[Vwdiesel] Fuel hose routing help.

[Drew MacPherson]

Here's a snap from EPC for your year:

http://scirocco.cs.uoguelph.ca/gtd/JEG-89-2-01-68-00.JPG

89 uses a pre-heat valve in the filter - this re-circulates return line
fuel in the filter below 5C or therabouts to help prevent waxing or
gelling.

The correct routing for models with pre-heat is:

feed line from tank (this is the larger diameter pipe) to filter inlet.
Filter outlet goes to pump inlet - banjo at lower right front of pump (11
in picture)

return line from pump (top of pump) goes to pre-heat valve on filter
(arrow on vlave indicates correct flow)  Other end of valve is return line
to tank (smaller pipe.)

It sounds like someone has swapped your filter for one without preheat
valve.  The routing is similar, except that the return from the pump goes
straight into the return line to the back of the car (smaller pipe.)

Leaks at the supply line allow air into the system, which will make for
hard cranking, warm or cold.  Leaks at the return side can allow air to
enter the system as well, especially if the factory check valves have been
removed (A2/A3 only)

HTH,

Drew

On Sat, 1 Mar 2003, Jeff Rakus wrote:

> This is a multi-part message in MIME format.
> --
> [ Picked text/plain from multipart/alternative ]
> Hi All,
>
> I need to know what the fuel hose routing should be on my '89 Jetta .
> There are two hoses from the back , one has a t fitting that is blocked off and
> it connects to the injector pump on the left lower side as you face the car.
> This hose seems to be wet with fuel near the pump. The other hose from the back
> goes into the filter and and from the output of the filter it goes into the top of
> the injector pump marked out. Since the engine has been replaced with what I
> believe is a older ~ '85 or '86 engine with the valve maint. sticker on the cover,
> Perhaps the hoses are incorrectly placed. It's been hard to start when it was cool
> and with the temp today in the midlin' 30's even with a fully charged battery it would not go.:~(
> So I await your verdict. The Bentley has no photo's of the hose routing.
> TIA Jeff
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