426e Difficult to Pump

[burnt bacon]

This is a prospective buy. The pump is stubborn in sliding up/down. Took the clip off, removed the pump itself, has a rubber gasket, which seems odd for a stove from '82. Looked down the tube, didn't appear rusty or anything. Maybe the replacement is the wrong fit...? Everything looks decent, the pump just would barely go up and down.

The asking was reasonable, but i went lower, no sale. If I had a clue, would have taken a chance. Welcome any thoughts on it, thanks.

[SteveRetherford]

oil ? but i dont like them rubber cups .

[burnt bacon]

Thanks, was trying to figure out if that was that problem. I know the cup could fail to trap the air, etc., but sticking so bad it won't move seems altogether different.

[Ridge Runner]

I’ve got a couple late-70s/early-80s with a sticky neoprene cup. One is a 426D. I plan to change them out to leather at some point since no amount of oil seems to make them want to slide nicely.

[burnt bacon]

I’ve got a couple late-70s/early-80s with a sticky neoprene cup. One is a 426D. I plan to change them out to leather at some point since no amount of oil seems to make them want to slide nicely.

got it, thanks

[Majicwrench]

The pump shaft also has to slide up and down on the air stem....the shaft with the threads on it. That is often a source of sticky pumping....

[burnt bacon]

The pump shaft also has to slide up and down on the air stem....the shaft with the threads on it. That is often a source of sticky pumping....

Thank you...from the diagram, a square shaped shaft comes up the tube from the check valve. I really think some wrong parts are involved.

[TwoCanoes]

The pump shaft also has to slide up and down on the air stem....the shaft with the threads on it. That is often a source of sticky pumping....

I had a stove with this problem. Swapping in a different pump shaft fixed it.

[burnt bacon]

Well, I passed on this one. But for the pump issue, it was in decent shape. The asking was 30, they wouldn't take my 20...it has since been sold, not sure what they got for it.

Thank you all for the convo...

[adkbill]

In the future do not be surprised at the variety of pump assemblies you will find when you unclip them.
WAAAY too many times I have found AGM pumps in Coleman products.
Not such a big deal to switch out, but always feel a bit deceived.

[burnt bacon]

In the future do not be surprised at the variety of pump assemblies you will find when you unclip them.
WAAAY too many times I have found AGM pumps in Coleman products.
Not such a big deal to switch out, but always feel a bit deceived.

Thanks, this one did appear to be correct, but it was messed up. The opening on the aluminum cap where the pump goes through, appeared to be elongated, as if someone had banged on sideways.