Problem with hot starting on RS2

[Pantelis Giamarellos]

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Fellow audifans and RS2 listers,

I have a hot starting problem with my RS2.
It started about two months ago when I filled up the fuel tank using a 20 l=
itres can that was once used for olive oil and unfortunately it had lots of=
 sludge in it. A fact that was discovered after lots of it (the sludge) had=
 been siphoned(transfered) into the RS2's fuel tank.

I had to drive 500 Km with the dirty fuel and upon my return I had the fuel=
 tank emptied as much as possible (removing the fuel tank from a quattro re=
quires the disassembly of half the car as most of you already know) and the=
 fuel filter replaced.

Unfortunately it seems though that there still is sludge in the tank and I =
still have problems with the car misbehaving ("coughing" on acceleration) a=
nd mainly, with it being the serious problem, having a hot starting problem=
 which requires around 90 minutes of cooling down time before it restarts.

Removing the dipstick and the engine oil filling cover, unscrewing the expa=
nsion tank's (water cooling system) cover and opening the fuel tank's cover=
 helps with the situation (should I believe that this restores the equilibr=
ium in-between the fuel supply system between the engine and the fuel tank/=
fuel pump/fuel filter and therefore assists into the unblocking/liberating =
of the fuel filter from sludge particles?)

Another thing that has crossed my mind is what on other occasions has been =
suggested for other cars and namely the camshaft position sensor. If you be=
lieve that this might be the case where is this located on the ADU (RS2's) =
engine? Is there  a procedure for testing it?

When the hot start problem appears there is fuel supply (I have checked thi=
s by partially undoing the fuel supply or return lines and then cranking th=
e starter. A spray of gas has ejected from the line with the 17 and 14 mm s=
crews. I do not know if this is the supply or the return line though. The s=
econd line, close to this, is 17 and 17 mm)

Unfortunately my car does not support the diagnostics facility since it is =
modified. It was supposed to be supporting it but unfortunately it does not=
  either with the VAG 1552 or the VAG COM or the VW Tool.

I am planning on visiting my mechanic for a second fuel tank flashing and f=
uel filter change but your suggestions would be of great value.

Thank you in advance for your kind input and suggestions.

Take care
Pantelis Giamarellos

1995 model year RS2 360 bhp by MTM

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