Bosch 044 noise Survey...
#61
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Originally Posted by Tom M'Guinn
Well, the noise is in the fuel system, originating at the rail (damper/injectors/FPR?) and traveling down the hard fuel lines under the body. Nothings for sure until I eliminate the noise though...
#62
Nordschleife Master
A customer of mine installed an extra fuel damper from a 911 turbo (vacuum/pressure regulated) between the supply line and fuel rail and the tapping noise completely dissapeared.
I'm pretty convinced the knocking sound is due to the Marren damper not doing its job (except for the noise transmitted from steel lines rubbing against body).
I'm pretty convinced the knocking sound is due to the Marren damper not doing its job (except for the noise transmitted from steel lines rubbing against body).
#63
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Originally Posted by RolexNJ
So it sounds it's really the fuel rail itself that is then coming down the fuel lines? As soon as you research more, yet again, let me us know, thanks. Damn, this thing seems like it is never ending?
#65
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Originally Posted by special tool
I have the same pump and lines as you, and it knocks pretty loudly.
#66
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I have a stock fuel rail and damper, braided lines. I just have a hum coming from the pump. A little louder now than in the summer but unnoticable
once under way.
I cut the rubber jacket off the old pump and wrapped the 044 pump with it
before installing.
once under way.
I cut the rubber jacket off the old pump and wrapped the 044 pump with it
before installing.
#67
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Originally Posted by tconn
I have a stock fuel rail and damper, braided lines. I just have a hum coming from the pump. A little louder now than in the summer but unnoticable
once under way.
I cut the rubber jacket off the old pump and wrapped the 044 pump with it
before installing.
once under way.
I cut the rubber jacket off the old pump and wrapped the 044 pump with it
before installing.
#68
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Thread Starter
Originally Posted by Duke
A customer of mine installed an extra fuel damper from a 911 turbo (vacuum/pressure regulated) between the supply line and fuel rail and the tapping noise completely dissapeared.
I'm pretty convinced the knocking sound is due to the Marren damper not doing its job (except for the noise transmitted from steel lines rubbing against body).
I'm pretty convinced the knocking sound is due to the Marren damper not doing its job (except for the noise transmitted from steel lines rubbing against body).
Thanks. So, did he use two dampers -- one in-line, plus the factory one on the rail?
It looks like the LR fuel rail would allow for a variety of dampers, so I've sent Dave a note asking about that as a possibility.
#70
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Originally Posted by tconn
Tom, I have the Pauerman lines and run 55# siemens injectors.
#71
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Originally Posted by RolexNJ
That all said above guys, it has to be the LR Fuel Rail, no?
tconn and I both have stock fuel rails, both have 044 pump, both have pauerman lines, both have seimen's injectors (mine are bigger though) ...
yet mine knocks and his doesn't...
#72
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Originally Posted by Tom M'Guinn
tconn and I both have stock fuel rails, both have 044 pump, both have pauerman lines, both have seimen's injectors (mine are bigger though). yet mine knocks and his doesn't...
#74
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Originally Posted by tconn
How is the pump mounted? Maybe not enough insulation?
I wrapped it in rubber sheeting. The pump itself just whirs away -- very smooth sounding and not a problem, even with a mechanics stethescope on it -- no knocking from the pump itself. The knocking sound is coming from the hard lines and/or rail/regulator/injectors it seems.
#75
Nordschleife Master
I haven't heard any 044 pump that knocks? A sweet whine can be heared though
Yes Tom, the Marren was in its original place and a stock type damper was added on the supply line. That solved the problem.
Yes Tom, the Marren was in its original place and a stock type damper was added on the supply line. That solved the problem.