Hello, I stumbled on another problem... I am trying to replace my stock rubber pump cup assembly with a new leather one. However, the kit explains that I must remove the metal plate that sis behind the cup and replace it with this plastic one. It seems as if its soldered on or just extremely tight. How do I get this piece off?! Or... Should I try leaving the original metal one on with the leather. The diameter seems the smallest amount larger than the plastic one does it matter? I did notice that the inside of the tube has a lot of scratch wear along the entire inside where the metal cup must have been sliding across all these years
You can leave the metal plate. The new leather cup will do a better job at protecting the tube walls I think. Those rubber cups tend to have some play in them with age. ATB, Jeff
Ok I left it on and its working good. The only problem that may still exist is that a little bit of fuel spurts into the pump tube when the rod is loosened from the closed position. It seems to happen only when there is a little bit of pressure in the tank and I open it to start pumping (I hear a faint spurting or bubbling sound). This probably explains why it needs to be lubed so often as the fuel is dissolving the oil.
Sounds like the check valve may not be sealing well. With the stove empty, pump it up, and before locking it down keep your tumb over the hole. If the pump rises by itself, you have a leaking check valve. Sometimes a little crud gets in there that just may just free itself with use now that you are using it. But you may try to clean it in place with some solvents -- look around this site. Removing the check valve can be a real job on some of these older Colemans. In the mean time, try to keep the stove level and don't over fill it. That should prevent the fuel from getting into the pump tube. As you noticed, the stove will work as long as you can manually lock down the the pump.
My hiking trip is in less then a week and I already filled the tank about 1/2 way. Hopefully it will come loose by itself. I'll have to carry some olive oil with me I've tried removing the check valve on both of my Peak 1 400A's with a long thick slotted screw driver but didnt get them to budge. Only some stripping. I'd probly have to grind the tip of the screw driver down flat before it holds tight.
Yup itchy is right the check valve is leaking a bit. You can try some WD-40 using the red needle tube to get some right into the check valve. Old fuel will do this to the check valve. You need a wide slotted screw driver to get the check valve out. Canadian tire no doubt has one on sale or a set. My experience has been they are never on sale when you need them though. Keep using the stove this week and before you know it you will be able to use it in your sleep. ATB, Jeff
Looks like it waited till the last night to act up! My hiking trip is tomorrow, early morning, and both my 400A's are down! #1. As I listened to the bubbling sound up close to check if the check valve was still leaking I got a huge squirt of fuel in my ear. Now the fuel sprays with pressure through the pump rod and the chamber tube fills up. It does this as soon as the valve is opened, even after the pressure is released through the gas inlet. Seems to only need a little pressure. I am about 1/3 tank of fuel as well, holding the pump facing upright. The Check valve wont budge with my slotted screwdriver. #2. The other stove will not get to a steady blue flame. Instead, the orange flame grows higher and higher up to a meter high while on the high setting. I tried moving the hi/low pin back and forth like crazy to clean the generator as well with no luck. Does this mean my generator is gunked up and needs blow torching or something? Ive tried taking it off once without luck.
Ah sorry about your luck. I am sorry to hear you got shot in the ear with Coleman fuel. That sounds terrible. I hope you are okay. Well your first stove sounds like the air chamber is leaking allowing fuel to get to the check valve. Which isn't normal. Removing the check valve is the only way to find out really. I have spare 400A tanks. The second stove sounds like it has a worn jet/generator. It needs to be replaced or you can attempt to clean it out. Best Regards, Jeff
