My old Coleman lantern pump failed. How to replace?

William, went to Coleman site, looks like you remove screws on bottom of lantern to access and change battery.
Check the attached links to your manual,
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http://r1.coleman.com/Manuals/5327.pdf

Rugged Rechargeable Family Size Lantern

Coleman Rugged Rechargeable Lantern Replacement Parts Flashlights...

Battery Buyer Batterybuyer com

The battery is held in with 2 lugs push them in and remove battery thks

did you turn the knob counterclockwise to unlock the pump

There are several options to buy replacement batteries for a Coleman rechargeable lantern, model 5348-700. I just picked up two new batteries from www.1000bulbs.com for $4.87 each plus shipping. ($20.99 for 2 with shipping!) Do a Google search for: ub645f1 6 volt - 4.5 ah - f1 terminal battery for other options

first thing,maybee you have a smal hole in the burning pocket (if so change the pockets). if not, you migth loose pressure because the o rings of the pump are dryed out. you need to open the pump,lubricate it and replace it. to open the pump, there is a little metal handle to this pump, slowly open it by pulling one side out and the other side of it after. then you should have to unscrew the entire pump out of the gas canister, lubricate everything that is made out of rubber whit vaseline and rescrew it back in the same order you've found it. if this does'nt work, you need to clean the entire conduct system of your lantern, you can do that whit naphta, just soak it in for 2 or 3 hour (do that outside for safety, really) and let it dry, then try again, if its not working, you migth have to clean it manually

If the petrol doesn't come through first check that you have enough in the tank. If the tank is not full enough it won't come through. If it still fails to come through it's likely that the generator is blocked. This is the tube which the mantle sits on and it has a very narrow opening to force the petrol to convert to vapour when it's warm. Try heating it for a while and it may clear it. Otherwise you'll need to buy a new generator.

Note: while the dual fuel lanterns can burn petrol you should be aware that it gives off poisonous fumes, like cars did before they had catalytic converters. The lantern should not be used indoors with petrol. They are safe with coleman fuel. If you live in the USA, Coleman fuel is cheap but if you're in Europe it's much too expensive. Rather than buying a new generator, if you live in Europe, you could buy a parafin burning lantern like the Petromax 500 available from http://www.pelam.de/index.php?cPath=28_31&language=en&gclid=CIOe46DQnqYCFQkf4QodQxz2Zg
and other sites, or you can pick up second hand Optimus lanterns on Ebay. Both burn parafin, though they need to be primed, and provide at least as much light as the Coleman.

It sounds like you are correct. While I don't know much about the new lanterns I have worked a lot on older ones. My first suggestion is the easiest. Try putting some 3 in 1 oil on it. First relieve any pressure in the tank- open the valve then slowly loosen the fill cap- watch out as it will likely spill fuel so do this outside Remove the plunger, there is a black plastic piece that holds it in it will come of either by a push and twist, or by removing a little metal bail across it. (you remove the metal bail (small wire loop) by gently pulling it outward with a small pliers.) then the plunger should come right out look into the hole and you will see a check valve at the bottom, try a bit of oil or wd40 on this, let it sit for a while, it may just be rusted open, and will take some time for the oil to work. Make sure it is working well before you light the lantern. you Do Not want this to fail when the lantern is going. Do this outside and away from any flames. Pump it up and see if it can hold pressure overnight

It's likely that it was left away with fuel in it. This causes gel to form which blocks the fuel getting through. The blockage could be anywhere between the tank and the mantles. The order I would check in are;

1. The feed tube assembly
   
2. The generator
   
3. The Burner
   

It's possible to get these parts from coleman or coleman suppliers. To find which needs replacing you'd need access to another similar lantern and try replacing one at a time. Otherwise it's going to be trial and error or just replace all.

There's a manual which shows the assembly and the order number for parts at http://www.coleman.com/coleman/images/pdf/220f_228F.pdf
I hope this is of some help.

what kind of fuel are you using

Kerosene lanterns require a little more than just lighting the mantles. Go to Coleman's website and find the directions (for free) for KEROSENE lanterns. The generator on the lantern needs to be preheated with alcohol before it will actually light. Make sure lantern is a Kerosene lantern and not a white gas (Coleman fuel) type, there is a difference even though they look similar.