[T3] Fuel Filter & Overheating

[Max Welton]

Were 71 type-3s still carbed in the UK?

Max Welton

http://www.maxwelton2k.net/

--- On Tue, 9/20/11, Dave Hall <dave at hallvw.clara.co.uk> wrote:

From: Dave Hall <dave at hallvw.clara.co.uk>
Subject: Re: [T3] Fuel Filter & Overheating
To: type3 at vwtype3.org
Date: Tuesday, September 20, 2011, 4:02 AM

The stock '69 is fuel injected, so that is unlikely to see a vapour lock
problem.  The ring main will be purged of the vapour from local hot-spots
very quickly.

My stock '71 is carbed and I don't remember having problems like this, but
as I said, I doubt we get the heat or height to be troublesome here.  I
recall being in Yosemite in the mid-60s with a rental Impala (pillarless -
remember them?) and we (well, my Dad as I was a teenager then) had an
episode of vapour lock.  Incidentally, there is a lot of concern in the UK
with using petrol (gas) with ethanol in light aircraft, rather than the
usual avgas, due to the increased chance of a vapour lock at higher temps
and altitudes, as the vapour pressure of the ethanol mixture is lower, so
evaporates easier.   

Pushing rather than 'sucking' the fuel certainly helps.

Keith's info about his mechanical fuel pump diagnosis makes interesting
reading (as usual of course!).

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 Mike
Fisher
Sent: 20 September 2011 00:18
To: type3 at vwtype3.org
Subject: Re: [T3] Fuel Filter & Overheating

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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