[DML] Re: Fuel Pump Noise

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

You have to be very careful when installing the pump not to twist the
hose. Even if you manage to get it all back the hose can collapse even
if it is not kinked. When it gets that hot it softens up. The fuel
pump passes a large amount of gas. If the hose softens up enough it
will collapse under the vacuum. I use a spring inside mine. I also
notice that some pumps are just noisier than others. I suspect that
they worked harder all their lives and are worn inside so they are
noisy. I agree that the filter on the end is pretty fine so you have
to make sure it is cleaned well. Any restriction will help to cause
cavitation which will cause the pump to be noisy. You have to be sure
all of the fuel pick-up parts are properly positioned and the 2 fuel
hoses coming out of the boot are not kinked or forced against the
tank. In extreme heat you may just have to live with the noise. Don't
forget the cooling system pipes run right alongside the tank and can
also be part of the problem in heating it up. You can also check out
the vapor system. The tank should have a slight positive pressure. If
it doesn't you may have a problem in the cannister or gas cap. A
positive pressure would prevent the bottom of the tank (or the top)
from vibrating. It may turn out to just be a noisy pump and you may
have to replace it. I guess it wouldn't hurt to have a spare (save the
old one, it works, it's just noisy). On th eplus side you know you
have to get fuel when it starts getting noisy! Cuts down the driving
range though. To cool the fuel down you could add cooling fins on the
fuel filter maybe. The fuel pump passes a LOT of gas. And maybe a
blast tube on the filter.
David Teitelbaum
vin 10757 



--- In dmcnews@xxxxxxxxxxxxxxx, "Joseph Kuchan" <josephkuchan@xxxx> wrote:
> 
> Sounds like a good theory. If part of the issue is that the the top
part of 
> the tank from which the fuel pump dangles essentially becomes a
sounding 
> board that amplifies the noise of the pump when the damping effect
of the 
> gasoline is removed, then you could stiffen the top of the tank by
bonding 
> sound deadening material or stiffening ribs to it. Perhaps sticking
some 
> s








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