Quote:
Originally Posted by Badpuppy
Not sure what's the point of those. If they ever clog, you still have to pull the valve.
Easy to check for leaky valve - just empty the sediment bowl & see if it fills up again.
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Purpose of filter in the tank valve is stop all the crud, mainly rust and sand from getting into shutoff valve.
For the pencil filter to get clogged the rust must be 1 1/2 or 2 inches deep in bottom of tank. Not very likely! By the time that happens you will notice that there is only 8 gallons in the tank ... the other 2 or 3 gallons will be taken up by the crud in bottom of tank.
Pencil filter also prevents larger pieces of crud from sliding along the bottom of tank where it covers up the opening in the tank shut off which stops flow of gas.
Then chunk of crud will slid away from outlet hole and the carburetor bowl will fill with gas again. Found a marble some kid dropped into tank which rolled around the bottom shutting off gas! THat will drive you crazy.
Finger filter stops marble from covering outlet!
I have been using these filters since 1969 in model A gas tanks ... Believe me they fix more problems than not.
Why cleaning sediment bowl does not address the PROBLEMs IF you do not have Finger filter.
By the time the rust goes through the shut off valve and gets to the sediment bowl, the shut off valve is full of rust and sand and dirt which soon damages the valve's brass parts.
Every time you move the valve more brass is ground off the valve stem and seat.
Usually it gets so bad that you can not turn the valve.
Pencil filter also prevents bits of cork from OLD gas gauge floats from plugging carburetor.
These cork pieces "sort of" float and get into
float bowl and then inside the main and cap jets to plug them up intermittently.
Then under hard acceleration the flow of gas inside the cap Jet and main jet sucks the cork chunk up to top of the jet where hole reduces by 5O% or more this shuts off flow for that jet ... engine dies. Then cork chunk drops out bottom of jet, flows returns and engine runs again. Then flow increases. cork plugs jet again and engine dies again.
If either cap or main jet gets plugged at speed the engine dies immediately just like the key was turned off when the mixture goes to critical lean condition and dies.
The above is ACTUAL experience troubleshooting many carburetors and help from Bill Kenz and Paul Garrigan (Rumble Seat on V8 side.)