[KamZL1]

Anyone know what is making this noise? is it the fuel line? very clear inside the car:

https://drive.google.com/file/d/1SIK...ew?usp=sharing

https://static.nhtsa.gov/odi/tsbs/20...16662-9999.pdf

This is what I'm thinking may be rotor slapping a little but hopefully just this service bulletin.

[2023_ZL1-AUTO]

So... is your ZL1 stock? Mine has very loud fuel injectors when they are pulsing. So loud in fact, after I got my car back from Katech I called Mike to ask about it.

[nighttowl]

Originally Posted by KamZL1

Anyone know what is making this noise? is it the fuel line? very clear inside the car:

https://drive.google.com/file/d/1SIK...ew?usp=sharing

https://static.nhtsa.gov/odi/tsbs/20...16662-9999.pdf

This is what I'm thinking may be rotor slapping a little but hopefully just this service bulletin.

Mine makes the noise caused by this hose.

[WhiteMale]

there's a rather large thread "ZL1 with a tick"...I think is the title. I wasn't able to listen to your video though.

[KamZL1]

Originally Posted by 2023_ZL1-AUTO

So... is your ZL1 stock? Mine has very loud fuel injectors when they are pulsing. So loud in fact, after I got my car back from Katech I called Mike to ask about it.

just e tune and headers, no di upgrades

[gblaue]

https://static.nhtsa.gov/odi/tsbs/20...50256-0001.pdf

[Adriangibson]

YouTube would be of help

[radz28]

IMHO - it's hard to tell what you're talking about in the video. IF - it's the hose you're talking about, I have noticed a few things with my situation.

I've started getting longer cold starts than I had a few years ago this time of year. It was extended cranking time, and sometimes multiple cranks. Once he finally chugged to life, I could hear what sounds like a tapping sound, but it doesn't correspond with engine speed (I'll have to check again, but I feel like it's probably around 160-beats/minute). It's almost a very heavy pulse-type-sound. After about a minute or so of idling, it goes away. AND - if I do a restart, he immediately fires right back up, with no extra crank time, or chugging to life or anything or tapping sound. He's just on and idling fine. I also notice that the shorter intervals between drives the less intense the tapping, and the shorter it taps.

I have a feeling this has to do with running E'. I'm at almost E80 (pump) and this started happening a year ago, or so, after adding PI and running E'. I FEEL like I could hear something similar, when I was only on gasoline, but it wasn't nearly as pronounced. I haven't run gasoline to verify, but that's what I'm guessing.

I might replace the line with the new one anyways since it doesn't look like it must be too big a deal. I think book time was only a few hours, so it can't be that bad I guess. I'm not seeing anything funny with fuel pressure, so if it's just a NVH deal, I can wait for a bit. I might just order the line anyways, and do it later, but so far - no biggie. I've also been running ethanol treatment, blended at the prescribed amount. I don't know if that helps, but I DO know that a DeatschWerks helpline technician suggested running
Power Plus Lubricants 19769-18 - Power Plus Top Lube for fuel pump longevity. I was going to pick a bottle of that up to see if that helps, but at least I'll have some confidence in it helping with their pumps.

[KamZL1]

Thanks for replies, pretty sure the line is the culprit. I guess if it aggravates me enough ill change it one day but as long as it's mechanically sound, not too worried.

[triggerjerk]

What is your build date? If it was May/June 2023 it likely has a defective fuel feed pipe and needs replacement per the tsb in post 6 above. I would get it done if you still have a warranty.