Lars
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| posted on 11/4/09 at 02:21 PM |
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Zx12 fuel pump experts needed
Hi all
I have kindly been donated a ZX12 fuel pump.
I have done a bit of a search on the net and found out a few bits and pieces.
It appears to be from a zx12r b2h bike made in 2003.
It should therefore run at 40 psi.
I have been told that this pump has a build in pressure valve (or something) that means you do not have to run a return line, is that correct?
Also I see 3 wires on the pump red/black, yellow/red and black/white.
Does anyone know what they do?
Also does anyone have any other info on zx12 pumps like how much petrol they pump, whether I can run it without the zx12 ecu, what amps it runs
at,etc.
Any other information welcome.
Lars
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mr henderson
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| posted on 11/4/09 at 02:37 PM |
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IIRC the ZX12 doesn't have a return line, and does indeed control the pressure at the pump. Don't know what the actual pressure is set at,
though.
One earth, of course, 12v feed, and I think the other wire goes to the ecu. I don't have wiring diagrams anymore, so I could be wrong
John
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Lars
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| posted on 11/4/09 at 02:43 PM |
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I am still going through past posts and have just found the following relating to an earlier ZX pump:
red/black - level switch warning light
yellow/red - 12V
black/white - earth
I presume that this means that I do not need the zx12 ecu, but I can just hook it up to 12v supply that I already have in the car?
Any idea of what the level switch warning light does? I presume though that as its just a warning light I can just leave it out when wiring up the
pump.
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BenB
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| posted on 11/4/09 at 02:45 PM |
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Presumably when the pump can't get up to pressure it works out that you've run out of fuel. Maybe then it switches off the ignition rather
than letting you run lean?!?!?
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eznfrank
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| posted on 11/4/09 at 02:49 PM |
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I have some clear wiring diagrams if they're any good to you? U2U me if you want it.
Basically the Y/R goes to W/R on the loom, which goes to ECU, fuel pump relay and all four injectors.
BK/W goes to BK/Y on loom and that is the earth which connects just near the rear lights BK/Y line.
R/BK connects to R/G in the loom and is for the fuel reserve switch although this can be removed. I think this ends up at the dash low fuel level
light.
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mr henderson
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| posted on 11/4/09 at 02:51 PM |
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quote:
Originally posted by Lars
I am still going through past posts and have just found the following relating to an earlier ZX pump:
red/black - level switch warning light
yellow/red - 12V
black/white - earth
I presume that this means that I do not need the zx12 ecu, but I can just hook it up to 12v supply that I already have in the car?
Any idea of what the level switch warning light does? I presume though that as its just a warning light I can just leave it out when wiring up the
pump.
Yes, you are right, I remember now, the third wire is for the reserve warning. So it would seem no ecu needed. You will want to wire the 12v through
some knd of relay to cut out when not running, stopped very suddenly, upside-down etc
John
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BenB
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| posted on 11/4/09 at 02:56 PM |
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Yup. Was just looking at a ZX12R (2000) wiring diagram and it shows basically 2 important wires. The third is a bypass for the fuel reserve switch.
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Lars
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| posted on 11/4/09 at 03:00 PM |
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eznfrank
THanks, but as i have made my loom from scratch it won't be much help, but it sounds similar to my loom, with a 12v feed through a relay
(switched by the ECU).
Mr henderson
Yes I have a tip-over valve/switch fitted.
I just really like the idea/simplicity of not having a return line, especially as I am just replacing the prop and really struggleing for space down
the tunnel.
It sounds like the pump should work, just need to find out how much it can flow.
Lars
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rf900rush
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| posted on 11/4/09 at 03:15 PM |
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Hi
Check your U2U
Just about finished wiring my zx12r.
From what I remember the ECU controls a relay that feeds 12v to the fuel pump, injectors, clean air valve and back to the ECU.
Mine is a B3 ECU and seems to get upset if it finds unconnected items.
I had a small tank made to house a GSX1400/GSXR600 bike pump which I hope doubles as a swirlpot.
Martin
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Lars
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| posted on 11/4/09 at 03:23 PM |
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THanks Martin
I am running a MS though, so I wont have any problems with the ZX12 ECU.
However the MS is similar, in that it controls the relay for the pump.
I shall give it a go.
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rf900rush
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| posted on 11/4/09 at 04:18 PM |
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Hi will be interested on how you get on with MS with the ZX12.
As I was running MS-I - Extra on my previous RF900R engine.
Are you running sparks on MS as well, as I only used fuel only on the RF900 as it had a seperate CDI.
Would recommend a Wideband O2 sensor.
I 'm using the JAW kit from LINKY HERE
Other wise something like the LC1.
Both will interface with the MS system.
(EDIT) i think I have mistakenly thought you were using a ZX12R motor rather than just the pump from one
[Edited on 11/4/09 by rf900rush]
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Lars
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| posted on 11/4/09 at 10:59 PM |
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sorry Martin its only the pump, I am runnning a zetec.
Just making a new tank, so looking at reducing the number of fuel pumps, as I did have two, with one feeding a separate swirl pot.
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eddbaz
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| posted on 12/4/09 at 12:10 PM |
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zx12r fuel pumps are model specific in some cases,the a model ones do have a fuel return,while the later models don't return the fuel,hence the
pumps are different.
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matt_gsxr
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| posted on 13/4/09 at 08:33 AM |
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Re flow rate on zx12R pump.
Not sure of figures, but when you look at some of the turbo installs they swap the pump for 300bhp. Standard bike rated at 180bhp.
What power are you aiming for? I'd talk to http://www.bigccracing.com
Matt
p.s. Leighton Buzzard SVA chaps were great (if only the same could be true for my engine)
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Lars
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| posted on 13/4/09 at 10:36 AM |
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I have found out that it should flow about 100l per hour.
I have had a look at the website and they seem to be selling normal bosch pumps for high spec engines.
THis would mean that I would need a return line. (which I quite happily removed yesterday)
I think I will just turn up the power until the pressure starts to drop. (Will have to get a fuel pressure gauge I think)
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