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[berserkerboy]

Zirk: The hard start procedure worked although car would not stay running on gas from cold, kept conking out. Maybe it would have done if I had kept trying. However, no problem hard starting once I had warmed the car.

Migmog: 14+ volts at the positive supply of the relay small spade when the car is running in petrol. Either problem with the control of the earthing or just a poor earth? Will check all earthing points I can see.

TB. Regarding checking the earth behind 2,4,6. Is this easily visible or is it plenum off time?

[zirk]

The fact that the car starts on LPG pretty much in my book means you can rule out Ignition, ECU, Crank Sensor, Immobilizer etc and concentrate on the Petrol Fueling System fault.

Also, although not necessarily the issue, as said before its not uncommon for the Petrol Pump to over heat on LPG cars where the petrol Tank has run low, the pumps normally die but can deteriorate before they eventually pack up altogether. Another consideration is is the Tank has been run dry, the pump will pick up any crap in the Tank which could or will block the Fuel Filter, if your getting the correct voltage on the Fuel Pump, these would be my first coarse of action. As asked before a few post back does it piss fuel out at a good rate if you disconnect the fuel feed at the Injector Rail when Prime / Cranking?

[berserkerboy]

I think it's to do with the power supply to the relay, or rather the earthing/negative. The relay is not energising as it should to make the bridge to supply 12v to the pump. Jacking the relay causes the pump to prime and engine runs great on petrol and gas. So I think the pump and filter are fine. There is good voltage to the supply side of the relay (small spade) with engine running. Can only assume the fault is on the other side.

[omega2018]

the purple relay nearest the wing is the injector relay not the fuel pump relay.  the purple relay next to it and nearer the engine is the fuel pump relay.  sounds like your lpg is switching off the injector relay when it shouldn't.

[omega2018]

if you want to test your fuel pump pressure this kit for £8.95  works i have used it on my v6,  screws into the schraeder valve at the back of the engine without much difficulty

www.ebay.co.uk/itm/131955303383

pressure should be 3.7 bar approx mine was 3.6

sounds like it is your injector relay supply/earth not the fuel pump relay/fuel pump though

[berserkerboy]

Thanks for that. I thought the one by the wing was fuel pump. In fact I think it must be? When I jack it the petrol pump starts.

[cam.in.head]

I thought it was the other one too. If you join the 30 to 87 link (big spades) the fuel pump runs ? . Even with other relay removed.?

[Doctor Gollum]

I don't have the wiring diagram in front of me, but they share a couple of common wires but not wired in series iirc...

[omega2018]

both oof and haynes sometimes confuse the two but mostly they say the one most on the passenger side is the injector relay.  on my 2.6 2001 omega it  is, when plugged in the injector circuit makes a noise under the plenum.  suppose that could be the fuel pressure? pulling the wing side relay causes the engine to stall in 2 seconds i would think the fuel pump relay would take longer to drain 3.7bar of fuel

this relay was the cause of my car stalling then failing to start completely.

have a look carefully here http://oldsite.omegaowners.com//forum/YaBB.pl?num=1176542235

[berserkerboy]

Mines the 3.2 engine which isn't shown on that thread. However, I notice there is a diagram for the V6's. One of which gives K44 as the fuel relay. ie the wing side relay.

[omega2018]

yes i said read carefully the other diagram there for the 3.0  says its the injector relay. haynes agrees, except once

[berserkerboy]

Blimey!...Think I've fixed it. But not sure which of the following cured the problem:

Firstly, I cleaned the earth connections below the battery.

Secondly, and I think this was the problem. The purple relay control is straight from the ECU. I unclipped the looms from the ECU and sprayed the contacts with contact cleaner. Put it back together.

Car is now behaving perfectly......I am so happy!!!!

She's booked it for the welding work she needs to pass the MOT, and hopefully that will be that.

Thanks everyone for all your input.

[robson]

got there in the end. It al made  interesting reading Happy to see it solved

[cam.in.head]

excellent glad you found it

[Doctor Gollum]

Hopefully all sorted