Fuel line knock/hammer/noise

[Chuckd84]

Ive finished the stainless braid ptfe line install for my fitech supply and returns.
Now ive got a horrible knock noise and chatter going on. It sounds like a loose overhead in a diesel engine and a spun rod bearing (if thats any help).
I swear i can hear the injectors hitting there seats at idle making the low level chattering. It changes and speeds up with rpm until about 2k rpm and the engine/exhaust covers it up. The knock matches the hammer i feel in the fuel lines near the throttle body. I ran the lines over the fire wall and over the hvac box so i think thats why its sooo loud in the cab with the door shut. Ive got stable fuel pressure so im stumped on this one. Any ideas?

 

[nvrenuf]

Loose line(s) hitting something?

 

[Chuckd84]

Loose line(s) hitting something?

I wish. I checked it all front to back. Its like its amplified through the dash. I plan to take all of the clamps off tomorrow and keep them off the cab and see if that helps. I cant find online where anyone has had this issue before

 

[Termite_Delight]

Sounds like you might have air in the lines, air gets trapped at the high spots. You said you ran the line over the hvac?

 

[Chuckd84]

Sounds like you might have air in the lines, air gets trapped at the high spots. You said you ran the line over the hvac?

Sorry for the delayed response. Yes, they are on the firewall and run with the cab harness over the hvac box and travel past the blower and into the inner fender to the chassis to avoid heat

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