PeachParts Mercedes-Benz Forum - View Single Post

stcbenz83 · #2 06-13-2012, 10:10 AM

No, 99.999% sure that's not possible.. though id actually have to hear and see it for myself..... After accelerating over idle speed , mine only "RoOR".. What your describing sounds exactly like what it is, air getting into the lines with increased fuel flow.

When's the last time you replaced the injector return hose(s)? I'd start there (cheap and easy)... don't pry on the injector nipples when trying to get the old stuff off.. If you scratch/ deform those nipples in anyway, you can almost guarantee you'll have a fuel leak / trashed injector.

sounds dumb but, you replaced both fuel filters, yea?

Second, I would check to make sure that your manual primmer pump is screwed down into the lock position (assuming you have the older style primer pimp). Also, try seeing if you can 'prime' the system using the manual pump.. If fuel starts spraying all over then getting a new one (around $20-$30) is in order.

Make sure your cigar hose isn;t leaking or there isnt any obvious fuel leaks.

my last guess would be that your Injectors are worn out (when where they last replaced?) , spraying poorly and thus, causing the knocking noise your hearing.

Anyway, sure others will chime in but, if its loud enough for you to notice it then perhaps something 'just ain't right'

Goood Luck!