Fuel pump question

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jg - 19 May 2008 05:46 GMT

This must have been asked some time already, but I can't find a
reference - (87 RR efi) when the in-tank fuel pump packs up does it
usually give some warning or just instantly die?
TIA

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Austin Shackles - 19 May 2008 11:45 GMT

>This must have been asked some time already, but I can't find a
>reference - (87 RR efi) when the in-tank fuel pump packs up does it
>usually give some warning or just instantly die?
>TIA

sometimes it'll go slow, so that it'll only idle and not run above idle, I
had one do that. Mostly, though, I think they just stop supplying
enough-or-any fuel and the engine stops. Of course, there are other reasons
for non-supply of fuel so try checking the pump by arranging an independent
12V feed.

Note though that if the pump runs it's not necessarily delivering (enough)
fuel.

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Pete M - 19 May 2008 12:43 GMT

>> This must have been asked some time already, but I can't find a
>> reference - (87 RR efi) when the in-tank fuel pump packs up does it
[quoted text clipped - 9 lines]
> Note though that if the pump runs it's not necessarily delivering (enough)
> fuel.

I found with one of mine (an 87) that occasionally it was necessary to
put a 12v feed to the fuel pump fuse, that would normally kick the pump
into action. The relays can get a bit sticky with age and a proper 12v
feed for a couple of seconds will normally get 'em going. Must be a
reasonably common bodge because an AA man did it straight away when I
couldn't get it going (it was raining, I was dressed smartly and I
couldn't be arsed ferreting about)..

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jg - 19 May 2008 14:17 GMT

>> On or around Mon, 19 May 2008 04:46:31 GMT, jg <jg@nospam.com>
>> enlightened
[quoted text clipped - 25 lines]
> couldn't get it going (it was raining, I was dressed smartly and I
> couldn't be arsed ferreting about)..

Thanks for comments. I ask because I know they have a finite life and
this one must be somewhere near the end - I think it's "only" on the
second one in 400,000km. The car was running badly mainly due to a
slipping alt belt. When that slipped it seemed like a fuel problem and
it still misfires a little with A/C + lights on and very occasionally
cuts out for a few seconds (even with no elec. load always at the same
place... no, it's not the pub).

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Lee_D - 19 May 2008 15:42 GMT

>>> On or around Mon, 19 May 2008 04:46:31 GMT, jg <jg@nospam.com>
>>> enlightened
[quoted text clipped - 33 lines]
> seconds (even with no elec. load always at the same place... no, it's not
> the pub).

Sounds like a loose connection.

I had a loose connection on a '83 RRC at the coil which generated similar
symptoms. That was a carb fed V8 mind. I don't know whats on the '87 variety
but if it had a coil then check the leads / connections are tight and clean.

Often such faults are the aftermath of dealers jet washing engine bays.

Lee D

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jg - 19 May 2008 23:52 GMT

>>>> On or around Mon, 19 May 2008 04:46:31 GMT, jg <jg@nospam.com>
>>>> enlightened
[quoted text clipped - 44 lines]
>
> Lee D

Possible, but I do look out for those. It's just that I know the fuel
pump's time must be near and wondered if the "happenings" (which are not
in themselves too concerning) could be symptoms.

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Dougal - 20 May 2008 00:08 GMT

>>>> On or around Mon, 19 May 2008 04:46:31 GMT, jg <jg@nospam.com>
>>>> enlightened
[quoted text clipped - 44 lines]
>
> Lee D

And with a RR of this vintage one of the possible causes is loose/dirty
connections to the over-run relay mounted somewhere near the LH front
suspension turret. Those cases that I have seen have caused a fully
on/off situation but I can imagine an intermittant result too.

This relay is controlled by a vacuum switch at the rear of the RH rocker
cover. I've had problems with that as well.

Don't overlook the fuel pressure regulator, either, but I don't think
that the symptoms as I understand them point to that.

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jg - 20 May 2008 00:46 GMT

>>>>> On or around Mon, 19 May 2008 04:46:31 GMT, jg <jg@nospam.com>
>>>>> enlightened
[quoted text clipped - 55 lines]
> Don't overlook the fuel pressure regulator, either, but I don't think
> that the symptoms as I understand them point to that.

Have to look up what over run relay does. That's the car's RH or yours
from the front?

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Oily - 20 May 2008 10:59 GMT

"jg" wrote............

> Have to look up what over run relay does. That's the car's RH or yours
> from the front?

Car's left, nearside, kerbside, passenger side or on your left if you're
sat in the driver's seat. :-)

Martin

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Dougal - 20 May 2008 18:04 GMT

>>>>>> On or around Mon, 19 May 2008 04:46:31 GMT, jg <jg@nospam.com>
>>>>>> enlightened
[quoted text clipped - 59 lines]
> Have to look up what over run relay does. That's the car's RH or yours
> from the front?

The relay is energised in normal running. If a wire drops off, for
example, the fuel is cut off. Function is to cut off the fuel on the
over-run (high vacuum) controlled by the afore-mentioned switch.

RH/LH are conventionally from the driver's seat looking forward.

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jg - 21 May 2008 00:29 GMT

>>>>>>> On or around Mon, 19 May 2008 04:46:31 GMT, jg <jg@nospam.com>
>>>>>>> enlightened
[quoted text clipped - 66 lines]
>
> RH/LH are conventionally from the driver's seat looking forward.

I found it using the manual, guess it depends on RH/LH drive - it's RH.
Haven't had a look yet - quite confident it won't happen until go "there".
Sounds like I'm making it up, but it's a RH long bend take pretty slow
then up a moderate long ramp onto the freeway. Fine round the bend, fine
up the ramp under mod acceleration then as it levels off and you start
to ease up... silence. Then away we go again. Gearbox is so smooth I
often have trouble guessing what gear it's in or whether the torque
converter has locked - a mechanical action I believe. There are steeper
hills, faster speeds, similar bends etc, but nah, only here only sometimes.

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