Hot start issue m62tub44

[80stech]

Did you replace the pump only or the assembly with fuel sender? What brand ?

[IsStupid]

Yeah it's pretty loud, also doesn't sound like it's coming from the side of the tank that the pump that I changed is on, is there another pump on the other side? I thought it was just a sender thingy on the other side?
I only changed the pump itself, think its a pierburg one?

[andrewwynn]

The pump touches the bottom of the tank and will vibrate the whole tank bottom. Take a video or use a tool like FFT app to figure out what relative loudness and frequency.

The unused gas comes back from the FPR into the siphon jet on the left side. There could be audible artifacts but if so I'd bet it's from the o-ring leaking if that's not been addressed yet. Mine sprayed like a garden hose into the top of the tank would definitely be audible.

[80stech]

The foot on the housing gets pressed to the bottom of the tank not the pump.
If you replaced just the pump alone there is a good chance that you might have done something to mess up the isolation to the sending unit/holder. Did you replace the isolators? and are they in the right way? There could be transfer through the hose as well, maybe contacting the housing close to the pump etc.

[andrewwynn]

Yes the foot of the *pump* housing. Has a very stiff spring for a very direct sound short to the plastic tank.

Sound will travel much faster thru plastic than air and even though less than steel it will confuse your head where the sound is coming from.

Most notable with the likes of suspension sounds.

Example: when you are on the left side of the car, a sound from the right can travel ≈ 3500 mph though the sway bar, and come though the last bit of air before the direct transmission though the air of the source.

The same could be happening with the pump noise. I would investigate though. If the FPR return line is leaking or will make noise at the top of the left sender unit.

I got sprayed right in the camera lens when I tried to examine the expected drip that was a spray like a garden hose.

Sound advice about the vibration shock absorbers.

That said I can almost always hear the pump from outside any car. I can usually hear inside if the engine isn't running

[IsStupid]

No obvious leaks, fuel levels not going down, no puddles or fuel smell

[IsStupid]

Originally Posted by andrewwynn

The pump touches the bottom of the tank and will vibrate the whole tank bottom. Take a video or use a tool like FFT app to figure out what relative loudness and frequency.

The unused gas comes back from the FPR into the siphon jet on the left side. There could be audible artifacts but if so I'd bet it's from the o-ring leaking if that's not been addressed yet. Mine sprayed like a garden hose into the top of the tank would definitely be audible.

Which o ring is this? I've not messed with the other side yet, is there a pump that equalises fuel level across both loves of the tank?

[andrewwynn]

Yep there's a pump driven by the return fuel from the FPR. It has a factory defect and will eventually spray enough fuel into the left tank that it will stop functioning when the total tank volume is less than 1/4 and eventually 3/8 of a tank.

You can find my thread on the fuel supply and I believe it includes the problem and the fix.

There's an additional joint that doesn't even have a seal from the factory.


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[IsStupid]

Originally Posted by andrewwynn

Yep there's a pump driven by the return fuel from the FPR. It has a factory defect and will eventually spray enough fuel into the left tank that it will stop functioning when the total tank volume is less than 1/4 and eventually 3/8 of a tank.

You can find my thread on the fuel supply and I believe it includes the problem and the fix.

There's an additional joint that doesn't even have a seal from the factory.


Sent from my iPhone using Tapatalk Pro

Any chance you could throw a link up so I don't have to trawl through your 10k+ comments to find it?

[andrewwynn]

Better to teach a man to fish.

Do an advanced search;

Username: andrewwynn
Title: awr-fix

I put awr-fix in the title of my repair threads to make it easy for people including myself to find the threads.

It's how I find mine or other threads.

Try to find. If you have problems somebody will help but you'll fare much better in the long run learning that skill for finding topic based discussion.