[DML] Louder Fuel Pump Buzzing after Replacing Fuel Hoses at the Fuel Pump-- Sound Deadening Help

[Wayne Wagner <dmc-2447@xxxxxxxxxxxxx>]

Hello Group!

I just replaced my fuel hoses at the pump this past Monday with the 
orange hoses with the teflon liner. 

Overall, I'm happy with the teflon hose product, except... after 
finishing the job, I noticed that my buzzy fuel pump was sounding like a 
giant mosquito when the sound of the engine is not covering it up.  It 
was buzzy before, but now it is definately louder... on the verge of 
being annoying.  Given that the difficulty in bending the hoses made 
things tight in the space, the hoses are definately touching the access 
panel and maybe the bulkhead in that space.  So, I think the buzzy sound 
from the pump is getting transfered more efficiently to the bulkhead via 
the stiffer hoses. 

I think a little sound dampening is in order (padding the areas of the 
access panels/bulkhead that the new hoses are touching).  Anybody have 
experience in dampening/isolating fuel pump noise?  What's the opionion 
on urethane foam?  I think I can harvest appropriate chunks of it from 
test equipment packaging.  Or is this material too dense and will not 
dampen much sound?  Any other dampening options?

On the upside, I feel that I am getting improvement in acceleration 
performance since the fuel hose job.  Before, I used to get some degree 
of power hesitation under heavy accelleration.  Since my type of daily 
driving didn't require me to drive like a maniac, I've learned to work 
around that.  I cannot fully explaine the improvements just yet.  For 
now I am speculating that there was partial blockage in the old hoses, 
or some other narrowing of the hose cross section... I haven't autopsied 
the hoses yet to see, but  I know that one of the return line fittings 
had gunk in it like cholesterol buildup in an artery.  All fittings are 
now new except for the supply side.

Regards,
Wayne / VIN#2447
www.AA9DY.com





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