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problems with lpg

 
 
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big_patrol
Mud Obsessed


Joined: 10 Sep 2006
Odometer: 2620
Location: Rossendale


1998 Nissan patrol

PostPosted: Mon Mar 17, 2008 9:03 pm    Post subject: problems with lpg Reply with quote

As above really i am struggling with my lpg nissan patrol its runs fine but has no power and constantly backfires on the over run. Also i can never get more than 30 litres in my 80 litre tank and the guage never reads anything but empty.

Cheers

Danny

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Rossko
Articulating


Joined: 23 Jan 2007
Odometer: 757




PostPosted: Tue Mar 18, 2008 2:51 am    Post subject: Reply with quote

I would guess it's a mixer-type (singlepoint) system of some kind and that it's never been serviced. You could consider taking it to an autogas fitter for a once over, the right diagnostic tools (exhaust analyser etc) take days off diagnosis time.

Before you do that, it is well worth doing the 'regular' service items. Choked or missing air filters affect gas more than petrol. Scabby ignition leads or coil boots, and worn sparkplugs affect gas more than petrol.

The tank issues may or may not be completely unrelated to running issues. Nothing's happened like the tank being rotated in its mountings, or pipes underneath getting squashed or bent?

cheers, Ross K

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big_patrol
Mud Obsessed


Joined: 10 Sep 2006
Odometer: 2620
Location: Rossendale


1998 Nissan patrol

PostPosted: Tue Mar 18, 2008 2:59 am    Post subject: Reply with quote

yes it is a mixer type and i havent serviced it but i have only had it 4 months. I have put a new air filter in. I have new plugs so i will get them in asap. I have moved the tank but i was advised to have the pressure gage at 45 deg from vertical but it made no difference. The amount of gas i could get in has always been poor but when i bought the car it ran much sweeter on gas. It seems to improve if I'm on the motorway at a constant speed on the flat the performance increases. If I'm round town it gets worse more back fires etc and a serious lack of power on acceleration.

I will try the above things fingers crossed

Cheers

Danny

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dpcwright
Just got MTs


Joined: 01 Feb 2005
Odometer: 191
Location: CAMBRIDGE



PostPosted: Tue Mar 18, 2008 8:43 am    Post subject: Reply with quote

When I installed my tank it came with a small cross embossed into the steel of the tank. The instructions stated that this cross had to be set on the centre line of the tank as it was mounted. If it is not mounted at this angle the cut off valve, which is operated by a float, will cut the fuel inlet at the moment it senses that the tank is 80% full - which may be well below the actual 80% level.
I suggest you contact the tank supplier to see if there is such a level device on your tank.
With regard to the running problems is suggests to me that the mixture is too weak but it needs setting up properly.
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Nathaniel
Difflock Royalty


Joined: 13 May 2003
Odometer: 17901
Location: North, North Yorkshire


1979 Suzuki LJ

PostPosted: Tue Mar 18, 2008 6:48 pm    Post subject: Reply with quote

Do the engine valve clearances first.
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Nat

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Rossko
Articulating


Joined: 23 Jan 2007
Odometer: 757




PostPosted: Tue Mar 18, 2008 9:34 pm    Post subject: Reply with quote

Tank valving can be designed for use at 0 - 30 - 45 - 60 or 90 degrees! Unless someonce actually read what is stamped on your valves take advice with a pinch of salt. (you'd be looking for marks like 360/30 or the more obvious 45deg) As the tank has been moved you need to consider this as a real possibility.

Incorrect tank setting can lead to -
(a) vapour pick up which will cause serious performance issues/ flatspots/ backfires. Or it may just be that the tank appears to run out earlier than expected.
(b) over- or under-filling, over filling can cause unexpected vapour venting on temperature change.

The valving is also designed to suit tank size (diameter), so if you have any doubts about the original fitting its worth gathering all the markings and make sure of compatibility.

Having said all that, you may have blocked filters, crushed supply pipe, knackered vaporiser, or just in need of a good setting up. And thats just the LPG ... certainly wise to carry on with sparkplugs etc before looking deeper. As to engine valves, yup some jap engines are prone to valve recession after high mileage on LPG so do look to that too - symptoms rough idle, lack of power, backfires.

cheers, Ross K

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