[v12-engine] Cranking but not starting

47000 miles, 1992 XJ12. Ran well, then started stopping.
Would run again after a while. Fuel pressure measured at 28
psi instead of 34. Finally stopped and had to fix it
outside of home area. Changed fuel pump, filter and O2
sensor. It ran like a scared rabbit for 104 miles. When it
stopped that time, I got it started again, but it only ran
for a few minutes. After that it has never run again.
Towed home from Yellowstone Park (600 miles and $2400). I
replaced one of the coils, the A bank, in the rear, and
moved it up the throttle stand, further off the engine
before I started the diagnostics. Spark from each of the
coils wires and then from a park plug on each of the banks.
Fuel spews from the rail connection when disconnected. Reset
the inertia button inside the car.
I have no other idea what to do. Any thoughts?–
aseeling
Buena Vista, United States
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Fuel pickup.

– KirbertOn 25 Jul 2013 at 12:01, Alan Seeling wrote:

47000 miles, 1992 XJ12. Ran well, then started stopping.

I have no other idea what to do. Any thoughts?

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

In reply to a message from Kirbert sent Thu 25 Jul 2013:

I’m not familiar with the term ‘‘fuel pickup’’…? Could you
be a bit more specific, I’ve not worked on this before.–
The original message included these comments:

Fuel pickup.
– Kirbert

47000 miles, 1992 XJ12. Ran well, then started stopping.


aseeling
Buena Vista, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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In reply to a message from Alan Seeling sent Thu 25 Jul 2013:

OK, read up on the fuel pickup, duh. The '92 XJ-12 has a fuel
tank that seems encased in a fiberglass housing. How is this
tank removed? Does it need to be for the screen to be
cleaned? Can the tank be cleaned out effectively or should a
new one be installed? Are there any short cuts to this
process?–
The original message included these comments:

In reply to a message from Kirbert sent Thu 25 Jul 2013:

Fuel pickup.

47000 miles, 1992 XJ12. Ran well, then started stopping.


aseeling
Buena Vista, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Alan,

It sounds like your 1992 is the XJ40 design (single fuel tank, with a

more boxy look) and not the Series III (two fuel tanks, more curved design).

If that is correct, the you might get additional help on the XJ40 list

since this sounds like it is more a model specific issue and not a V12
issue.

Regards,

Paul M. Novak

1990 Series III V12 Vanden Plas
1990 XJ-S Classic Collection convertible
1987 XJ6 Vanden Plas
1984 XJ6 Vanden Plas
1969 E-Type FHC
1957 MK VIII Saloon
Ramona, CA
P.M.Novak7@gmail.com-----Original Message-----
From: owner-v12-engine@jag-lovers.org
[mailto:owner-v12-engine@jag-lovers.org] On Behalf Of Alan Seeling
Sent: Thursday, July 25, 2013 1:48 PM
To: v12-engine@jag-lovers.org
Subject: Re: [v12-engine] Cranking but not starting

In reply to a message from Alan Seeling sent Thu 25 Jul 2013:

OK, read up on the fuel pickup, duh. The '92 XJ-12 has a fuel tank that
seems encased in a fiberglass housing. How is this tank removed? Does it
need to be for the screen to be cleaned? Can the tank be cleaned out
effectively or should a new one be installed? Are there any short cuts to
this process?

The original message included these comments:

In reply to a message from Kirbert sent Thu 25 Jul 2013:

Fuel pickup.

47000 miles, 1992 XJ12. Ran well, then started stopping.


aseeling
Buena Vista, United States

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

The fuel pickup is a known problem in the 80’s XJ-S with a surge
tank. Your 1992 saloon is clearly a different animal, but earlier
XJ12’s with dual tanks had a very similar problem, and the later XJ-S
with immersed pumps likewise had similar issues.

If you have an external pump proceed as follows:

  1. Drain the tank. You can actually use the pump to help you if
    you’re clever.

  2. Remove the pickup. It’s at the other end of the 1/2" hose to the
    fuel pump inlet.

  3. Remove the plastic screen from the end of the pickup. Throw it
    away.

  4. Reinstall the pickup. Some suggest a new gasket, but I didn’t
    have any problem reusing the old one.

  5. Install a 1/2" inline fuel filter in the line between the pickup
    and the pump.

  6. Next time your car exhibits this behavior, just pinch the lines,
    remove the inline filter, throw it away, and install a new one. You
    will actually be removing crud from your fuel tank when you do this,
    so it won’t keep building up and causing further trouble.

If your car has immersed fuel pumps, I’m not as familiar with the fix
but it involves removing the fuel pumps from the tank, separating the
pump itself from the housing it’s in, and then removing one of the
redundant inlet screens. There’s a screen on the pump itself and one
on the housing, you only need one total, keep the one that looks the
most difficult to plug up.

– KirbertOn 25 Jul 2013 at 12:40, Alan Seeling wrote:

In reply to a message from Kirbert sent Thu 25 Jul 2013:

I’m not familiar with the term ‘‘fuel pickup’’…? Could you
be a bit more specific, I’ve not worked on this before.

The original message included these comments:

Fuel pickup.
– Kirbert

47000 miles, 1992 XJ12. Ran well, then started stopping.

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

In reply to a message from Kirbert sent Fri 26 Jul 2013:

Me and my 1992 XJ12 just paid 4000 in towing and 1200 in
fuel pump and fuel filter issues, nothing helped (stuck in
Montana and home in Central Colorado). It had been stopping
and then starting with no obvious reason for several hundred
miles and then just quit all together. I replaced the fuel
pump and filter. It ran for another 100 miles into
Yellowstone where it totally quit, again. At home I ran
through the diagnostics in Kirby and then replaced the
coils. Turned out that, in Kirby’s book on page 361, there
is, a description of my issue.
He talks about Injector Resister Connections. I had spark,
I had fuel to the top of the injectors, I had everything I
guess, except something to burn in the cylinders. If the
tiny male plug-ins to the resister box unit are at all
fouled or not making contact -ANY OF THEM- the injectors get
confused and fail to deliver any gas.
Kirby advises just pulling the plug, taking an Exacto knife
and splitting the pins (about the diameter of a healthy
tooth pick) just enough to get a tighter connection and
cleaning them. I used so emery paper on the surfaces. I
also used a tiny screwdriver to scar the female holes.
After all the towing and $$$$$$ spent in Montana, she just
started up and has been running since, about a week now. A
$4000 bill for a ten minute fix.
Don’t you just love it?–
The original message included these comments:

47000 miles, 1992 XJ12. Ran well, then started stopping.


aseeling
Buena Vista, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Just to finish out the epic towed saga. When I got home and after going through all the possibilities, I read Jag Lovers Forum’s Experience in a Book,…XJS_Help, Kirby Palm, actually searched it by making it a PDF. The problem was a F–KING Lucus pin plug going into a Bosch Fuel injector box. The ONE of the friggin pins was not making constant contact. That shut the system down. The Fix? An Exact-O blade run down each of the pins, spreading them a bit. 4 years later still no problem.