HELP!! please ......

[TVRThomo]

Car would not prime at the w/e, turned the key and no sound. Called the AA out (car was stuck in town) and the AA guy could not figure out which relay did what. He eventually (tested)sent a signal though each individual relay location manually causing the lights to come on, engine fans to fire up, dash lights etc etc but he could not work out which one was for the fuel pump ? At this stage he thought maybe a faulty fuel pump ? To prove this he first of all checked that the fuel cut-off switch was not the problem (it wasn't). He then connected a wire to a 20 amp fuse and then piggy backed it onto one of the bunch of wires (yellow i think) going into the cut-off swich (Black box....emersha switch i think he called it??). This then gave me a constant feed straight to the pump which got me home. Before I call out an auto electrcian can anyone tell me which is the relay for the pump from the picture below and any comments would be much appreciated.

Car is a 1994 430

[hut49]

They're aluminium coloured and usually floating around the cubby hole!

See here

[TVRThomo]

Like this ? Should there be two ?

[hut49]

Yup - but deffo two - they're identical. Feel around carefully to avoid dislodging any other connections! I know, easier said than done! Good luck

[that daddy]

the relays holders are blue & other is black,there should be two empty sockets attached too.if there faulty replace both.

[TVRThomo]

Why two ? Do they both do the same job

[chim666]

TVRThomo said:

Why two ? Do they both do the same job

IIRC, one powers the fuel pump, the other provides feed to the ECU.

Reseat them or change them both anyway - part number Bosch 0332014112

[chassis 33]

Almost...

[geek mode]the relay with the brown and orange wires coming out of it powers the injectors, AFM and a feed to the ECU. The relay with the white/purple and white/orange wires coming off it feeds the fuel pump and carbon canister (white purple wire) and the lambda heaters (white/orange)[/geek mode]

Regards

[chim666]

chassis 33 said:

Almost...

[geek mode]the relay with the brown and orange wires coming out of it powers the injectors, AFM and a feed to the ECU. The relay with the white/purple and white/orange wires coming off it feeds the fuel pump and carbon canister (white purple wire) and the lambda heaters (white/orange)[/geek mode]

Regards

Oh c'mon...it's not a bad try !

[chassis 33]

Yeah, and you get a gold star for the Bosch part number!!!

Regards
Iain

[TVRThomo]

Thank you all, will replace both tomorrow

[Griffter]

chassis 33 said:

Almost...

[geek mode]the relay with the brown and orange wires coming out of it powers the injectors, AFM and a feed to the ECU. The relay with the white/purple and white/orange wires coming off it feeds the fuel pump and carbon canister (white purple wire) and the lambda heaters (white/orange)[/geek mode]

Regards

Surely the ecu powers the injectors direct? My ecu has a common positive to the injectors, and a switched earth for each bank (think it's that way round).

[chassis 33]

Nope, it the relay powers the injectors and, as you say, it is a switched earth control by the ECU.

Wiring diagram here http://homepages.nildram.co.uk/~eliot courtesy of eliot, and it checks out against loom in my 1995 car.

Regards
Iain