adjustable fuel pressure regulator

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robertf

Well-known member
Jan 22, 2006
4,792
361
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Yes, I've used one, but it was an application that actually needed adjusted pressure. Why would you need to change the pressure on a rover v8?

The one I used looks the same as that one. Had 2 springs for low pressure or high pressure. I needed 15psig atmospheric reference and it did a shitty job of maintaining that
 
4Runner

4Runner

Well-known member
May 24, 2007
663
111
Boise Idaho
Why are you changing it? You won't get any horsepower increase if yours is working right. Hi flow doesn't matter unless you are running some high boost turbo or supercharger set up with a larger fueling system. If you need more fuel, increase your injector size by a little or the type of injector. All things being good, you probably aren't hurting for fuel unless you've done a bunch of mods. The other issue is that the stock regulator is a rising rate style and not a fixed pressure. As your engine vacuum drops the fuel pressure goes up. The one in the ad looks like an adjustable fixed pressure unit. Your motor will probably run worse at lower rpm with that unit. Any how, just a couple of thoughts
 
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AbnMike

Well-known member
Apr 6, 2016
1,218
117
Western Slope, CO
I didn't say I was changing it. I was asking if anyone used one.

I'm guessing my 8mpg has to be the pressure regulator - everything else is changed and/or new and/or showing no symptoms.

So does anyone know if the AEL and non-AEL fuel pressure regulators are the same? They look the same but there's a couple hundred bucks in price difference.
 
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robertf

Well-known member
Jan 22, 2006
4,792
361
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The fittings are different on the fuel rail for the fue ones. They are actual o ring lines and not a hose clamp and ferrule.
 
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mburnett

Well-known member
Jul 26, 2008
54
0
Archbold, Ohio
Something I found chasing a worse than usual fuel mileage problem was one side had a short term fuel trim of 25. Turned out to be a bad front O2 sensor and it wasn't throwing a code for some mysterious reason. My slightly less than crappy mileage came back and the SFT is actually in the low single digits. For $20 I have a WIFI OBDII interface plugged in full time now. Every car should have one as standard equipment anymore. Of course, YMMV
 
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AbnMike

Well-known member
Apr 6, 2016
1,218
117
Western Slope, CO
mburnett said:
Something I found chasing a worse than usual fuel mileage problem was one side had a short term fuel trim of 25. Turned out to be a bad front O2 sensor and it wasn't throwing a code for some mysterious reason. My slightly less than crappy mileage came back and the SFT is actually in the low single digits. For $20 I have a WIFI OBDII interface plugged in full time now. Every car should have one as standard equipment anymore. Of course, YMMV
Click to expand...

Thanks. I replaced both fronts. At one point I was down to a 0.9 LTFT ( my STFT fluctuates between negative and positive numbers, but mostly negative - which seems to me that perhaps my regulator is throwing extra fuel (or not returning it to the tank) leading the STFT to overcompensate by trying to lean the mix). I've been running a 3.9 LTFT for weeks now.

I still have a fluctuating downstream 02sensor, and I replaced it with my used fronts, and it's still fluctuating, so either I have a bad cat or need a new sensor back there.
 
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