 just fine. I ran my 95 LSC with the Walbro 255 with stock regulator for over a year and over 50 track passes no problems at all..
 
Hmm. 50 passes, 1yr. How many miles?

So if the computer overrides bumping the pressure up...and the stock unit can handle the extra load...why do they exist?
 
02LSE96LSC91SE84TC said:
Hmm. 50 passes, 1yr. How many miles?

So if the computer overrides bumping the pressure up...and the stock unit can handle the extra load...why do they exist?
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To make someone rich!
 
I do have extra money to throw around. But thats not why I bought one...maybe it is...I do alot of things to just do it and be done.
 
OEM regulator here with plenty of boosted miles, lately with even more boost. There are no ill effects even with dual 255s if need be.

1:1 rising pressure regulators are not even needed now with the tuning software we use.

Of course the minute you get serious with the fuel systems say 600rwhp level it's time for big lines, big pumps and fancy regulators.
 
98LSC32V said:
It will "work" but there is no need for it unless the stock one is going out or you are running nitrous. I had a Kirban on the 95 LSC and when you up the fuel pressure the ECU would adjust it back down eventually.
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It does not "back down" from the cpu. I have used ours sucessfully for years and the higher the pressure with good air you will see as much as a tenth. Walt and I have done it in front of people many times. In the thick air I back it down to stock. If the cpu "backs it down" as you say then why is it week after week when I am at 50psi my tips are BLACK and I have to wipe them constantly.

Mr. Wilson, right here bud.
 
ONEBADMK8 said:
It does not "back down" from the cpu. I have used ours sucessfully for years and the higher the pressure with good air you will see as much as a tenth. Walt and I have done it in front of people many times. In the thick air I back it down to stock. If the cpu "backs it down" as you say then why is it week after week when I am at 50psi my tips are BLACK and I have to wipe them constantly.

Mr. Wilson, right here bud.
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yea, i was looking at that, but if i can get the aeromotive one for $30 less i think i would get that, although id rather one i can get to be made green.
 
Don't Lincolns have return-style fuel systems without a factory fuel pressure sensor? If that's the case, then I agree with Geno, there is no way the ECU can make changes to fuel pressure. A fuel pressure regulator is a mechanical device, not electrical - and thusly, the ECU would not be able to change it. I also don't think that the fuel pumps in Mark VIIIs have variable voltage running to them.

Paul.
 
Dr. Paul said:
A fuel pressure regulator is a mechanical device, not electrical - and thusly, the ECU would not be able to change it.

Paul.
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Thats what I was having a hard time understanding. Why when I adjust mine, drive it for a period of time, like a year, it is exactly what I adjusted it to. Always is.

Also why spend $ to boost, more $$ to support high boost, and not spend the extra $100 to supply it.
 
02LSE96LSC91SE84TC said:
Also why spend $ to boost, more $$ to support high boost, and not spend the extra $100 to supply it.
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I'm not sure I understand what you're asking. The fuel pressure regulator has little to do with fuel supply. It is fuel pump volume, injector size, and pulsewidth that control fuel supply.

My 422 makes twice the power of a stock 302, and I still use stock fuel pressure. It works fine. Additional fuel pressure usually becomes an issue under boost pressure, but not nearly so in naturally aspirated motors.

IMHO.

Paul.
 
Dr. Paul said:
I'm not sure I understand what you're asking. The fuel pressure regulator has little to do with fuel supply. It is fuel pump volume, injector size, and pulsewidth that control fuel supply.

My 422 makes twice the power of a stock 302, and I still use stock fuel pressure. It works fine. Additional fuel pressure usually becomes an issue under boost pressure, but not nearly so in naturally aspirated motors.

IMHO.

Paul.
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I don't mean you need more pressure to supply a powerfull motor. Non the less the fuel does pass throu the regulator and it is a piece of the fuel system. I just don't understand why you would have such a nice pc of machinery and and not put a more durable pc in place. I read, and maybe thats the problem, that the stock regulator won't hold up to the stronger pump, if thats wrong then fine. I also read stock regulators are often off by a bit, so you may not be getting the 39psi. Just saying you don't replace a cap without a rotor. I put my regulator in with the new injectors, made sense to me.
 
