Tank Vent follow-up

Steve Northrop blackgpz at rochester.rr.com
Sun Jul 8 17:17:33 PDT 2007

I just go to my local Parts America or AutoZone. There's a whole crapload of 
OEM auto fuel filters hanging on the wall. I picked a nice big one with 90 
degree inlet/outlet. Any auto fuel filter will flow enough for my GPZ. I 
replace it every year for only a few dollars. No problems.

Steve in Western NY
'96 GPZ1100
'02 Daytona 955i
"You Can't Fix Stupid", Ron White

----- Original Message ----- 
From: "Larry Zoia" <phezanthawk at wowway.com>
To: "Jeffrey Walker" <walkerjl at charter.net>; <gpzlist at micapeak.com>
Sent: Sunday, July 08, 2007 7:34 PM
Subject: Re: Tank Vent follow-up

>> I'm not convinced that boring out the inlet and outlet of the filter you 
>> are
>> using will significantly reduce the pressure drop you are experiencing
>> across the filter.  I believe that it is the filter media itself that is 
>> the
>> culprit.
> Either way, the filter is bad ju-ju no matter what the
> exact mechanism of obstruction of flow.
>> Anyway, I bet if you switched the filter to a different model or even 
>> just a
>> new one you'll have better flow.
> This one is new, but yes, I agree as I have had other
> GPZ's in the past and had not encountered this problem.
>>>  Your vodka bottle test is innovative, what I
>> call the bucket and stopwatch method for determining flow rate.
> I find many uses for empty plastic pint bottles of vodka.
> I use them to measure oil for two-stroke fuel mixing,  They can be used as 
> armor and banded together to
> make floatation devices.  I have even used them
> to protect items in boxes I'm shipping.  The plastic bottle is indeed a 
> boon....AND it comes filled with vodka.  What a country!
> (And I'm a
>> pro, I test leak rates of primary containment isolation valves at nuclear
>> power plants, in accordance with 10 CFR 50 Appendix J. see
> Something like Homer Simpson's job?
>> So you have identified one probable cause:  the filter may not flow 
>> enough.
> I'm convinced this is the cause.  I've spliced the fuel line back together 
> and will test it out.  This bike was run
> about 40k without a filter, and I installed the filter upon
> buying the bike and cleaning and rebuilding the carbs.
> The vacuum hose is patent, I'm sure.  I will, however my test ride works 
> out, pull the petcock and at least inspect and probably rebuild it.
> Uh-oh.  I just remembered that I did the vodka bottle
> test with the gas cap open so that I could test one thing at a time.
> I guess a non-measured gross test could be done with
> the gas cap closed to see if the whole tank readily drains.....but I think 
> the cap is okay....unless it's not.
> larry in Michigan 

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