Date:         Tue, 4 Mar 2014 08:42:31 -0800
Reply-To:     Neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Neil N <musomuso@GMAIL.COM>
Subject:      Re: Residual Fuel Pressure: hold for 1 hour?
Comments: To: "SDF ( Scott Daniel Foss )" <scottdaniel@turbovans.com>
In-Reply-To:  <53155752.4030306@turbovans.com>
Content-Type: text/plain; charset=UTF-8

Thanks Scott.

I try not to make assumptions (ha ha), but the fuel pump, tank,
filter, hoses, basically the entire fuel system, were new at time of
engine swap and are "only" 6 years old with less than 70K miles. At
idle, the pump has always made an intermittent noise. I haven't heard
enough Vanagon fuel pumps to say this with certainty, but it sounds
like a cavitation noise (fuel tank has smaller outlet). That noise
gets louder and more persistent in higher ambient temps. (80º+ F )

I have 2 spare pumps, regulators, etc. so am good to go. Assuming the
pump check valve is at fault, and it seems to repeatedly relate to
engine temp, I'd like to figure out why.

IF the pump was poorly built due to a QC issue, I'm sure I'm not the
only one who will experience this issue.

Neil.

On 3/3/14, SDF ( Scott Daniel Foss ) <scottdaniel@turbovans.com> wrote:

> in all cases I would be inspecting carefully what is inside the fuel
> filter.
> It's great to have a spare fuel pump, fuel pressure regulator and ECU to
> try.
>
> I might even rig my own fuel pump cheater switch ..if I thought 1 second
> of pre-run was insufficient pre-run time.
>
> If it was cranking and not firing up hot ..
> as a test I might dump a small cup of raw gas down the intake and see it
> that makes it go VROOOOMMM ...
> thus confirming it's some for of not enough fuel ..
> either fuel being available ..
> or not enough fuel pressure ..
> or not enough injector pulse.

> noisy fuel pump when hot doesn't sound right.
> Gots to have a spare known-good fuel pump.  Tain't possible to do
> effective  home mechanicin' without one.
>
> 'why'...
> how about it's a 20 year old fuel pump with thousands of hours on it and
> it's tired ..


-- 
Neil n

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