Have you looked into this modification?
http://www.benplace.com/vanagon_intermittent_syndrome.htm

When fuel mileage drops, or you have an intermittent problem, this cheap fix
may do the trick.  It worked wonders for me on my 2.1L!

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Pat Spragge
Sent: Wednesday, December 7, 2016 1:24 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: intermittent running rich issue

I'm curious whether anyone else on this list has had this issue or if John
and I are the only ones. I've brought this up in the past but the issue
didn't seem to warrant any interest from the list members

Sent from my iPhone

> On Dec 7, 2016, at 10:07 AM, John Goubeaux <john@UCSB.EDU> wrote:
>
> Thanks, Since I've recently replaced the fuel tank, all the hoses and
> grommets and lines and FP I'm gonna assume, unless i have bad fuel,
> that the fuel supply is not the issue.
>
> I'm wondering though if the fuel pressure regulator can be
> intermittent ? OR if it just goes all at once ? My understanding is
> that when it goes the engine will run very rich as a result of the
increase in pressure.
>
>
>> On 12/7/16 9:41 AM, Don Hanson wrote:
>>
>> Water in the gas tank?   Just did that... the expansion tank rubber
>> grommets on my 84 were useless, and those expansion tanks are
>> perfectly positioned in the wheel wells to collect water on their
>> flat tops, with tubes to take that collected water back into the main
tank.
>>    I surmised that as long as you're moving and the engine is
>> running, the water in the gas is all mixed up and doesn't hurt the
>> running but when you shut down for a while, the water that was in
>> solution with the gas settles out, then when you start again, you get
>> mostly water to run the motor..
>>  I don't know if mine "seemed" to "show" rich symptoms, but bad gas
>> and rich are similar in manifested symptoms...
>>
>>
>> On Dec 7, 2016 8:51 AM, "John Goubeaux" <john@ucsb.edu
>> <mailto:john@ucsb.edu>> wrote:
>>
>>    In my case I've already replaced both the AFM and TB with rebuilt ones
>>    and had them adjusted, so I'm gonna rule them out BUT know they
>>    can add
>>    to bad running issues.
>>
>>    -john
>>
>>
>>    On 12/7/16 8:46 AM, Dan N wrote:
>>
>>        also...it could be a worn throttle body or a faulty throttle
>>        body switch
>>

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