Strange LPG issue, cutting out after a good run.

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Strange LPG issue, cutting out after a good run.

Postby The_blue » 22 Jun 2010, 06:03

If i go on a good, fast run for a length of time (5mins plus) then pull up at a junction the van stalls or has no power for 1-2 seconds. after that it's fine. If i'm cruising around town it never does it.

Has anyone got any ideas? It must be starved of fuel or flooded i recon. But which and what to do?
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Re: Strange LPG issue, cutting out after a good run.

Postby dugcati » 23 Jun 2010, 19:47

vapouriser freezing up? Steve the gas god will be along soon enough to lay words of wisdom :ok 8)
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Re: Strange LPG issue, cutting out after a good run.

Postby steve8090 » 23 Jun 2010, 19:54

Yes could be vaporiser freezing, who's system is it, usual cause of this symptom is too much gas in the cylinders, power valve too far open or rich mixture, engine cannot breath properly, suggest you take it back to the installer to check out. If its a new system and you are still running it in ie you've done less than a thousand miles then expect this sort of thing, too many peeps expect these systems to run perfect from the word go, they don't, they have to settle and will need adjusting after 6-800 miles then it may need another tweek after that to get it perfect, a lot also miss out the annual service, more fool them, the system will run quite happily until it clogs up or something fails due to contamination.
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Re: Strange LPG issue, cutting out after a good run.

Postby The_blue » 24 Jun 2010, 05:46

Thanks guys! I'm very new to the LPG game.


Unknown fit on a new to me van. :(

The vaporiser has a hot water feed, I've just replaced the pipe as it was peeing out. Shouldn't that stop the freeze?

What CO should i be aiming for at idle and high idle? I've got an old analyzer. I'll stick it on and come back with the readings as it stands.

It's a 1980, 2 litre 4 pot LT35 if that matters.

I'll grab a couple of photos of the setup. tonight :)
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Re: Strange LPG issue, cutting out after a good run.

Postby The_blue » 24 Jun 2010, 20:40

The unit was way over fueling.

the CO was off the chart on high revs, idle was 5%. Ended up turning the power valve down about 1 1/2 turns to get 3.5% high revs and 2.5 idle.

runs fine now and no cutting out.

vaporiser is toasty hot :)
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Re: Strange LPG issue, cutting out after a good run.

Postby The_blue » 01 Jul 2010, 16:59

Finally remembered the pictures!


If you could shed any light on the make etc it would be appreciated :)

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