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Location:
brisbane
Registered:
December 2004
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Location:
Sydney
Registered:
February 2003
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Re: fuel pressure 3sgte
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Mon, 14 March 2005 07:17
 
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i wouldnt wire it to the on wire.
think of what will happen if you have a crash.
20psi doesnt sound particularly high at all. its specific to every car, but for instance sotck pressure on my car is 36psi without vacuum.
the circuit opening relay is not wired up.
so the starter circuit keeps the pump running, but once it starts there is nothing to take over and keep the cicuit closed.
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Location:
On your mum!
Registered:
May 2002
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Re: fuel pressure 3sgte
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Mon, 14 March 2005 07:31
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If you have it wired into accessories then it will turn off when you hit the crank.
I think this because the radio and stuff usually turns off when you're cranking the engine - this will leave you with no fuel pressure when is tries to start.
Athough looking at what STR8 2.8 says makes sense. When you say that you are wired to accessories do you mean the relay or have you hard wired the pump?
Another thing - what is wrong with following the directions on the EMS wiring diagram?
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Location:
Melb, Victoria
Registered:
April 2004
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Re: fuel pressure 3sgte
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Mon, 14 March 2005 07:36
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Yep, the "acc" wire is not a true constant. for testing purposes wire it to the ign.
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Location:
brisbane
Registered:
December 2004
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Re: fuel pressure 3sgte
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Mon, 14 March 2005 07:47
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yer i just wired it to constant wire just to check.. and the same thing happened... so dont know lol
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Location:
brisbane
Registered:
December 2004
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Re: fuel pressure 3sgte
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Mon, 14 March 2005 07:48
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yer i guess the smart option is to wire it into the ecu.. not hard... but anyone got any ideas why it wont keep running.. it is like ruff if u try rev it.. it will idle good for a sec then if you try to give it a few mroe revs it will go up but roughly
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 05:55
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anyone?
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Location:
Wollongong
Registered:
November 2004
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 07:46
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yer it is tunebale it is the new ems.... and it is already tuned for my engine as i had the whole setup in another car... and ive tried 30 and 35psi etc.. but i can only see 2 things but im not sure so im asking 1... flooding the engine from runnin the pump all the time... and 2 one of my silicone intercooler joins has a big slit in it would that make it stall my m8 seems to think so but im not sure? gunna buy another one tomoro but be nice just to get some feed back
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Location:
brisbane
Registered:
December 2004
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 07:49
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and it was running a standard fuel pressure regulator with the old setup so it hasnt been run with the diff pump or regulator that is prboly the problem ?
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: car wont keep runnin
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Tue, 15 March 2005 07:52
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what does the new regulator regulate to? sure it's an EFi one?
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 07:53
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yer it is it goes to 140psi
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Location:
Wollongong
Registered:
November 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 07:53
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The GT4 pump could be shaged...
But if you have a pressure guage on it, then it should be fine...
Set the fuel pressure to what the pressure USED to be on the old car...
You can't really flood an EFI engine, unless you get dodgy spark, or have too long of an injecter time...
I'd pull the plugs out and check their condition... They sound like they are fouled...
Major thing I can think, is spark really...
If you can get the new GT4 pump, to run at the same pressure as the Walbro, things should be fine their...
The slit in the piping...
After the AFM or MAP sensor? If so... That is your culprit... Fix it right now...
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 07:54
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the map sensor is in the ecu. and the vac hose comes off the inlet manifold and through the firewall so that shouldnt be the problem.. the thing is i dont know wat fuel pressure the old regulator used to run at as it was standard and they dont ahve guages etc
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 07:56
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and the time that it does run it dumps alot of fuel out the ass end??? does that help narrow thigns down?
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 07:57
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im no expert but how can it be spark wen it fires and runs for like 5 seconds then dies ???
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Location:
Wollongong
Registered:
November 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 08:00
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The car can run for a short time with dodgy spark plugs because they ahve enough to fire, and tehn get wet and stop...
