[T3] Fuel Filter & Overheating

[Max Welton]

Just one of the reasons I took my 68 back to FI. ;-)

Max Welton

http://www.maxwelton2k.net/

--- On Mon, 9/19/11, Mike Fisher <fisherfarms at gmail.com> wrote:

From: Mike Fisher <fisherfarms at gmail.com>
Subject: Re: [T3] Fuel Filter & Overheating
To: type3 at vwtype3.org
Date: Monday, September 19, 2011, 5:18 PM

It took 20 minutes at Rest Stops in CA with my stock '67 before it
would start.  My stock '69 doesn't have that problem!

On Mon, Sep 19, 2011 at 3:46 PM, Dave Hall <dave at hallvw.clara.co.uk> wrote:
> The original system simply uses a filter in the pump (engine mounted type
> for carbs) and the mesh sock in the fuel tank.  I've never had any problems
> with that, but it's not usually as hot here in the UK anyway.  I wouldn't
> want a filter over the engine, simply for safety reasons, though even the
> pipes can leak and spigots can come off the carbs.
>
> It may be the heat soak is evaporating fuel from the float bowl.  The carb
> chokes cool down after a run, and then you can be trying to start with a
> rich mixture even though the engine is still fairly warm.  VW say to crank
> and gradually press the accelerator while cranking, for a start from warm
> (carbs).
>
> Dave.
> UK VW Type 3&4 Club
> ===================
>
> -----Original Message-----
> From: type3-vwtype3.org-bounces at lists.vwtype3.org
> [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Know One
> Sent: 19 September 2011 06:03
> To: T3
> Subject: [T3] Fuel Filter & Overheating
>
> A couple of fuel filter questions.
>
> Where is the stock fuel filter located in a '67?
>
> Our local VW group (State Route 49 Vdubs) has a tech day once a month where
> a member who has a smog shop invites VW folks over to work on their cars,
> help others, and just generally gather and talk VWs.
>
> I took mine there last Saturday to check compression:
> 1 - 110
> 2 - 120
> 3 - 120
> 4 - 115
>
> Which seems to be good overall. I'll check again after a valve adjustment
> and tune up.
>
> I have been having problems with fuel starvation (vapor lock?) after a long
> drive (engine hot) with it getting hot and not being able to start again
> after stopping.
>
> So I asked around for opinions. A suggestion was that as I have the filter
> located just before the fuel pump the air in the filter contributed to fuel
> starvation. My take on that theory is that its plausible. All is well as
> fuel is flowing while running. When stopped, the air already in the filter
> expands with the heat to create more vapor which displaces liquid fuel in
> the line making it difficult to start until the vapor clears.
>
> A suggestion was to locate the filter after the pump where the vapor would
> be forced out of the filter avoiding the vapor problem. Push fuel through
> the filter instead of sucking it through.
>
> The fuel line from the pump to the T on the forward end of the engine runs
> near the oil filter getting it extra hot. One suggestion was to re-route the
> line to be away from the hot oil filter cover, which would be easy enough.
> One other suggestion was to shield the fuel line with something like a
> larger diameter hose.
>
> Some are really distrustful of a fuel filter in the engine bay at all, so
> they locate it elsewhere. I can eliminate the filter in the engine bay
> easily enough as I have another immediately below the tank, so that's my
> first change to make.
>
> I checked my Bentley, but since it's for 68 & later (FI) it doesn't apply.
>
> Jeff '67 Sqbk
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