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In reply to Post #61
if its low on fuel then there is more air space to pressurise, so there is more pumping needed. if you fill to within a couple of centimetres from the lip it should pump up quite easily. as the fuel level drops it needs more pressure.
even a full stove needs a good pumping prior to lighting. you should pump it until you feel its getting very tight. this is the build up of air pressure inside the stove.
if the flame starts to turn slightly yellow it needs re-pumping to restore the fuel/air mix. 
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In reply to Post #60
hi, when i pump mine up it takes ages of constant pumping to turn the flame all blue.
im guessing that the pump needs fixing? if so where can i get it repaired?
thanks dan
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In reply to Post #59
no need really as you could just soak it in a plastic tube, we only used to do it that way with the exhausts because of their size.
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In reply to Post #58
might not be so easy to get the caustic soda down the genny pipe as it is with an exhaust pipe, though 
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In reply to Post #57
You can get it from any hardwear store or somewhere like B&Q, its dead cheap so you shouldn't be paying over much £2 for a tub.
I used to plug one end up then just pour about 1 cup full of soda into the exhaust and pour in luke warm water because if you use hot water it will shoot water out the pipe or the gas it gives off (you can weld with it) will burn your lungs as it is a little bit toxic  .
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In reply to Post #56
might consider that if none of the previous can bring a genny back from the dead.
how much caustic to how much water? do you have to add the soda to hot water to get it to dissolve?
and where do you get it from?
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In reply to Post #55
thats the one fella , it used to be the best thing going for the bikes.
We just left it over night 
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In reply to Post #54
do you mean;
remove the wire from the genny, then soak in a caustic soda solution, to help break down the carbon deposits?
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In reply to Post #1000
Just as an idea, we always used to used caustic soda to remove carbon from our motorbike exhausts. 2 stroke engines burn alot of oil so you had to clean the exhaust 1-2 times per year and caustic soda always worked and was cheap.
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In reply to Post #51
ok ta its fine the first time i light it burns bright blue flame but if i relite it ten mins later this is when i have issues il take it apart today
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In reply to Post #50
whats it been run on, aspen?
sorry, read your post again! 
maybe your not whacking enough pressure into it. although the aspen is supposed to be cleaner [never used it] it will still need the right fuel/air mix. the redex will de-carbon it, and the full pressure burn/hi heat will clear the soot/coke.
mine burns red hot, the outer ring glows 
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In reply to Post #49
cheers dave even put redex in it when its never been run on petrol since new
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In reply to Post #48
start with emptying all the old fuel into a clear bottle. this allows you to see what ***** has been going through the stove!
add some new fuel [normal unleaded] with a tiny bit of redex in it [5ml to 5 litres]
pump it up to full pressure, and then light. as soon as its burning fully and glowing hot, turn on and off a few times. tap the genny with the back of a large spoon, to help dislodge any carbon in the genny.
turn on and off a few times [rapidly] and see if its now burning cleanly. make sure your using it pumped up to full pressure.
if your still struggling try reading all the previous info.
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In reply to Post #47
im having dire prob with my double burner keeps burning yellow flame and never turns to blue after a while bloody keeps getting everything all black had to resort to jacks gas cooker last week , plus i dont run it on petrol only aspen 4t ?? any ideas
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In reply to Post #1000
Great info. Cheers everyone.
Have a double burner and had issues with a leaking on-off valve as dripping fuel was collecting. Reckoned it was a blocked genny causing a back up of pressure escaping out of the on-off valve - confirmed by a quick phonecall to the Tackle Box (Coleman spares and repair centre).
After stripping down the genny assembly and boiling it in water for 15 minutes then rebuilding it and hey presto...
...ROARING BLUE FLAMES on both hobs. Just like new!
Thanks to this thread I've saved £15-25 on spares + postage charges . 
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Tackle