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Location:
Casino
Registered:
August 2004
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1JZ Fuel Pump Relay Wiring
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Fri, 28 January 2005 12:00
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Hi Guys,
I need some help with my 1JZ into a Commodore conversion.
I have a JZZ30 Soarer engine and I am in the process of wiring it up.
I do not have the JZZ30 fuel pump relay, it didn't come with the front cut(i believe the relay is in the rear half!!)
Can any help me with what type of relay I need and what wires I need to hook it up to? the relay has a delay timer built into it to prime the fuel rail when shutting off the ignition. It has two stage setting - when it comes on boost it switches to the other setting.
Cheers
Ben
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1JZ Fuel Pump Relay Wiring
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Fri, 28 January 2005 23:27
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This probably won't be that much help as I know SFA about wiring 
When my fuel pump was wired up originally the car would die unless you revved it more than 4000rpm or so. Later, it was rewired off ignition 12V all the way and then it stayed on the whole time until you turn the ignition off. I was told that the standard setup gives it 9v up to 4000rpm or so and 12v after that.
hope that helps 
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ Fuel Pump Relay Wiring
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Sat, 29 January 2005 07:52
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Soarer fuel pump ECUs (relay) have a decent failure rate, are sought after and fetch a few hundred dollars used.
You can bridge B+ to FP in the engine bay diagnostic connector to bypass the FP ECU operation which will cause it to switch to a constant 12V signal with IGN switched on.
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Location:
Sydney
Registered:
February 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Sat, 29 January 2005 08:29
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but wouldnt that be a little dangerous in event of an accident?
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Location:
sydney
Registered:
March 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Sat, 29 January 2005 08:51
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the relay they have is called a fuel pump ecu
this little unit is located at back of car
it controls the fuel pump and also the dual voltage to fuel pump
all in one unit
unles su have one of these units u will not be able to run the fuel pump as standard
i usually run them of ignition
if u have a chaser 1j then its easy but the soarer 1j has a fuel pump ecu
if u want to run the fuel pmup safely then buy a msd rpm activated relay and set it to turn fuel pump on at 200 rpm
this way the pump will turn of when engine stops
otherwise get the fuel pump ecu
they are very hard to find because people bring in the front cut and these sit in the rear cut
chris yr pump was wired up wrong
it was wired up to the fuel pump voiltage control so at 4000 it would switch from 8v ro battery volts
so in yr car it would have 12v up to 4000 then 0v after 4000
theres i proper way to do it but its not cheap
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Location:
Sydney
Registered:
May 2002
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Location:
sydney
Registered:
March 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Sun, 30 January 2005 00:19
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if u look at a cressida it has a big relay and resistor at front drivers inner gaurd area
basically they have put all that stuff into one little unit
the only prob is the soarer 1j does not have an earth trigger
it has a funny signal that only the fuel pump ecu can read
im not sure of the signal type as i havnt put an osciloscope on it
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1JZ Fuel Pump Relay Wiring
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Sun, 30 January 2005 02:56
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| sideshow wrote on Sat, 29 January 2005 19:51 |
chris yr pump was wired up wrong
it was wired up to the fuel pump voiltage control so at 4000 it would switch from 8v ro battery volts
so in yr car it would have 12v up to 4000 then 0v after 4000
theres i proper way to do it but its not cheap
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Thanks Jim. I would have suspected as much from the dodgy mofo that did the wiring. Why can't you live up here? 
I think I will look into one of these MSD things though as I was just looking at that the other night and thought how silly it was.
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Location:
Casino
Registered:
August 2004
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 31 January 2005 11:13
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I've just been looking into the MSD rpm activated relays I cann't seem to find any that operate at 200rpm.
Sideshow: what wire would i use to trigger the relay?
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 31 January 2005 20:26
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Can't you guys run a circuit open relay?
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Location:
sydney
Registered:
March 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 31 January 2005 22:10
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the soarer 1j and 1uz have a fuel pump ecu
it does not have an earth trigger like the one for circuit opening relay
it has a funny signal and is not streong enough to turn on a relay
all u need is the tacho signal ig- to trigger the rpm switch
if you wait afew weeks im chasing up some better switches that should do the trick
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Location:
Casino
Registered:
August 2004
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Re: 1JZ Fuel Pump Relay Wiring
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Tue, 01 February 2005 10:58
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That would be good, let me know when you have it.