Dr. Paul said:
Don't Lincolns have return-style fuel systems without a factory fuel pressure sensor? If that's the case, then I agree with Geno, there is no way the ECU can make changes to fuel pressure. A fuel pressure regulator is a mechanical device, not electrical - and thusly, the ECU would not be able to change it. I also don't think that the fuel pumps in Mark VIIIs have variable voltage running to them.

Paul.
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Agreed They are not returnless. Return style with mechanical/vacuum FP regulators. You don't want to put a 98.5 and up cobra pump in there - the returnless type-. The pump will fry itself out in less than 500 miles. Ask me how I know.
 
Dr. Paul said:
Don't Lincolns have return-style fuel systems without a factory fuel pressure sensor? If that's the case, then I agree with Geno, there is no way the ECU can make changes to fuel pressure. A fuel pressure regulator is a mechanical device, not electrical - and thusly, the ECU would not be able to change it. I also don't think that the fuel pumps in Mark VIIIs have variable voltage running to them.

Paul.
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The 97/98 Mark VIII fuel pumps are variable voltage. However that doesn't explain why the fuel pressure would drop back to stock after a few days on my 95 LSC since gen 1's aren't variable voltage.
 
98LSC32V said:
The 97/98 Mark VIII fuel pumps are variable voltage. However that doesn't explain why the fuel pressure would drop back to stock after a few days on my 95 LSC since gen 1's aren't variable voltage.
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Do 95 LSC's have a fuel pressure sensor that the ECU keeps tabs on? If not, it is impossible for it to return to stock... at least at the hands of the computer.

If, for example, the car were running rich due to higher fuel pressure (although that would likely be nominal) - the ECU would respond by adjusting injector pulsewidth, not fuel pressure. Does that make sense?

Paul.
 
Dr. Paul said:
Do 95 LSC's have a fuel pressure sensor that the ECU keeps tabs on? If not, it is impossible for it to return to stock... at least at the hands of the computer.

If, for example, the car were running rich due to higher fuel pressure (although that would likely be nominal) - the ECU would respond by adjusting injector pulsewidth, not fuel pressure. Does that make sense?

Paul.
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Can't see where it could be. It would have to be between the regulator and injecters, right?, and I recall nothing being there to that effect.
 
98LSC32V said:
The 97/98 Mark VIII fuel pumps are variable voltage.
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I think you are mistaken.

Could you please point me to some manual/text/whatever that specifies this? Variable votage fuel pumps are found on returnless fuel systems, AFAIK. And since returnless fuel systems don't need a return line, (which the 98 marks have), they also wouldn't need a Fuel Pressure Regulator, since the FP would be regulated by varying fuel pump voltage.
 
02LSE96LSC91SE84TC said:
Can't see where it could be. It would have to be between the regulator and injecters, right?, and I recall nothing being there to that effect.
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A fuel pressure regulator is simply a restriction on the amount of fuel that is permitted to pass through the return line, nothing more. I think perhaps you are mistaken about the fuel pressure returning to stock on your setup.
 
Dr. Paul said:
A fuel pressure regulator is simply a restriction on the amount of fuel that is permitted to pass through the return line, nothing more. I think perhaps you are mistaken about the fuel pressure returning to stock on your setup.
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I didn't say that, I said mine always stayed where I left it.

Wrong person.
 
2nd gen cars actually do adjust voltage to the pump - there are settings or idle, low rpm, and WOT. I don't see how you burned up a newer style pump - it either run dry in unmodified basket or was faulty from the start. There are few marks running around with focus and aviator pumps already with no issues.

Even 1st gen cars can cut voltage to the pump thus reducing pressure output.

" The 97-98 are PWM - which means the pump sees a signal consisting of square waves that have a variable duty cycle (so its either 13V or 0VDC - the ghetto pic below would be about a 25% duty cycle (meaning the waveform is "ON" or "High" 25% of the time"
 
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