Jump to content
SAU Community

What is this whisting noise? Fuel related

Predator1

By Predator1,
in Engines & Forced Induction

 Share

Recommended Posts

Predator1 Rising Star

Predator1

Posted
Posted

Hi,

Can someone please help me identify this noise. It happens perhaps 1 out of 4 drives. When this happens, the fuel pressure, and temperature are well within parameters, FP is 37psi, and temps are around 35-40C. When it happens, it happens at idle, or when I'm cruising around. The ECU has several fuel related cuts, eg, high temp, low pressure. I've had the tuner check the tune when this noise happens, and everything checks out.

My fuel setup is below:

Frenchy's Performance twin in-tank setup(Not the TE edition, but v1)
Twin Walbro 285 pumps(with check valves - 470lph)
Both Pumps are PWM controlled - @ Idle they BOTH run at low speed, and then at eg 2500rpm they BOTH ramp up to full speed.
-10 feed
-8 return going into a Y with 2 -6's - 1 for the ethanol sensor, and the other to bypass(reduce restriction)
Aeroflow 10micron filter
FTurboSmart P2000


The car drives fine and boosts fine - Just sometimes this random noise appears out of the blues. Last time it happened, I was on 1/4 tank, so I filled it up to 1/2 - Noise still there. I can see the FP consistently change with boost as I drive it as well.

I thought that the ethanol sensor was faulty, so here's what I did:

* While car was idling, unplugged the eth sensor - Noise still there
* Restarted car - Noise went away for about 30 secs, then it gradually picked up volume(louder) - This is what can be heard in the video.

Can anyone please shed some light on this or if anyone's experienced this type of whistling noise?

Excuse the exhaust noise and video - I had the phone by the rear diff where my filter etc is mounted trying to pinpoint the noise.

 

GTSBoy Grand Master

GTSBoy

Posted
Posted
On 2/12/2022 at 9:40 AM, Predator1 said:

While car was idling, unplugged the eth sensor - Noise still there

Well....unplugging the sensor isn't going to do anything. It's not like it's an active component. It's just a pipe.

Have you considered unplugging one pump at a time? If you kill a pump while the noise is there and the noise dies immediately, you've probably found your villain.

Beyond that, it is just diagnostics 101. Open the return pipework and have the fuel not go back to the tank. Drop it into an external bucket. See if it's singing as it goes through a piece of thread tape stretched across a fitting, or something equally stupid. It's always something stupid.

Predator1 Rising Star

Predator1

Posted
  • Author
Posted

Yes, sadly I didn't think of it when the noise occurred last time(stupid me, as I was pacing). I've taken the whole fuel intank setup today and everything checks out. Nothing was loose at all. I'll change the socks as they look a little discolored - I hosed it off with 1/2 can of brake cleaner and couldn't see any crap out of it(Onto a while A4 paper).

What does that sound like though?

IMG_0592.JPEG

IMG_0588.JPEG

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Slight brake pedal stutter after new pads

      By MBS206 · Posted

      Jack the back of the car up, pull that wheel off, pull that sensor out, and put a bore scope into the hole to inspect the outer casing, see if anything looks damaged before you pull the whole thing apart.
    • PranK
      Slight brake pedal stutter after new pads

      By PranK · Posted

      Ergh... So I pulled the speed sensor out again and the tip was shiny so I think it's rubbing the bearing. The bearing contains the magnets for the speed sensor so I think when the first sensor broke it damaged the magnet ring on the bearing.  This is just a Google image, but there is a hole going to the bearing. So when the tip broke off the old sensor I'm guessing it fouled the bearing... As the magnet is only protected by a plastic cover it would be easy to damage it. So I guess I'm doing a bearing again.   
    • GTSBoy
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By GTSBoy · Posted

      My thinking is that if the O2 sensor is shot then your entire above described experience is pure placebo.
    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      Here is the mess that I made. That filler there was successful in filling dents in that area. But in the middle area. I can feel dents. And I've gone ocer it multiple times with filler. And the filler is no longer there because i accidently sanded it away. I've chased my tail on this job but this is something else lol. So I'm gonna attempt filler one more time and if it doesn't work I'll just high fill primer the door and see where the issues are because guidecoat is of no use atm.
    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      Ok, so I think I sort of figured out where I went wrong. So I definitely overthinked it, and I over sanded, which is probably a large part of the problem. to fix it, I ended up tapping some spots that were likely to be high, made them low, filled them in, and I tackled small sections at a time, and it feels a lot better.    I think what confused me as well is you have the bare metal, and some spots darker and some are lighter, and when I run my finger across it, it' would feel like it's a low spot, but I think it's just a transition in different texture from metal to body filler.    When your finger's sliding on the body filler, and crosses over to the bare metal, going back and forth, it feels like it's a low spot. So I kept putting filler there and sanding, but I think it was just a transition in texture, nothing to do with the low or high spot. But the panel's feels a lot better, and I'm just going to end up priming it, and then I'll block it after with guide coat.   Ended up wasting just about all of my filler on this damn door lol  
×
×
  • Create New...