[DML] Re: Fuel Pump "Buzz"

["Harold McElraft" <hmcelraft@xxxxxxx>]

Over the years this has been a constant sore spot for many. I believe 
there are several different causes that make the buzz - some working 
together.

My greatest success in reducing the buzz has been to rearrange and add 
some separation to the coolant pipes that go under, and by, the fuel 
tank. I think this is the greatest source of heat. The goal was to be 
sure the pipes do not touch the tank, especially when the tank 
pressurizes. I added some pieces of coolant hose around the pipes to 
give some separation as the old insulation was rotted and collapsed. It 
seems to work. The noise returned shortly after I messed with it so, I 
examined it again, and found the hose I used had moved and allowed the 
pipe to again touch the tank. I put the hose back in place and secured 
it with a plastic tie - the buzz hasn't returned and, I haven't had any 
problems or noise in many years. The pump is probably 20 years old.

Harold McElraft - 3354

--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote:
>
> Craig,
> As I said, Bosch and I have never come up with what exactly makes 
pumps do
> it. I do know that temperature does because we can make it happen, 
I'm sure
> age has something to do with it but no one has ever had a definitive 
answer,
> yet some pumps can go for years and never do it. Cold, never heard 
any one
> complain about that, so try to come up with something different.  
> Just something to think about. Try to look for variance that may 
cause it.
> John
> 




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