How long does ti take to start the car (cranking time)?
What happens when you try and restart the car straight away...
If it is dumping HEAPS of fuel out the exhaust... Lower the fuel pressure off heaps, and check your injectors...
One or more of them could be jammed open...
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 08:08
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starts after a few cranks but if u stop it then try again straight away it wont start... yer ill check sparkplugs tomoro ill leave injectors til last i dont know alot about the injectors so i dont wanna stuff nething lol
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Location:
Rocklea qld
Registered:
February 2003
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Re: car wont keep runnin
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Tue, 15 March 2005 08:15
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if the fuel ruunign at 20 psi or this what u have it set to??? are u sure u put a high pressure pump in and not jus a low pressure lift pump or something along those lines???
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 08:19
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nah d00d it is a gt4 pump.. and the regulator guage shows up 20psi or 30 or 40psi watever i set it to it all stalls... just thought it might be to hi... but theres a million other little things it could be just tryin to find out wat some of those could be from other people.. it oculd be wet sparkplugs etc etc , my map sensor could be rewtd but i dont see how... i know my leads r still good, fuel pressure could be a problem as i dont know wat to set it at but if its out by a few psi you wouldnt think that would matter...
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 08:28
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is there a possibility that somehow there has to be some sought of wiring done to the fuel pump circuit.. as it is running off the standard ecu. i just rang my mechanic he thinks it ownt start cauz he wired a fuel pump circuit into the standard harness but not the engine loom .. anyone know where that would be. or if that is even a true comment or is he just talking shit for money lol
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Location:
On your mum!
Registered:
May 2002
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Location:
Wollongong
Registered:
November 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 08:40
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It sounds like over fuelling actually...
Lots of fuel/black smoke out of the exhaust, coughing and farting when trying to raise revs etc...
Sounds like a recent tune we did on a car, when we first got it running (installed a new ECU in it, didn't know the PW to get it to run on) we had around 2.5times the amount of fuel needed...
It coughed, farted, and wouldn't rev up...
I'd set the fuel reg to around 30... And try knock a bit of fuel out of the map at idling pressure...
That is of course if you know what you are doing
Where abouts do you live?
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Location:
brisbane
Registered:
December 2004
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Location:
Wollongong
Registered:
November 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 09:50
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Do the injector check thing (rap) as someone said before...
I don't know what that is exactly though...
If you still have problems, and you are getting black smoke/what seems like raw fuel running out the exhaust, get your laptop, make a backup of the CURRENT tune, and then go in and knock some fuel out at around the idle pressure (when the car is running, it should have a moving thing that selects the current point that is being used by the ECU...
Set your fuel pressure at 35PSi whilst doing this...
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Location:
brisbane
Registered:
December 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 09:53
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haha yer one problem i need to buy the dongle but yer im in no hurry to get it on road .. but it would be nice to know that the engine side of things is out of the way but thanks for ur help im sure one of the suggestd problems will be the actual problem thanks..
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Location:
Wollongong
Registered:
November 2004
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Re: car wont keep runnin
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Tue, 15 March 2005 10:09
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dongle?
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Location:
Rocklea qld
Registered:
February 2003
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Re: car wont keep runnin
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Tue, 15 March 2005 10:48
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did u take the engine from one car and put it in another??? didnt forget a vacuum line somewhere did you???
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Location:
On your mum!
Registered:
May 2002
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Re: car wont keep runnin
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Tue, 15 March 2005 12:43
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we encountered a problem like this once before - it turned out to be the return line to the fuel tank was blocked. Please check this (it drove a mate and I mad).
I think that by trying to vary the fuel pressure between 20 and 40 psi would have answered the overfuelling issue (unless I am missing something).
The injector rap (tapping the steel body of the injector) is only relevant if the engine has been sitting for ages.
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Location:
brisbane
Registered:
December 2004
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