Date: Wed, 13 Feb 2013 19:31:24 -0800
Reply-To: neil n <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: neil n <musomuso@GMAIL.COM>
Subject: Re: Black Nylon Fuel Return Hose Kink. Opinions? PICS.
In-Reply-To: <511c554e.e6893a0a.53fa.ffffb1fcSMTPIN_ADDED_MISSING@mx.google.com>
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No, sadly, I was serious about the kinked pipe causing poor flow.
;^) Thinking more, I "see" what you mean. i.e. if that pipe were,
say, closed more than 50%, as long as the fuel tank is properly
vented, it should make no difference to the pump. (he says with a
slight question mark)
The fuel pump noise is something may have been there all along. The
air cooled engine was noisier at idle. After I got the Jetta engine
running "right", I noticed the noise.
The fuel pump was new at time of swap as was fuel tank, seals etc. I
deleted the pre pump filter, images:
https://picasaweb.google.com/musomuso/FuelFilterUpgrade
in hopes of quelling the racket (albeit intermittent and not THAT
loud). The noise, which I assume is due to cavitation, gets worse on
really hot days.
Neat tip on the Kerosene. Would not have known that one!
The pump is isolated via the OEM rubber bonded mounts.
> If God forbid the bearings are
> chattering, it will scream in pain and have low output and probably high
> draw (since the shaft is rolling around the inside of the bearing instead of
> rotating in it). Dreadful horrifying sound.
What kind of current draw would one look for? I saw ~ 2 - 3 Amps on
the fuel pump/HO2S circuit at idle - 2K RMP.
Neil.
On Wed, Feb 13, 2013 at 7:08 PM, David Beierl <dbeierl@attglobal.net> wrote:
> At 09:46 PM 2/13/2013, neil n wrote:
>> I'll be curious to see if the pump noise ceases.
>
>
> I thought you were joking about pump noise. If the pump is cavitating, it
> will be because of a problem on the inlet side. If the kinked line is
> causing noise it will show up right at the kink (but I very much doubt it is
> with such a low flow rate). Get out your stethoscope and listen to it.
>
> If the pump itself has worn to the point where it's noisy, letting it pump
> kerosene through short hoses into and out of a quart can ought to show that
> up.
>
> Are you familiar with the cavitation noise? A bit hard to describe, but
> sort of a high-pitched buzzing/singing. If God forbid the bearings are
> chattering, it will scream in pain and have low output and probably high
> draw (since the shaft is rolling around the inside of the bearing instead of
> rotating in it). Dreadful horrifying sound.
>
> Is the pump resting on something that will transmit noise around the rubber
> mounts?
>
> Does pumping fuel from a coffee can via a short hose kill the noise? If so,
> look to the tank inlet filter or other obstruction in the inlet line.
>
> Yours,
> David
--
Neil n
65 kb image Myford Ready For Assembly http://tinyurl.com/64sx4rp
'88 Slate Blue Westy to be named.
'81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/
Vanagon VAG Gas I4/VR Swap Google Group:
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