Soft Dash V8 Fuel Pump Relay Location

Hi all, I hope someone can help.

My soft dash V8 broke down yesterday and the AA guy said it's probably the fuel pump relay that's gone. He ran a switched live to the pump to get me going but I obviously want to fix it properly.

Where abouts is the relay and what colour is it? Are there any other suspects?

Many thanks in advance.

Off the top of my head...under the passanger seat and I think it's silver....Nope - thats an earlier Classic...

Try behind the Drivers side Kick panel on the A Frame....two top relays one is the fuel pump the other is the Load Relay.....you could also look at the inertia switch too...

No idea of relays in a soft dash, Saint is probably right. If you can't find them or not sure you could try just turning on the ignition - you should hear 3 clicks as relays energise, these will be main efi power relay, fuel pump relay and ABS power relay, you'll probably also hear the ABS pump run. If you dont hear 3 clicks you have a dodgy relay.BTW IIRC the efi power relay and the fuel pump relay both have a diode (or is it a choke??) and aren't just plain ordinary relays. A normal relay will be fine as a temporary measure but get the right part for the job or you could have trouble, at least that's what I understand but hopefully somebody who knows for sure will be along to confirm.

You're right Kev, they did have a diode in the coil side of the relay - I have no idea why, not a electrical man....maybe Wammers or Datatek could answer why!!

Saint.V8 said:

You're right Kev, they did have a diode in the coil side of the relay - I have no idea why, not a electrical man....maybe Wammers or Datatek could answer why!!

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I vaguely remember reading somewhere that a diode is in there to prevent voltage spikes or feedback or something so that sensitive components (like the ECU) can't be damaged if there is a problem.

Saint.V8 said:

You're right Kev, they did have a diode in the coil side of the relay - I have no idea why, not a electrical man....maybe Wammers or Datatek could answer why!!

Click to expand...

The diode prevents back EMF causing a reverse polarity voltage spike when power is removed from the relay. Fitting a relay without the diode could cause damage to the drive transistor the first time you try it, so not to be recommended.
You can fit your own diode to a standard relay, let me know if you want details.

Datatek said:

The diode prevents back EMF causing a reverse polarity voltage spike when power is removed from the relay. Fitting a relay without the diode could cause damage to the drive transistor the first time you try it, so not to be recommended.
You can fit your own diode to a standard relay, let me know if you want details.

Click to expand...

Thanks for the concise explanation, I shall remember that for future reference. It's good to be able to fill in the gaps in my understanding. Cheers.