roadrunner
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| posted on 22/6/20 at 01:09 PM |
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Zx10r starting issues
Been struggling to get the zx10 started.
Have a spark and decent fuel pressure but the fuel isn't getting through. Can't smell it from the inlet.
Possible causes are, I haven't done anything with the clutch wire (red/green) should I earth this.
I also have 2 faults showing on the clock that could be related. 25 and 34 codes.
25 is a fault with the gear position switch, but the clocks show a neutral position.
34 is a fault with the butterfly valve from the exhaust. Obviously I don't have one so not connected. I've read on the ZX forum that this
might cause a fault with the gear position switch.
What have others done with the butterfly valve.
Regards
Brad
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bigrich
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| posted on 22/6/20 at 02:51 PM |
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Brad, when you ignition on does the pump prime or run for a few seconds then stop?
I left the servo motor connected with no cables and mounted it under the scuttle though you can buy an eliminator that plugs in place of the motor.
.JPG)
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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bigrich
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| posted on 22/6/20 at 02:53 PM |
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Brad, when you ignition on does the pump prime or run for a few seconds then stop? What pressure are you getting?
I left the servo motor connected with no cables and mounted it under the scuttle though you can buy an eliminator that plugs in place of the motor.
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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roadrunner
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| posted on 22/6/20 at 03:03 PM |
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Hi Rich.
Heard you the first time. Sorry, couldn't resist.
Yes, pump primes then stops. It's a new injection pump.
What does this servo eliminator do.
Thanks
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bigrich
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| posted on 22/6/20 at 03:15 PM |
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The eliminator just fools the ECU to think it has a servo fitted so gets rid of the fi lamp. What fuel pressure do you have? Believe from memory
it's 42psi. Also what have you done with the tip over switch?
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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roadrunner
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| posted on 22/6/20 at 05:38 PM |
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The pump is rated at 8.5bar max. The tip over switch is mounted to the scuttle in the correct direction. I thought if the worst happens it will kill
the engine.
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adithorp
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| posted on 22/6/20 at 06:00 PM |
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I assume it's cranking? Daft one but have you got the fuel feed and return lines the right way around?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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roadrunner
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| posted on 22/6/20 at 06:35 PM |
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Cranking fine.
There is no fuel return.
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adithorp
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| posted on 22/6/20 at 06:59 PM |
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quote:
Originally posted by roadrunner
Cranking fine.
There is no fuel return.
Ah. As I said elsewhere, not that familiar with zx10.
Would it crank if it was a clutch or neutral issue?
Have you checked there's fuel coming up to the motor with the pipe off?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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bigrich
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| posted on 22/6/20 at 07:38 PM |
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I guess you have an external pump instead of the in tank bike type. What pressure regulator are you using? Have you just run a pump direct? . Just
trying to get an idea of your fuel system
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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roadrunner
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| posted on 22/6/20 at 07:52 PM |
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Defo got fuel upto the engine and I've fitted an in line pump direct without a regulator.
Was going to earth the clutch switch tomorrow to see if that helps.
[Edited on 22/6/20 by roadrunner]
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adithorp
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| posted on 22/6/20 at 08:13 PM |
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Doesn't the single line system have s regulator built into the in-tank pump?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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bigrich
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| posted on 22/6/20 at 10:10 PM |
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You must fit a regulator . Direct pressure from the pump is far too high. This may cause the injectors to jam or if it does start the fueling will be
very rich all the time. If you say the pump is 8.5 bar rated it's trying to push 120 psi or so into the fuel rail. I'm surprised
it's not leaking on the joints etc.
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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bigrich
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| posted on 22/6/20 at 10:13 PM |
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quote:
Originally posted by adithorp
Doesn't the single line system have s regulator built into the in-tank pump? [/quote
Spot on. 😁
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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roadrunner
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| posted on 23/6/20 at 05:29 AM |
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OK. So which one do I need.
Done a quick search and there are so many options.
Brad
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adithorp
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| posted on 23/6/20 at 12:16 PM |
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Can't say what you need specifically (never had to do it) but a couple of thoughts...
You could modify the tank to take the original pump. Think I've read where that's been done but maybe not the easiest answer.
Otherwise you need to put a pressure regulator on it. Which one I don't know but get a good one and not a cheap copy from eBay/china/etc;
I've heard of people having issues with them.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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roadrunner
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| posted on 23/6/20 at 12:19 PM |
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quote:
Originally posted by adithorp
Can't say what you need specifically (never had to do it) but a couple of thoughts...
You could modify the tank to take the original pump. Think I've read where that's been done but maybe not the easiest answer.
Otherwise you need to put a pressure regulator on it. Which one I don't know but get a good one and not a cheap copy from eBay/china/etc;
I've heard of people having issues with them.
Thanks.
The only problem I have with fitting a ZX10R pump is that my tank is plastic and I believe they fit from the bottom.
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JimSpencer
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| posted on 24/6/20 at 06:56 AM |
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Hi
The car pictured in my avatar runs a ZX10R, alloy tank, external pump and regulator, down to the 3 bar? (IIRCetc)
So your tank and Pump will, probably, be fine - just need to know the output pressure of the pump and get a regulator to suit.
If you're looking for brands then ones I've used and would be happy to use again (but there will be lots of others):-
Malpassi or Sytec, both do adjustable injection regulators with gauges, so you can fit and adjust yourself.
HTH
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roadrunner
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| posted on 24/6/20 at 07:48 AM |
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I'm using a sytec pump.
Max pressure of 8.5 Bar.
Max flow rate 264 ltr/hrs.
Flow rate at 3 bar 201 ltr/hrs. (44psi)
Flow rate @ 5 bar 165 ltr/hr. (73psi)
Brad
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JimSpencer
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| posted on 24/6/20 at 09:38 AM |
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Hi
Ok so way over pressure, but a simple fix, get a sytec pressure regulator to drop that down to 3 bar and you're sorted.
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roadrunner
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| posted on 24/6/20 at 09:47 AM |
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Thanks Jim, Adi and Rich.
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roadrunner
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| posted on 25/6/20 at 12:12 AM |
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One last question.
Would it be OK to mount the regulator at the back of the car so the return is shorter or is it best practice to mount in the engine bay.
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JimSpencer
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| posted on 25/6/20 at 06:46 AM |
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Hi
As I understand it (Adi and Rich will probably have more relevant direct experience here) it's technically correct to have the regulator near to
the fuel rail to ensure even fuel pressure when using it 'enthusiastically'!
On my installation it's actually adjacent to the pump, which is right next to the fuel tank, but that's immediately behind me in the tub
and the engine bolts to the back of that, so the fuel line is only half a meter long or so!
If I was running one in a seven from a rear mounted tank then I'd mount the regulator in the engine bay and have a long return myself - but
I've no experience of doing this to confirm it's required.
Sorry this doesn't really help!
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bigrich
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| posted on 25/6/20 at 07:29 AM |
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Modern vehicles regulate in the tank so I see no issue keeping the return short and fitting the regulator on a T piece just after the pump.
I would use a metal T piece over plastic just because of the high pressures involved
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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adithorp
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| posted on 25/6/20 at 08:05 AM |
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All things being equal fitting near the tank is the simpler solution. Only issue with that I can see is if the pipe to the front is small diameter,
then with lower pressure you might not get the flow rate required.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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