correct fuel pump relay 4.2

[911turbotastic]

Evening, can anybody give me the correct part number for my 4.2 fuel pump relay. The one in there now is marked as seimens but nobody i call seems to be able to cross ref it. I did find a thread on here that mentioned that its a bosch part, but cant find the thread again :-(

[mattrosersv]

It is not a standard automotive relay (at least my local auto electrical place did not have them and it was not in any of their catalogues).

It is a relay used in a Land Rover as part of the immobiliser system. It differs from the easily available relays as the main circuit is live when the relay is not powered.

Part codes:
AMR1088
V23134-M52-X186

Should be available from the likes of Rimmers or Famous Four.

Good Luck,

Matt

[Tanguero]

There must have been more than one type fitted because mine is a bog standard 5 pin automotive relay (1997 4.2). Not the M1317 type shown on TVR Power. I have just taken the case off the relay to check and mine is absolutely standard.

[mattrosersv]

Interesting. Mine is an early car 97 4.2 AJP. The relay is the only brown one in the fusebox.

You can clearly see from the diagram on the relay that it makes the main circuit to pump when there is no power to the feed terminal. This confused me for a few mins when I was tracing a wiring fault (back to front from any other relay I have used).

Matt

[Tanguero]

Yes - the brown relay is a standard 5 pin relay that uses the second (closed when not energised) contact to make the circuit as you describe.

[mattrosersv]

I'll have to defer to you as I am no auto electrician.

The 'expert' guy in the auto electrical supplies place I went to could not match the relay which iirc (need to check this) is a twin make with a resistor. We both went through his catalogues and there was nothing identical. Both circuits are used according to Cerb wiring diagram.

Curious now so will try and double check this when I get a chance.

Matt

[Tanguero]

Given the vagaries of TVR its entirely possible that we have different relays. TVR Power (and others) list a fuel pump relay that is definately not a standard one - it has a couple of small extra pins on the base for a start. However my brown relay is a standard five pin base and prising the cover off the layout seems to me to be a single pole change over relay with a diode across the coil.