Water gets in through failed grommets in the tank venting system as well as cracked expansion tanks in the wheel wells.  The grommet on the top of those tanks can also rot.  They get splashed with plenty of water. Less likely is condensation, which can occur if you store the van with less than a full tank over the winter.

Stuart

> On Aug 18, 2017, at 1:15 PM, David <fjazzbass@GMAIL.COM> wrote:
> 
> With regard to a filter completely clogging... rusty / what caused the rust
> in the first place? Was it that moisture was getting into the tank? Water
> in gas?
> I've heard of filters collapsing from becoming saturated with water...
> maybe there's more to this?
> 
> Just thinking it through...
> 
> Dave
> 85 GL baby bus...
> 
>> On Fri, Aug 18, 2017 at 3:11 PM, Dan N <dn92610@gmail.com> wrote:
>> 
>> if you use the pre-pump filter I'd recommend that you get any see-thru fuel
>> filter much larger than the tiny one in there...I got one that's at least
>> half the size of the post-pump filter...
>> 
>> much better flow and last longer too
>>