Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Machinmacone on 12 September 2007, 00:14:23
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Hi All
After just solving my cooling system problems with the help of the forum THE OMEGA has decided to throw me yet another curved ball.
It's a 2.0 Litre estate on an L (1994) A couple of years ago i had it converted to lpg and it's been fine till today it runs fine on gas now, but It won't run on petrol anymore as soon as i switch over to petrol engine just dies. I'm thinking this is probabley pump or relay related i checked fuse and thats fine.
My question is if i remove the fuse and check voltage across it and it's 12v will this eliminate the pump relay as the problem. Any help with this?????
Regards Julian.
:-/ :-/ :-/ :-/ :-/ :-/
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Hi All
After just solving my cooling system problems with the help of the forum THE OMEGA has decided to throw me yet another curved ball.
It's a 2.0 Litre estate on an L (1994) A couple of years ago i had it converted to lpg and it's been fine till today it runs fine on gas now, but It won't run on petrol anymore as soon as i switch over to petrol engine just dies. I'm thinking this is probabley pump or relay related i checked fuse and thats fine.
My question is if i remove the fuse and check voltage across it and it's 12v will this eliminate the pump relay as the problem. Any help with this?????
Regards Julian.
:-/ :-/ :-/ :-/ :-/ :-/
May be worth checking if fuel is making it to engine... ...but also how does lpg since off petrol injectors?
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Hi
Thanks for the response. I believe lpg system fools the ecu into believing injectors are on. Have checked pump and am getting 12v at it but am not getting a sound from it when before when switching on ignition you could here fuel system pressurising (or i think thats what the sound was) Any further help would be much apreciated.
Regards Julian.
:-/ :-/ :-/ :-/ :-/ :-/
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Hi
Thanks for the response. I believe lpg system fools the ecu into believing injectors are on. Have checked pump and am getting 12v at it but am not getting a sound from it when before when switching on ignition you could here fuel system pressurising (or i think thats what the sound was) Any further help would be much apreciated.
Regards Julian.
:-/ :-/ :-/ :-/ :-/ :-/
The engine ecu will fire the injectors, so the lpg ecu disconnects them - that was what I was hinting at, ie check lpg system...
Worth checking that fuel is getting to fuel rail though...
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Have checked pump and am getting 12v at it
Have you done a continuity check between the Pump and Earth to check
that you have a completed circuit. (Between the Brown wire at the pump
plug and Earth with the plug disconnected).
Also do a continuity/ impedance check through the pump assembly itself.
Again by disconnecting the plug at the pump, but checking via the
connections on the pump side. I would expect a higher ohm reading
through this check, due to the pump motor windings, but I don't know
the actual figure. Anyone else know?
If you get odd results, then on of us could always check our own
pump and compare readings.
If all checks ok, then you'll have to start breaking the fuel delivery
pipe run and check that you're actually getting fuel delivery through
the system.
Check if you're getting fuel delivery at the pump first. If ok, check
for fuel delivery at the manifold. If no fuel at the manifold, then
you've got a blockage between the Pump and the manifold.
Probably the filter, at a guess.
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Hi Thanks for your responses have just been out to IT again thinking that if there was pressure in the fuel rail the pump must be working.(Am i correct in this assumption) Well there was pressure their so i tried to start it. It is starting for a second or two then the engine just dies.
Regards Julian.
:-/ :-/ :-/ :-/ :-/ :-/ :-/
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Hi Thanks for your responses have just been out to IT again thinking that if there was pressure in the fuel rail the pump must be working.(Am i correct in this assumption) Well there was pressure their so i tried to start it. It is starting for a second or two then the engine just dies.
Regards Julian.
:-/ :-/ :-/ :-/ :-/ :-/ :-/
Do you get a reasonable flow of fuel at the connector between fuel pipe and fuel rail though? If the filter is blocked, it may be able to pressurise, but not supply fuel quick enough when running...
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Do you get a reasonable flow of fuel at the connector between fuel pipe and fuel rail though?
I don't think you can check it like that. The pump is only energized for a few seconds
to prime the system for a start. The ECU will then open the relay and only reinstate
it to provide pump pressure when it receives a working signal from the Crank Sensor.
You would have to set it all up beforehand, and then get someone else to switch on
the ignition while you watch the flow during a 1 or 2 seconds time window.
But maybe that's what you meant.
The symptom 'Machinmacone' is getting would seem to suggest that he's getting
the initial prime when the ignition is switched on, engine starts for a second or two,
and then dies as the fuel pump is not re-energizing and replenishing fuel pressure.
No idea how LPG works. Is it possible for the engine to start and run when switched
to LPG, when a fault exists that would prevent a start and run on fuel?
Outside of my knowledge base I'm afraid. :(
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Hi
Could it be a faulty injector relay. I have a spare i'll try it in the morning.
regards Julian.
:-/ :-/ :-/ :-/ :-/ :-/
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Do you get a reasonable flow of fuel at the connector between fuel pipe and fuel rail though?
I don't think you can check it like that. The pump is only energized for a few seconds
to prime the system for a start. The ECU will then open the relay and only reinstate
it to provide pump pressure when it receives a working signal from the Crank Sensor.
You would have to set it all up beforehand, and then get someone else to switch on
the ignition while you watch the flow during a 1 or 2 seconds time window.
But maybe that's what you meant.
The symptom 'Machinmacone' is getting would seem to suggest that he's getting
the initial prime when the ignition is switched on, engine starts for a second or two,
and then dies as the fuel pump is not re-energizing and replenishing fuel pressure.
No idea how LPG works. Is it possible for the engine to start and run when switched
to LPG, when a fault exists that would prevent a start and run on fuel?
Outside of my knowledge base I'm afraid. :(
Disconnect it and put end in a jar, switch on ign, it should try to pressurise rail (and fail as not connected), so you should see a flow from pipe to jar ;)
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Hi All
What a day first of all I changed pump relay, still the same. Then I changed injector relay still no joy. Had a think about it decided to start from beginning did what I was told took pipe from injector rail, on with ignition guess what? no fuel or should i say very little fuel. Pump had it I thought then I don,t know why (Petrol gauge showing over a quarter full and always been accurate in past.) I put a gallon of fuel in re conected pipe and guess what car started second attempt. Took it for a run 20 mile or so no probs at all on petrol or gas. Is now starting first attempt as it allways did.
Only thing is i'm unsure now is this an intermittent fault, pump stuck, or sticking or is petrol gauge now reading wrong and is there any way to tell????
Regards Julian.
;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
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Result on getting the car started! :y
Sometimes the sender unit tells lies and unsure of whether Tech2 can resolve any issues with guage reading wrongly. Perhaps TheBoy or M_DTM can confirm?
Meantime, just keep the fuel level up..... ;)