Sediment Bowl questions and concern

I ve got an issue I want to run by you guys. I have a Jubilee and had many problems in the past with sediment clogging fuel line. (yes I know Im going all the way to the beginning but... never know info may help) I emptied tank and took off and got the sediment and rust out of the tank and reinstalled. at the time they had some aftermarket pepcock on the unit.... I installed it with a proper sediment bowl.

Now even after rebuilding the carb im finding as the tractor sits the carb bowl must leak out to emplty so when I want to use tractor I have to open up the fuel line and fill the carb bowl first so to speak. I notice this takes [u:947febbe74] long time!![/u:947febbe74] I realized the other day that the sediment bowl has 3 ports on it. the Line out to carb and the turn dial switch and a closed off hole with a cap screw installed on it. I opened that to see if it was clogged and if gas was flowing and by opening that I let air in so the gas would flow better. Since then I find that if I keep this not 100% tight to let air in / out of the system gas flows better.

I ordered a fuel line check valve to install to let air in but not gas to leak out of that third "port". is this usual. I had a 8n before this and didnt have an issue with gas flowing properly and sediment bowl was not "messed with" at all to allow gas to flow better. What am I not getting???/ or doing wrong. the other set up did need "air" inlet to allow to gas to flow??

Thank you for any input. I hope I explained this properly.
 
First, check to see how fast it fills with the fuel cap off. Perhaps your vent in the fuel cap is clogged.

You might need to post some pictures. Sounds like you might have a dual fuel sediment bowl (eg start on gas and then switch to kerosene/fuel oil) or a JD style that has and oil
pressure cut off built into the sediment bowl.

Also, my Allis "B" will appear to have some bubbles at the screen and look like its not filling fully, but gas is still getting to the carb and it starts. After it runs, the engine
vibration gets the bubbles clear and it looks "full". Finally, when it runs out of gas it will pull fuel out of the sediment bowl to about half. That shows the engine/carb produces
enough vacuum to draw the fuel into the carb even when its below the outlet of the sediment bulb.
 
Have you tried removing the drain plug in the carb bowl to see if it really is empty?

Try that, see how much flow you have.

If no flow, disconnect the line from the carb, see if there is flow there.

If good flow to the carb, there may be a screen in the carb inlet fitting that is clogged, something blocking the needle valve, the float drop set too high.

If no flow from the line at the carb, there is a problem at the tank valve. I don't know what type tank valve you have, but it shouldn't have a blocked port. I would try to get the correct valve. A good valve will have a screen standing up inside the tank to protect the system from any future rust or anything that may get in the tank.

I doubt a check valve to let air in will work, I would be worried about it failing to seal and dripping gas on a hot engine!
 
as a jubilee owner for 30 years, it sounds like a combination of several problems, first im guessing without a pic, but it sounds like you have the wrong sediment bowl assembly on the tractor, it should be a simple one line out and to the carb, if letting air in by any means helps the situation, you may have a non vented gas cap on the tank, jubilees mush have a vented cap, the carb bowl should fill from empty is less that 10 seconds, so after you solve the fuel flow issue, if you still have slow filling, something is clogged, the part of the sediment bowl that screws into the tank should have a screen on it, that could be full of trash, there is another screen in the proper sediment bowl, and last there should be a screen in the gas line elbow where it screws into the carb than will also get clogged with junk, check this out, and post back, we'll go from there
 
I dont have a vented gas cap on it. I will take pics tonight of the set up. When I take the drain plug from the carb out there is nothing in there. so I know the carb is leaking dry while sitting. funny as there is a little screw I will take a pic of that I cannot get out but always seem to look sorta wet around it and may be leaking from there?! its the size of a needle valve. I took special attention fo the carb bowl float when I took carb apart and rebuilt. and tested it and by blowing into it to does turn on and off ok so Im pretty sure floats and valve working as should. I should maybe try it all with the gas cap off and see if it the gas cap issue... but not Without letting air in I can open the pepcock and it will take like 15min to fill the carb bowl and be able to start it. Thats how I have discovered all this. diagnosing a no start with the darn thing. slowly all this coming to light as I am trying to get her to start up ok. Also many times I once get it to start when the carb bowl runs out...it dies again?! BUT NOW its fine with letting a little air into the system.... but issue there is the cap screw leaks ...and not the engine no less. I will report back with pics of sediment bowl and gas cap. It was the model number called for the NAA model. Granted from tsc but again will get pics and all that for you tonight. hard as I have not been able to do some work I need to do with the gas issues. without letting air in it dies all the time after I use up the gas bowl and have to wait and let more gas flow into bowl. when I discovered the air helped it did just that...used gas in carb bowl..stalled and opened the sed bowl cap screw to see if I got gas flow and she gurgled and bubled and I got gas flowing out well out the bottom of the carb. with that cap screw tight I open bottom of carb bowl and I get no flow!! so I know its a flow issue and a float valve issue. Thank you all for the feedback. I will see if no gas cap helps too!! its an easy fix once I know whats going on!!!
 

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