Gas runs like poo off a trowel

**MacMan** · 30th September 2005, 07:07 AM

I filled the Disco with LPG at a Safeway Discount in the morning yesterday and made it about 300m before it started to cough, fart, splutter and backfire out both holes to the point that it was not driveable. It has been running perfectly on LPG for the 11K we have had it, including the drive to the servo. It was not quite empty when I filled it, taking 69L when it will take 76L when it has stopped running on LPG. I switched to petrol and limped back to the servo - was nearly out of petrol too! ULP ran fine, but as soon as I switched back to LPG the same cacophony started.

So, my thoughts are:

1) It runs fine on ULP so it is not electrical.

2) It when running like poo off a trowel on LPG, it is not a regular misfire - random pops and farts - so it is not electrical.

3) It was running perfectly until I filled it, so it could be the LPG itself. I mentioned to the servo owners that perhaps they shouldn't be selling LPG until they get it checked out, but their only reply was that I could make a complaint if I wanted to and they won't check the system until they get more complaints. Riiiight!!! Won't be buying fuel there again... BUT, since the fuel is under pressure from the tank, there would have to be something seriously wrong with the gas. I can't imagine that anything NOT flammable would dissolve into LPG and stay suspended.

4) There is no easy way to dump the fuel out of the tank without ending up in the burns unit of the Alfred, so I am kinda stuck!

Any ideas?

**abaddonxi** · 30th September 2005, 09:28 AM

Years ago when I had an F100 on LPG I had the same problem. Turned out it was the fuel line freezing. Solved it with a jug of water. Or wait a while and it unfreezed itself.

May not be your problem, but easy if it is.

hth

Simon

**rangieman** · 30th September 2005, 09:32 AM

yep watch the temp gauge check the water the only reason they freeze is because of lack of coolant [water] sounds possible [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img]

**loanrangie** · 30th September 2005, 11:15 AM

Air lock in the coolant system will cause those symptons, try again at home and check that the converter is getting nice and hot, if it ices up then you will need to bleed it to get the air out.

**MacMan** · 30th September 2005, 01:00 PM

Drove to work this morning and the car ran about 90% until it came to normal operating temperature. Once warm, it started the random miss and backfire again.

Kinda puzzling. Did the same thing when I went to move it as in ran fine when cold. I'll see what it's like tonight on the way home.

So if I understand correctly, the LPG system has some kind of heat exchange fluid circuit?

Cheers, and thanks for the input.

**p38arover** · 30th September 2005, 03:54 PM

Originally posted by MacMan
So if I understand correctly, the LPG system has some kind of heat exchange fluid circuit?

Yes, the lines from the heater circuit are plumbed through the converter where the liquified gas is heated and vapourised.

Ron

**discowhite** · 30th September 2005, 06:01 PM

i know nothing about gas!

now thats out the way, i did have the same symptoms on a gas forklift.
it turned out to be the mixer, somehow making it run rich then lean??

phil.

**Michael2** · 30th September 2005, 11:20 PM

Check that the backfire protection valve. If the rubber flap on the valve is open it will run like that. Also check that none of your aircleaner hoses are loose.

Rovernaut · 1st October 2005, 07:45 AM

May not be the problem, but LPG has a treacle like substance by- product called "heavy ends", after continual use is brown treacle like stuff clogs converters/ mixer diaphrams.
You may find that your converter has a screw in plug underneath, whith the engine warm you can drain this junk out.
I cleaned mine after 150K on mine and was shocked by what I saw.
Also if there is no hot water entering the converter the gas will freeze and not vaporise causing problems

**BigT** · 1st October 2005, 08:28 AM

could also be a loose wire on condenser happened to my brother on his F100 took it to gas place they replaced the mixer to no avail, so cost him $$ he didn't need to spend and only found the loose wire accidently when he bumped it whilst doing something else,it used to back fire and breakdown when you wanted to grunt it. may not be problem but worth a look [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

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