i have rs conversion just changed turbo fuel pump just runs on and on bought knew fuel relay pink five pins went under dash the one that is in is black with four pins middle one missing does this mean my ecu is nackered as when car is hot wont start tested alternator its nackered came across relay susing
pump fault as car is over fueling and wont start when hot put on jump leads when hot starts no problems and jerks like mad when on motorway turbo goes on and off bouncing me allover will not hold psi help please


pump does not come on with pink relay plugged in

 

Sounds like the relay may have burned out and welded shut between the two output contacts.try a new relay first or shove your multimeter on ohms and check resistance between the two output pins,if it's a very low figure or your meter goes beep then it's short circuited.there should be a little diagram on the side of the relay,your looking for the switched contacts.

The miss on the motorway could be the relay occasionally cutting in and out.

Like I said to testosterone,it's been years since I had an rst but a few things still jog the old memory bank!!!

 

Right,just re read this.it looks to me like there's a bit of stray wiring somewhere in the car,the four pin relays effectively acting as a short between the two pins and causing the pump to run as soon as the relay energises,like you said,no switching or control.

It could be Haynes manual time etc to identify the wires and make sure their all there and connected correctly ,it's not hard and you seem to know what your doing.I'd be amazed if there's any burnt ecu's etc,I'm sure it's just a plain old wiring issue.

Generally with a relay you get permanent live,earth,switched live and then load out,there should be a million and one people who can give you the diagram if Haynes fails or even talk you through it.

I'd guess the extra pin on the relay is fed from the ecu somewhere to tell the pump when to shut off etc rather than just purely fed from the ign switch although without a diagram I'm a bit stumped.

 

Memory jog again!!!I'm sure it's a four pin holder with a separate wire for the 5th pin,find that wire!!!black with a red stripe iirc?Christ I'm going back 10-12 years now!!!!

 

black and red spot on colours will trace it spoke to old owner it was conned ten years ago and parked up with complete rewire

 

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looks clean mate,nice conversion.Hope it works out for you,if you can get hold of a haynes manual wiring diagram i can talk you through it?its been a while for me!!!!