[xj-s] Top Tip to depressurize the fuel system

XJ-S
1

Had to pull the induction manifolds this week to check the
valve clearances and since I like to make myself life easy I
pulled both with the full fuel ring, injectors, balance
pipes etc. in one pice.

So I had to depressurize the fuel system. I�ve found that
the easiest way to to so does not involve fiddling around
with anything in the trunk.

Instead I just start the engine and then pull the knob of
the crash control box in the left door jamb. This seems to
kill the fuel pump and thus the engine dies.

When I then pull the fuel lines I find there is practically
no pressure left in the system and no more than a dribble
from what�s left in the lines will spil.

Saves a lot of time and effort.–
Tierfreund
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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2

In reply to a message from Tierfreund sent Wed 24 Sep 2014:

What is the ‘knob of the crash control box in the left door
jamb’? Never heard of such a thing? Does the 1993 XJS have
one?–
1993 6 Cylinder Automatic Transmission Convertible
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3

In reply to a message from 75Gremlin sent Wed 24 Sep 2014:

there is a fuel kill sensor in the door jamb (little black
plastic bow with a short rod protruding from top. in a
crash, it pops up and kills electricity to fuel pump.

you can gently pull up on this little rod to do the same
thing, then push back in when done–
syzygy
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4

In reply to a message from 75Gremlin sent Wed 24 Sep 2014:

He’s got a V12. Not sure if the 6-cyl has one, it could.
In the US, it is called ‘‘inertia switch’’
Cuts off fuel delivery on impact (crash)
Steve–
The original message included these comments:

What is the ‘knob of the crash control box in the left door
jamb’? Never heard of such a thing? Does the 1993 XJS have
one?

–
'95 XJS convertible - V12 6.0L
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

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5

In reply to a message from sbobev sent Wed 24 Sep 2014:

my 96 XJS wuth the AJ16 has it.–
1996 XJS 2+2 Convertible with 4.0L AJ16
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6

In reply to a message from Tierfreund sent Wed 24 Sep 2014:

Very clever Tierfreund !
Sure does saves time and effort.

Best
Aristides–
The original message included these comments:

Instead I just start the engine and then pull the knob of
the crash control box in the left door jamb. This seems to
kill the fuel pump and thus the engine dies.
When I then pull the fuel lines I find there is practically
no pressure left in the system and no more than a dribble
from what�s left in the lines will spil.
Saves a lot of time and effort.

–
Aristides Balanos, 1986 XJ V12,VDP - www.e-psychi.com/jaguar
Roussillon, Provence, France
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

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