It is possible for a fuel pump which is on its last legs to be finished off
by being run
very low. I suspect it is more to do with lack of cooling than picking up
any crud. But it
is unlikely for a dying fuel pump to get better even tem****arily.
It is quite easy to test though, just measure the quantity of fuel coming
down the return
line to the tank with the fuel pump running.
Oil level warning coming on during extended cranking, or just after
stalling, is normal.
Alarm going off is probably a totally unrelated problem, but be aware that
some people
wire immobilisers in to fuel pump circuits (into the actual supply to the
pump) and
immobiliser relays aren't sometimes man enough to supply the current for
many years.
Easy check is to run 12 volts direct to the fuel pump. Make sure you have
no leaks, as you
will get a spark when you disconnect it! Probably safer just to measure
the voltage at the
pump while its running.
Smiffy
----- Original Message -----
From: <928uk@[EMAIL PROTECTED]
>
To: <928uk@[EMAIL PROTECTED]
>
Sent: Saturday, July 22, 2006 5:52 PM
Subject: [928uk] More trouble
> The latest update on my first 6 weeks of 928 owner****p:
>
>
>
> With a great deal of excitement I picked her up from Dr. A yesterday
evening
> after 3 weeks during which he had done lots of work (cylinder head
rebuild,
> new coil and HT leads, new rad, engine mounts, cambelt and water pump,
> x-pipes etc) and proceeded to head back to Herts. From Stroud to Swindon
she
> went like a dream, and the x-pipes give a much better sound under
> acceleration than the cats.
>
>
>
> Running low on fuel I stopped just before the M4, and as I turned the
engine
> off the alarm went off. Finally managed to stop it by getting out and
> locking the doors, and I filled up. When I came to restart she was
> reluctant, and I assumed the immobilizer was still active. I got her
going,
> but a bit lumpy, and an oil level warning light came on. So I pulled
off to
> the side of the garage forecourt, topped up the oil (which was perhaps a
> little down) and tried to restart her. It clearly seemed to be fuel
supply
> problem as she would not rev properly and was having trouble at idle.
No
> smoke or nasty noises though.
>
>
>
> Thinking it might still be the immobilizer I disconnected the battery
for a
> couple of minutes, and when I restarted her she seemed better, though
not
> perfect. After running her for a few minutes without a recurrence of
the
> previous serious problem I risked heading to the M4. I cruised
carefully at
> 70 for a few miles and seemed fine, so I upped the speed a bit (to
85ish)
> hoping to settle her for the rest of the journey. About 5 miles further
on
> I felt a loss of power and nursed her to the hard shoulder, where she
> laboured at idle and could not be coaxed to rev. Not wanting to fiddle
too
> much I called the AA and (after taking 2 hours to send out someone with
a
> recovery truck and, as far as I could make out, no knowledge of car
> mechanics) they delivered me back to home at about 130 this morning.
>
>
>
> I tried her this morning and initially the same problem, although it
seemed
> to get better the longer she was on, and after a few restarts.
>
>
>
> Could it be related to the fact that I let the fuel run very low before
> refueling and gunk may clogged the pump etc? Any other thoughts or
similar
> experience from those on the list?
>
>
>
> Any would be greatly appreciated!
>
>
>
> Alastair Tomson
|
