[lantyem]

Recently showed 2AAF - Fuel pump plausibility (have also had these for a while: 2de4, 9319, 5de1). Around the same time I noticed louder ticking from the engine bay, I thought the hpfp might be struggling. I took some logs using TestO of hpfp, lpfp, and rpm on a time basis and plotted them hoping someone here can tell me what the issue is. Each plot is labeled on the title, x is time y is noted in the legend.
In the logs I also see this weird ramping behavior after the car has warmed up..

Can someone tell me if they can tell something from these plots, or if I should be logging something else?

[pysical]

Looks like the LPFP is dipping more than it should. What fuel and mods do you have? Normally the LPFP should be in the 72 range and none of these logs show that.

[lantyem]

Car is nearly stock, just aftermarket dp and dci. Fuel is 93 pump.
Is the ramping behavior normal?

[stewbets]

I agree that the LPFP is definitely a good bit below spec. I don't know exactly what is causing the ramping effect on your HPFP, but I've heard a struggling LPFP can bring a HPFP down.

[lantyem]

Thanks, i'll look into replacing the lpfp next.

[techwhiz]

Originally Posted by lantyem

Thanks, i'll look into replacing the lpfp next.

Get the collar tool.
Makes easy work go the LPFP. Get the regulator too while you are there since it's only $140 and you have to pull it anyway.

But at idle you should be seeing 65-72PSI for the LPFP and it shouldn't be dipping to 50.

Bad pump.

[lantyem]

Originally Posted by techwhiz

Get the collar tool.
Makes easy work go the LPFP. Get the regulator too while you are there since it's only $140 and you have to pull it anyway.

But at idle you should be seeing 65-72PSI for the LPFP and it shouldn't be dipping to 50.

Bad pump.

I talked to my brother, and I think the FPR was changed about a year or two ago. I'll go with the pump only now because of this.
While I'm there, does it not make sense to do the extra work of swapping a walbro 450 in the bucket? How involved is it, in its simplest way to do?

Edit: Isn't the fuel pressure regulator on drivers side while the fuel pump is on passenger side?

[ludoN54]

Originally Posted by lantyem

I talked to my brother, and I think the FPR was changed about a year or two ago. I'll go with the pump only now because of this.
While I'm there, does it not make sense to do the extra work of swapping a walbro 450 in the bucket? How involved is it, in its simplest way to do?

Edit: Isn't the fuel pressure regulator on drivers side while the fuel pump is on passenger side?

yes, fuel pressure regulator on driver side

i'm currently experiencing same issue, changed pump, FPR, and still got the code ( and noticed on my logs that my LPFP was very low)

now thinking about the EKPM
https://datazap.me/u/ludovic-poviac/...og=0&data=2-19

[lantyem]

Originally Posted by ludoN54

yes, fuel pressure regulator on driver side

i'm currently experiencing same issue, changed pump, FPR, and still got the code ( and noticed on my logs that my LPFP was very low)

now thinking about the EKPM
https://datazap.me/u/ludovic-poviac/...og=0&data=2-19

Did you ever resolve this?
I changed thee fuel pump today and I'm still getting code 2AAF and 50 psi of pressure

[ludoN54]

Originally Posted by lantyem

Did you ever resolve this?
I changed thee fuel pump today and I'm still getting code 2AAF and 50 psi of pressure

Fuel level sensor fixed my issue

[lantyem]

Originally Posted by ludoN54

Fuel level sensor fixed my issue

On the passenger (pump) side or the driver (regulator) side?

[ludoN54]

Originally Posted by lantyem

On the passenger (pump) side or the driver (regulator) side?

The one on the engine next to the fuel rail

[lantyem]

Originally Posted by ludoN54

The one on the engine next to the fuel rail

oh, the pressure sensor. I changed mine for one from fcp euro, also with no change :\

[ludoN54]

Originally Posted by lantyem

oh, the pressure sensor. I changed mine for one from fcp euro, also with no change :\

BTW, before changing fuel pressure sensor,i changed everything related to low fuel pressure system

everything on the left side, everything on the right side + EKPM

[mweisdorfer]

Originally Posted by lantyem

I talked to my brother, and I think the FPR was changed about a year or two ago. I'll go with the pump only now because of this.
While I'm there, does it not make sense to do the extra work of swapping a walbro 450 in the bucket? How involved is it, in its simplest way to do?

Edit: Isn't the fuel pressure regulator on drivers side while the fuel pump is on passenger side?

You can do the stage 2 Walboro 450 for probably less than an OE LPFP.

Boost concepts has a DIY, on YouTube. & there are a couple DIYs on this forum.

Vehicular DIY also made a YouTube video.

I think Boost Concepts must make a special pump bracket for the Walboro 450. So, you will have to re-use the stock bracket.

From what I can tell, you need to make a T from the pump. Probably a an SS T would work best. I think #4 SS worm clamps would be more user friendly. Take the gates fuel line and clamp it down with a worm clamp to the pump & then put the SS T to it... secured with a worm clamp. Use the corrugated fuel line to secure the venturi, and run it the one side of the T. The fuel line with the quick connect, in the fuel tank, will secure on the other side of the T. You just need to make sure that any items you use to make the connections can be submerged in gas & is E85 tolerant. I'd use a corrugated 8 to 9mm line. Stainless steel is a metal that isn't effected by gas or E85. Aluminum is no, no....
You can get a sock on Amazon for the 450 that is pretty close to the one used in Boost Concepts videos. Therefore, you don't have to cut out the bottom part of the bucket like Vehicular DIY did.

https://www.summitracing.com/parts/v...SABEgLwmvD_BwE

Koehler Enterprises KE4BX 10 Piece Hose Clamp Box (Micro Size 4) https://www.amazon.com/dp/B00XAK6RU4..._JJ6KEbKZEPXM0

Gates 27093 Fuel Line Hose https://www.amazon.com/dp/B001R5XSGU..._vK6KEbBWCTSVM

Beduan Stainless Steel 5/16" Hose Barb, 3 Way Tee T Shape Barbed Co2 Splitter Fitting https://www.amazon.com/dp/B07VQXY7K7..._1K6KEbYPXMZ3V

HFP-FH89-140 [QTY 2] 8mm x 9mm x 140mm Corrugated Fuel Resistant Flexible Hose Line for Fuel Pump Assembly 8x9x140mm - E85 Compatible https://www.amazon.com/dp/B07RSTC2DF..._qL6KEbGTGTHZP

Walbro 1250572 Fuel Filter https://www.amazon.com/dp/B00BT1CNSQ..._WL6KEbD8KDQPW


120PCS Solder Seal Wire Connectors - Sopoby Heat Shrink Solder Connectors - Waterproof Solder Butt Connector Kit Insulated Automotive Marine Electrical Wire Terminals https://www.amazon.com/dp/B07S62KYSL..._h06KEb5ARYGR2

[m/335]

Does anyone know what the parameter is called for logging lpfp and hpfp in testo?