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Sticky Float Valves

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Mr Helicop:
I am often getting sticky fuel valves, the petrol poors out the carb but is fairly easy to cure by giving the bowl a tap. Is this a common problem? Carbs were stripped and cleaned a thousand miles a ago. Is it related to modern fuels perhaps they are drier if you know what I mean. Anyone using any aditives in the fuel or using the higher octane variety?

deltarider:

--- Quote from: Mr Helicop on July 09, 2020, 02:08:32 PM ---I am often getting sticky fuel valves, the petrol poors out the carb but is fairly easy to cure by giving the bowl a tap.
--- End quote ---
Hm, this is a bit of a contradiction. Sticky float valves usually cause the float needles to stick up in the valves blocking the fuel supply but... 

--- Quote ---Is it related to modern fuels perhaps they are drier if you know what I mean.
--- End quote ---

... it is certainly also my feeling modern gasolines are less 'lubricous' since lead was phased out. PD carbs on K3 models seem to suffer in particular from this.

--- Quote --- Anyone using any aditives in the fuel or using the higher octane variety?
--- End quote ---
I recommend K3 owners in particular to add just a small 'maintenance dose' of Redex, Seafoam or whatever every tankfill. A small dose of diesel or lamp oil (= kerosene) might do the same.

JezzaPeach:
I use Sta-Bil and before that had used the tiny carb brushes to give the holes a good clean. I also have got into the habit of turning off the tap a few hundred yards before ending a run to try to leave less fuel in the pipes to evaporate and leave a deposit. No proof it helps.

Bryanj:
Yup, just done it on a 1500 wing with noisy lifters

AshimotoK0:

--- Quote from: Bryanj on July 09, 2020, 05:26:00 PM ---Yup, just done it on a 1500 wing with noisy lifters

--- End quote ---

Do you remember C-Film in the early 70's Bryan  ;D

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