Clever, but I have a pump sitting on my bench and happen to have an extra battery there as well.  So I think I might be brave enough to rig up a bench test.  I almost hope the pump is loud as My list of fixes on my van is growing out of control even for me! 

But if I need a new tank so be it.

Eric Caron 
85 GL Auto 

> On Sep 4, 2022, at 10:08 PM, Dan N <dn92610@GMAIL.COM> wrote:
> 
> You could do this test for the price of a long hose. (I didn't try it yet)
> 
> - Close the outlet hose from the fuel tank (with a pinch plier). Connect
> the long hose to the inlet of the fuel pump or the fuel filter. Put the
> other end of the long hose as far as you can in the fuel tank filler. Start
> the engine and try to listen for the noise and/or vibration by the feel
> with your hand.
> - No noise? -> then the in tank filter or the inlet is clogged.
> - Noise? -> then something wrong with the fuel pump.
> 
> On Sun, Sep 4, 2022 at 6:09 PM Eric Caron <ericcaron96@comcast.net> wrote:
> 
>> That’s what I’m afraid of.
>> 
>> This bus was with Dennis for 2 years so I was hoping the tank was good as
>> it had Benn up and down in the shop several times.
>> 
>> I’ll get help to bench test the pump but if it is fine I suspect my tank
>> is contaminated.  A shame as it seems in great shape.
>> 
>> Is it a fact that this problem can damage fuel injectors?  Need to know as
>> I’ve already had one fail and plan to replace all 4.  I don’t want to
>> damage the new ones.
>> Any recommendations on best gas tank for a 85?
>> 
>> Eric Caron
>> 85 GL Auto
>> 
>> 
>> 
>>> On Sep 4, 2022, at 12:26 PM, Richard Koerner <rjkinpb@SBCGLOBAL.NET>
>> wrote:
>>> 
>>> Dennis H. was the guy that explained it to me when I had the problem.
>> Most probably the issue is old fuel tank; gunk builds up at screen at
>> outlet.  Fuel pump tries to do the best it can, but the result is
>> cavitation in fuel pump (noisy and the gurgling....and vapor bubbles in
>> fuel downstream, which fuel injectors Hate!)  Sure, back-blowing with a
>> clean rubber hose (lung power only) into fuel tank may temporarily dislodge
>> some crud and that is OK for an emergency fix while on the road.  But the
>> root cause is probably gunked up screen outlet.  Fancy fuel pumps....cheap
>> fuel pumps....they will all cavitate creating noise and poor motor
>> performance.  Especially noticeable on hot days or higher elevations as
>> gasoline vapor pressure changes.  BTDT.  After new fuel tank (new crossover
>> tubes too), my fuel pump is silent, and excellent motor performance.
>>> 
>>>   On Sunday, September 4, 2022 at 09:10:38 AM PDT, Rob <
>> vwrobb@gmail.com> wrote:
>>> 
>>> I bought an 84 Westy some years back with a real noisy pump. The guy
>>> who sold it to me told me he had tried to figure it out, it was a new
>>> pump & he'd covered it with something to quiet it down but it was
>>> still noisy.
>>> I put a new gas tank in and that cured the noise problem! I opened the
>>> old tank but saw nothing wrong..
>>> 
>>> Rob
>>> vwrobb@gmail.com
>>> 
>>> On Sun, Sep 4, 2022 at 6:35 AM Eric Caron <ericcaron96@comcast.net>
>> wrote:
>>>> 
>>>> So, both pumps sound unhappy when hooked up though a bit better with
>> the new gas filter.
>>>> 
>>>> Is there a good way to bench test my fuel pump to see if quiet when not
>> hooked to tank?
>>>> 
>>>> I’d like to know if I just have some loud unhappy sounding fuel pumps
>> or if it is something to do with my tank.
>>>> Concerns me that this new Bosch pump sounds as unhappy as my current
>> Amazon one I just removed.
>>>> 
>>>> Considering asking a friend to hook up power from an extra battery I
>> have here, to bench test, but would need to run gas as I test.
>>>> 
>>>> Crazy idea?
>>>> 
>>>> Why do it?
>>>> 
>>>> I’m concerned that crud might be getting to my engine perhaps sticking
>> fuel injectors.
>>>> Also the sound of the pump is creepily like the starting sound of a
>> differential with gears starting to wine.  Every time I hear that sound as
>> we come to a stop my heart skips a beat.  After loosing three differentials
>> all starting with that sound I just don’t want to hear it every time I go
>> out for a ride.
>>>> Anyone got a new old Bosh fuel pump or a good used one that is quiet?
>>>> 
>>>> Eric Caron 85 GL  auto
>>>> 
>>>> 
>>>> 
>>>>> On Sep 3, 2022, at 11:34 AM, OlRivrRat <OlRivrRat@COMCAST.NET> wrote:
>>>>> 
>>>>> On 3 Sep , 2022, at 8:27 AM, Eric Caron <ericcaron96@COMCAST.NET>
>> wrote:
>>>>>> 
>>>>>> I’m planning to try to blow back with air compressor to see if that
>> even temporarily changes the sound.
>>>>> 
>>>>>        Compressed Air for that purpose should not be more than Lung
>> Pressure >
>>>>> 
>>>>> Clamp the hose between Tank & Fuel Pump, connect a long clean hose to
>> that hose & gently blow with mouth
>>>>> 
>>>>> as needed to hear bubbles in tank with GasCap removed ~
>>> 
>>