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Location:
Casino
Registered:
August 2004
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Re: 1JZ Fuel Pump Relay Wiring
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Fri, 15 April 2005 10:27
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I have a wild question/sugguestion,
could you use the oil pressure sender to activate the relay? as in VN commodores???? (please accept my apology for using the "C" in this forum.)
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Fri, 15 April 2005 10:30
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You could, but you'd be turning over the motor for a while before oil pressure is up, and the fuel pump turns on.
Probably not the best of ideas.
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Location:
Casino
Registered:
August 2004
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Re: 1JZ Fuel Pump Relay Wiring
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Fri, 15 April 2005 10:36
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Thanks probably why commodores have some sort of priming circuit,i.e turn on ignition, fuel pump runs for a few seconds and shuts of, then possibly the oil pressure trigger might work.
I'm not sure how it a works yet I'll have to do some more research.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Fri, 15 April 2005 10:55
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Look into one of the bosch relays that the JE Camiras run.
When you turn the key to ON, the relay turns the pump on for about 30secs, then switches off until you start the car.
I'm not sure whether its purely Relay controlled, or whether ECU has a hand in it
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Location:
melb
Registered:
June 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Fri, 15 April 2005 12:05
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and that relay used in camiras and vk commos was the main cause of why they would break down on the side of the road back in the 80,s many of those got bridged 2 make the pump run with ignition on . (not recomended)
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Location:
Newcastle, NSW, Australia
Registered:
May 2002
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 18 April 2005 02:52
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You could probably use a standard toyota circuit opening relay (as found in Australian toyotas) and connect it to the oil pressure switch in the same way as it originally connected to the air flow meter ie relay energised when cranking and as soon at it fires oil pressure circuit will keep the relay latched. Inputs would be: power, earth, starter, oil pressure wire, fuel pump.
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Location:
sydney
Registered:
March 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 18 April 2005 05:19
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hey grant u would need a reverse relay cause oil press switch has an earth then looses earth when u get pressure
without the proper feul pump ecu on the soarers its a pain to set up
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Location:
Newcastle, NSW, Australia
Registered:
May 2002
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 18 April 2005 06:02
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Ahh yeah, you're right. Looks like the RPM switch would be the best way to do it then.
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Location:
sydney
Registered:
March 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 18 April 2005 06:17
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what i did i got an lpg rpm switch then wired a relay to it to give a neg trigger
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 1JZ Fuel Pump Relay Wiring
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Tue, 19 April 2005 13:33
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I've said this quite a few times now: if you can't make it work with the ECU signal (although I think there IS a wire on the ECU that switches +5v when the pump should be on, as well as the pulse output for the 'fuel pump ECU'), then why not use an LPG lock off controller? Simple RPM switch, can be had for stuff all, and in a variety of brands. Use it to switch the fuel pump relay. Most of them are rated to about 10 amps, and the solid state ones have a natural voltage drop (transistor), but it's far more than adequate to switch a relay...
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Location:
NZ
Registered:
December 2004
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 02 May 2005 10:22
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You could use a rev/speed meter too cause it has a rpm output switch for turning on relays i think
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Location:
sydney
Registered:
March 2003
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Location:
Casino
Registered:
August 2004
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 02 May 2005 12:29
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Sideshow,
you able to supply the rpm triggers & wiring diagrams, if so price please as I am waiting to get going further with my convertion.
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Location:
sydney
Registered:
March 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Mon, 02 May 2005 22:30
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ok
what fuel pump relay are you running
doin it this way u dont need a circuit opening relay
but if u have one wired up i can still make it all work
i can run wires to the unit and fit a fuel pump relay to it aswell
so all u have to do is connect afew wires
ill give u a diagram
say 50 bucks all up this will include any shippin costs
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Location:
Casino
Registered:
August 2004
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Re: 1JZ Fuel Pump Relay Wiring
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Tue, 03 May 2005 13:00
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Sideshow,
sounds just perfect to me, i haven't done anything so far with the fuel pump wiring etc, at the moment the coomodore standard fuel pump relay and wiring are still in tact.
PM me with your bank account details ,so we can get the ball rolling.
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Location:
sydney
Registered:
March 2003
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Re: 1JZ Fuel Pump Relay Wiring
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Tue, 03 May 2005 22:30
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ok pm me on the weekend with address
as im so flat out this week
i might have time on mon to send it
otherwise ill try by end of next week
too much on and not time to goto post office
but ill have it so this unit will have its own relay so piss the relay u have off
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