On 3/15/10, miguel pacheco <mundopacheco@gmail.com> wrote:
> Insulating the pump brings up a couple of thoughts. The first is the
> obvious heat issue. These pumps are cooled by the fuel they move and
> must be, to some extent, by air blowing across the exterior surface.
> If you've insulated the pump, will the fuel cool it sufficiently?
> Won't this cause it to run hot and result in failure? The second
> thought is that if you can hear the pump, there's something wrong.
> Usually, this means that it is fuel starved or it's getting ready to
> fail. In short, it may be useful to be able to hear the pump, should
> it ever start making noise.
> If the pump is properly installed and it is making noise, it's
> probably fuel starved. At 20+ years old,  you can look to the fuel
> tank as the cause.
> Miguel

I was thinking of pump cooling not long ago. During my last trip
through hotter climes, pump was getting louder. In particular noticed
this after refueling, restarted, at idle. Pump noisier than normal.
Likely due to heat affecting fuel in tank, (contributing to pump
cavitation?) but I wondered if pump itself was being affected by
ambient temps. Pump is almost new but fuel tank has the smaller ID
outlet. This doesn't help.

In terms of cooling, I wondered if having the belly pan off would help.

As per Davids comment, he beat me to the punch. (my browser quite
before I could post!)

Could one use a Bosal DV type exhaust hanger (isolater)?

Cheap.

Neil.

--
Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines