I will add this, the only time my fuel pump has gotten noisy is when the filter is getting clogged and needs changing.  Jeff 

----- Original Message -----

> Assuming your tank has the smaller (7mm ?) outlet.....

> I doubt that having 2 filters is straining (strained) the pump.
> Although the tank
> shown likely has the larger outlet, P. 20.26 in Bentley shows both filters.

> In spite of having installed all new parts at the time, the fuel pump on my
> '81
> has always been noisy. It gets noisier on hot days, and/or at higher
> altitudes.
> This may be due, in part, to a different issue (EVAP) than what you're
> dealing with.

> I've run that bus with only pre, then only post pump filter and IIRC,
> with both. No real difference in pump noise level. The main issue IMO,
> is the smaller sized tank outlet.
> This aspect has been discussed many times here.

> Neil.

> On 3/18/15, Steven Shelton <shelton4@gmail.com> wrote:
> > A little over four years ago I did the fuel filter “upgrade” on my 1.9L
> > Westfalia.

> > Last week while returning from a trip the pump really got loud. It even
> > seemed like it was harder to get up hills. I'm replacing the pump but I
> > wonder: by having two filters did I put too much strain on the pump and
> > caused premature failure or is there something else I need to look at the
> > prevent premature failure of the fuel pump?
> >

> --
> Neil n

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