38 How do I check (and remove) for the inline FI filter in early A2 cars, and how do I remove it if there.
Description
This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
38 How do I check (and remove) for the inline FI filter in early A2 cars, and how do I remove it if there.
A: This filter is installed by VW apparently to filter out
contaminants remaining from manufacture that are in the fuel system *after*
the main fuel filter, but will continue to catch junk the main filter misses.
Pre-Digifant/Motronic A2's are affected (CIS, CIS-E).
Failure to remove this bolt may clog the system.
This filter is located inside the 'banjo bolt' that
connects the fuel line to the fuel distributor.
This bolt is hollow, and the filter, about the size of a long pencil eraser,
is hiding inside.
Here is the procedure I used to check for and remove the filter I
found in the GTI:
- Buy two copper washers to replace the ones on the banjo bolt,
or you will suffer a fuel leak like I did.
- HAVE A FIRE EXTINGUISER WITHIN ARM'S REACH!!
- Start engine, and pull the fuel pump fuse while it is running
to depressurize the fuel system, or a faceful of gas awaits.
- Remove the banjo bolt associated with the incoming fuel line
(don't confuse it with the return line) with a 17 MM wrench.
A small amount of fuel will dribble out, nothing a paper towel or
two can't handle.
- If your bolt is hollow, celebrate and put everything back together.
Torque bolt per Bentley's spec for your car.
- If you see something inside, try to poke it out through the side
holes in the bolt. That failing, whip out your drill with a 1/4
bit, and *gently* apply torque with the bolt supported in a vise.
In my case, the bit grabbed the filter, and I was able to withdraw
it. Admire the filth, then clean the bolt well before reinstalling
it with the new washers.
Alternatively, you can also buy the new screw
Part nos: Screw = N 0210715 Washers = N 0138128.
- Don't forget to put your fuel pump fuse back, or the car won't start!
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