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low voltage to fuel pump !!!
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Old 17 Sep 2012, 07:12 PM   #1 (permalink)
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Angry low voltage to fuel pump !!!

Just had the RAC hot wire my fuel pump.
When I went to start the car it was turning over but not firing at all.

RAC test battery and its perfect over 12v.
Test for spark and it does produce a spark.
Tested voltage on fuel pump and with it connected it only produced 3v, unplugging it produced 12v.
He tried to locate the relay for the pump but couldnt find it so he hot wired it to the fuse box next to steering wheel.

Any ideas what is causing this loss in power and where the fuse relay is hiding?

Im getting really sick of this car, but I still love it.

Cheers
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Old 17 Sep 2012, 09:36 PM   #2 (permalink)
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Re: low voltage to fuel pump !!!

have a look at the connections under the rear seat and to the pump, they are known to corrode.
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Old 17 Sep 2012, 09:45 PM   #3 (permalink)
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Re: low voltage to fuel pump !!!

Quote:
Originally Posted by bugeye_bob View Post
have a look at the connections under the rear seat and to the pump, they are known to corrode.
They looked fine when the RAC unplugged them, I'll double check them at the weekend.

Any ideas where the fuel pump relay is located, its a UK MY99 Turbo 2000?

thanks
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Old 18 Sep 2012, 10:00 AM   #4 (permalink)
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Re: low voltage to fuel pump !!!

I'm sure its in the front passenger footwell, under a me kick plate, below the glovebox.
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Old 18 Sep 2012, 06:08 PM   #5 (permalink)
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Re: low voltage to fuel pump !!!

Quote:
Originally Posted by bugeye_bob View Post
have a look at the connections under the rear seat and to the pump, they are known to corrode.
Thought I would have a go at finding the connections under rear seat, I found a small black clip which has white and black wires in it on the same side as the fuel pump, is this the one you are referring to.

Also how do you completely remove the bottom of the seat??
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Old 18 Sep 2012, 06:13 PM   #6 (permalink)
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Re: low voltage to fuel pump !!!

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Originally Posted by 2002pete View Post
I'm sure its in the front passenger footwell, under a me kick plate, below the glovebox.
Not sure what you mean, I've had the plastic trim off that goes along the passenger sill and halfway up to the dash, pulled the carpet back which reveals a metal plate which im guessing thats where the ECU is.

I spoke to Revolution this morning they said the relay is quite far up in the dash and is easier to get to by removing the dash.
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Old 19 Sep 2012, 04:54 PM   #7 (permalink)
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Re: low voltage to fuel pump !!!

I found the fuel pump relay (i think going off other forums) its driver side right up behind dash past the fuse box, there is 3 relays not sure what does what. Green, Brown and white.

How would I test the relay is it case of just swapping the connectors around?

Thanks
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Old 19 Sep 2012, 05:53 PM   #8 (permalink)
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Re: low voltage to fuel pump !!!

Found this ... Link: fuel pump relay 1998 turbo 2000

Relay colour ... Link: Just merged my own 98RS to 06WRX harness, some problems - Subaru Impreza GC8 & RS Forum & Community: RS25.com
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Old 19 Sep 2012, 06:25 PM   #9 (permalink)
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Re: low voltage to fuel pump !!!

cheers, i'll try the first link out tomorrow.
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Old 21 Sep 2012, 07:48 AM   #10 (permalink)
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Re: low voltage to fuel pump !!!

I've got another problem which could be related. Just parked up and switched ignition off pulled key out and the engine is still running, i've had to disconnect the fuel pump. One of my friends thinks its a relay problem. What do you think?
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Old 22 Sep 2012, 02:42 PM   #11 (permalink)
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Re: low voltage to fuel pump !!!

Just got back from having the relay and connections checked over, both are ok, been told need to get it to an auto electrician
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Old 29 Sep 2012, 01:18 PM   #12 (permalink)
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Re: low voltage to fuel pump !!!

Fixed, apparently the immobiliser circuit for the fuel pump had burnt out, so the auto electrician removed that part of the circuit.
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