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Carburetor Doesn't Pump

Old 09-29-2022, 08:01 PM
  #1  
giantscalercguy
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Default Carburetor Doesn't Pump

Help out there. Just acquired an older Fuji Bt-50E IS, which I've never even seen, but looks brand new.
It was definitely put away with fuel in the carburetor years ago. I can't get the carburetor to pump.
Shooting gas directly into the carburetor brings it to life for a brief moment then dies. Bubbles in the fuel line don't move. Definitely running out of gas.
I have installed all new gaskets and diaphragms, removed and replaced the Walsh plug. Cleaned, though out with Berryman B12, blowing through every orifice I can find and still, no pumping.
Any and all help would be greatly appreciated!
Dean
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Old 09-30-2022, 05:30 AM
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Tony Hallo
 
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Just a few thoughts;
Is the pulse port on the face of the carb open? The gasket may need reversed.
is the diaphragm and gasket installed correctly? Gasket first then the diaphragm.
Check the inlet valve. Is it stuck or the diaphragm may not be engaged into the metering lever.
There are several pump diaphragms provided in the kit, make sure you have the correct one.
If all this is good I would take the diaphragm cover off and open the inlet valve and check for fuel, once the air is gone I would suspect it will work.
Old 09-30-2022, 12:59 PM
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giantscalercguy
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Thanks Tony for the great suggestions.
When you say remove the diaphragm and wait for gas, I take it as the metering side? Maybe remove the metering valve and crank? I spoke with Aeroscott today and he mentioned checking the insulator block for cracks, which I have not even removed yet.
Question :
I've read suggestions of taking the carburetor off and (soaking) part of it? Curious if you might have any regards to that?
I've been messing with these engines for 25 years. I feel like there's a trick out there that l'm missing!
Old 10-01-2022, 07:01 AM
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Fuji 50's use a line from the crankcase to the carb for diaphragm pressure. Make sure the line is there and does not have an air leak in it. check a picture of the fuji 50ei and you will see what I mean.
Larry
Old 10-02-2022, 04:19 AM
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Tony Hallo
 
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Yes, remove the diaphragm cover, press the lever down and rock the engine back and forth over compression. This will confirm that the pump is working and vent the air trapped between the pump outlet and the inlet valve. If you get fuel the problem is on the diaphragm side, no fuel problem is on the pump side, pump gasket, pulse port, bad fuel tube, etc.

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