[T3] Fuel Filter & Overheating

[Dave Hall]

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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