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Old 10-29-2015, 03:27 PM   #1
diablorojo
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M54 Fuel Pressure / Aftermarket Regulator Routing

Looking to stabilize my fuel pressure and figured it would be a great discussion as we are hitting higher HP numbers in our non M projects.

What happens when the hose is disconnected to the FPR on the fuel filter?

Is it possible to disconnect the vacuum house and place an aftermarket FPR inline to the fuel rail? (no vacuum to the stock FPR on the fuel filter)
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Old 10-29-2015, 04:01 PM   #2
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Quote:
Originally Posted by diablorojo View Post
Looking to stabilize my fuel pressure and figured it would be a great discussion as we are hitting higher HP numbers in our non M projects.

What happens when the hose is disconnected to the FPR on the fuel filter?

Is it possible to disconnect the vacuum house and place an aftermarket FPR inline to the fuel rail? (no vacuum to the stock FPR on the fuel filter)
Removing the hose from the FPR will increase fuel pressure.

Install a M52/M52TU fuel filter without the FPR and use your aftermarket FPR.
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Old 10-29-2015, 04:05 PM   #3
diablorojo
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Originally Posted by cosmos328Ci View Post
Removing the hose from the FPR will increase fuel pressure.

Install a M52/M52TU fuel filter without the FPR and use your aftermarket FPR.
So if removing it increases fuel pressure, whats the reason to change to the other fuel filter if the adjustable FPR is going to regulate the flow anyway?

What is the advantage in switching them out?
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Old 10-29-2015, 05:03 PM   #4
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So if removing it increases fuel pressure, whats the reason to change to the other fuel filter if the adjustable FPR is going to regulate the flow anyway?

What is the advantage in switching them out?
If you remove the hose from the OEM FPR incorporated on your fuel filter you will have a higher fuel pressure, you will not be able to adjust the fuel pressure below this static higher fuel pressure with your adjustable FPR.

The advantage of switching the fuel filter to the M52/M52TU is you will have full fuel pressure control with your adjustable FPR.
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Old 10-30-2015, 01:54 AM   #5
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Fpr on stock m54 filter returns the fuel to the tank, hence why you will have no control. That's with MS43 cars anyway, not sure on the setup of ms45 cars.
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Old 10-30-2015, 06:16 AM   #6
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Gotcha!!! But do I really want or need to go below the static pressure? I thought the purpose was to increase pressure for reliability. With everything else upgraded the pressure and fuel flow also requires upgrading.
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Old 10-30-2015, 06:51 AM   #7
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MS45 cars are atmosphere referenced. I had a longer return line added (from the rail) and run an aeromotive fpr. This setup works for both the Motec and the DME, and if I want to, I can add vacuum reference at any time (if I run out of pressure due to too much boost...) As has been said, you need a different filter..Using the E36 filter at the moment.
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Old 10-30-2015, 01:17 PM   #8
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Thanks. I hunt one down.
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Old 10-30-2015, 02:33 PM   #9
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Thanks. I hunt one down.
You'll need a non oem filter for e85
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Old 10-31-2015, 08:27 AM   #10
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It's my understanding that the "vaccum" line on the FPR needs to be connected to the ESS manifold, because on a boosted car you need to offset the pressure against the fuel injectors. In a stock NA car you have engine vacuum that helps suck the fuel out of the injectors, but when you get to boost there is positive pressure pushing against the fuel coming out of the injectors. Looking at how a FPR works, adding positive boost pressure to the "vacuum" line will INCREASE fuel pressure to offset the positive boost pressure in the manifold.

If you keep literal vacuum on the FPR while adding boost, you are lowering your fuel pressure AND the pressure in the manifold will further hinder fuel flow, a double whammy.

At least in ESS case, they tune their fuel control assuming that you have a positive boost pressure coming down that FPR "vacuum" line during boost.
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Old 03-30-2017, 04:27 AM   #11
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May I bump the old thread..
Im running a turbo m54 and having lean AFR on high RPMs (going towards 15-16AFR).
Stock FPR is connected to the same line as brake booster, after the check valve.

By the info on the last post I should connect the vacuum hose to the manifold so it would have positive pressure?
Anyone running FPR from a m3?
Or aftermarket FPR?
Which should I go for?
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Old 03-30-2017, 01:25 PM   #12
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Stock FPR is connected to the same line as brake booster, after the check valve.
Pretty sure the check valve prevents the booster from seeing boost. If that's the case, then your FPR is also not seeing boost. You need a signal source that sees boost for the FPR to behave in the manner that you want - fuel pressure increases when engine is on boost.
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Old 03-30-2017, 01:28 PM   #13
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Yup, after check valve there's no boost.
Okay, let's try that tomorrow!
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Old 05-04-2017, 04:53 AM   #14
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Hi!

I will be running a Walbro GST450, i heard that many have had problems with the increased flow on stock fuelfilter/fpr combo on M54.

I just bought an M52TU fuelrail with "built in" FPR which should handle way more flow. Very cheap upgrade along with an stock M50/M52/M52TU filter
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Old 05-04-2017, 10:00 AM   #15
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M54 Fuel Pressure / Aftermarket Regulator Routing

Just remove stock filter/regulator. Install upgraded can style filter in its place. Bolt adjustable fpr to trans tunnel. Route soft lines back into the stock lines. Route map line back to the manifold or pressure block. No check valves or anything, you want to reference manifold pressure and set the static pressure with the car running and the map line removed. Done, works great, no issues even with a huge fuel pump.


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Last edited by Pole position; 05-04-2017 at 10:01 AM.
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Old 05-04-2017, 06:16 PM   #16
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What FPR are you guys using?
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Old 05-05-2017, 12:45 PM   #17
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I use a fuelab mini regulator


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