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gas sediment bulb on my farmall 400

S

SDE

Well-known Member
A few days ago, I put some gas in the tractor and then it needed to have the choke out to keep it running. I knew that I should have drained the gas out, but I was busy. Yesterday it did not start. I pulled the carb drain plug and only got a bowl worth of gas out of it. I put some HEET in it. But I think that the only way to fix this is to remove, drain, and clean the sediment bulb. I seem to always have a problem getting the bulb to seal properly. I have some cork gasket material. Should I attempt to remove the old gasket and make a new one? I don't think the local car part places will have a replacement gasket.
thank you
SDE
 
Yah, any time I mess with those things they seem to get worse. Sometimes I think a new brass shut off valve and an in-line filter is a better choice. Good luck with the fix ....
 
I have had a heck of a time getting them to seal. Usually pliers on the hand tight nut and a fresh cork gasket works... however the new replacement sediment bowl assemblies seem to be terrible quality- at least the ones I bought. I slightly changed the gas plumbing and put in a inline filter for the ford 2000 because the new sediment bowl was junk. Some battles aren't worth it! Gotta keep the sediment bowl on my 9n since its gravity feed.
 
Pull the line loose at the carb then blow back into the gas tank with compressed air or with your mouth. Have the gas cap off and listen for bubble in the tank as your doing that. Then let it flow out again and see if the flow slows down. As for the gasket I keep extra on hand O'Reilly's part number 398 fuel strainer gasket is what there called.
 
Had some luck with the local OReillys and NAPA stores having stuff like that.

Or maybe TSC, Rural king, etc.

And thy do sell them on this site if you can wait.

Personally never had much luck making my own.

Fred
Gasket and screen
 
I keep a package of the cork gaskets on hands, now I have no trouble with it. You may have stoppage at the tank. For a temporary fix you may force compressed air through the reverse of flow and free the stoppage. cussin' optional but not reccomended
 
just pick up a couple new ones where stated below,, I am amazed at how many have issues on getting a sediment bowl to reseal,, I keep at least 20 gaskets on hand in both rubber and cork,, in my 50 years of working on them I have yet to have a issue getting them to seal as long as I clean off any left over gasket on the shutoff valve and or glass bowl,, only time I ever use pliers on them is on someone else's who have tighten them down so tight it screws up the threads, a note here, if the cork one you install is hard and dried out this works 99% of the time for me I leave the bowl loose a bit and turn on the valve filling the bowl, it will start to leak out as it gets full, tighten the bowl bail nut finger tight making sure the bowl is centered well in the base,,, if it leaks after you tighten it up shut off the gas valve then walk away four a hour or so to let the cork soak up some fuel and soften a bit, then turn on the gas again and it should seal,, this does not work on old mashed out gaskets but it does on the new ones that have gotten hard from sitting,
cnt
 
Unless you can see trash or water in the bowl, chances are that is not the problem.

There is a screen above the bowl, it may be clogged, but unless there is visible trash in the bowl, not likely. If there is water in the bowl, the tank is severely contaminated and will need to be drained and cleaned, best taken off and dumped and rinsed with E85.

There is probably a stand pipe inside the tank, it may have a screen. Chances are it will be clogged. It is the first line of defense, and commonly overlooked. It can be serviced without taking the bowl loose, just screw the entire assembly out of the tank. But be careful, if the tank is rusted thin, it may start the tank leaking or twist the fitting out of the tank.

But before taking any of that apart (unless obviously loaded with trash), take the fuel line off the carburetor, see what kind of flow you get. If the line is good, no kinks, or any added inline filters, and you get a good, full flow, the problem is in the carb, not the tank or sediment trap.

There may be a screen in the inlet fitting of the carb, or the needle/seat is clogged or stuck. Could need a simple cleaning. Usually the bowl will come off without damaging the gasket if careful.
 
Remove the gas line going into the carb to make sure the sediment bowl is the issue, could be rust under the needle in the carb. The sediment bowl cork seals tend to leak until they swell, most times they will seal overtime. Do not over tighten, the holder will wrap.
 
Well what usually happens is when they don't seal on and old gskt people have a tendency to over tighten them and this warps them and alot of times even a new gskt will not stop[ them from leaking . Ya may want to get a new sediment bowl and install it and only lightly tighten them . If they seep then replace the gskt and also always keep the fine screen inplace as this will let the sediment bowl do it's job as anything that can pass thru the screen will pass thru the carb . Noticed that one poster said remove the sediment bowl and us and inline filter Ah this is NOT a good way to go as MOST inline filters are made for systems with a Fuel pump and not gravity flow , also by removing the Bowl you remove the stand pipe that helps keep junk from entering the system . Myself i perfer the Rubber gskt. over the cork and always have several on hand in my truck the rubber ones don't dry out and .get hard as fast as cork
 
Don't always blame your equipment. It's been a few years now, but had our bulk supplier bring out a load of gas as the overhead 300 gallon and the Oliver 1555 were empty. Driver filled the tank and the tractor sitting next to the tank. Tried to start tractor, ran about a minute and died. Checked everything else, had to be fuel. Ran out some of the new "gas" into a pan and tried to light it. Wouldn't burn. Smelled and looked like gas but WOULD NOT burn at all. They came out and drained and refilled the tank, but wouldn't do anything about what was in the tractor so I ended up with 30 gallons of "cleaning solvent".
 
P.S. For any of you in S.E. Michigan the supplier was Co****an out of Brighton MI.
 
Thank you for the replies. My sediment bowl is not completely full. I assume that this means that there is either ice or crap blocking the screen. This is why I felt that the bowl would need to be removed. I will go to O'Reilly's today and get a new gasket. The steel gas line has a short rubber hose on it. I will blow back thru the line and hope that it will clear the obstruction and then drain the tank.
TY
SDE
 
If the sediment bowl is not full that is caused either by the fact the needle valve in the carb is closed or the carb is already full of gas. Two fluids cannot occupy the same place at the same time. Or in other words air in a sediment bowl will act like a fluid so gas cannot enter the sediment bowl unless the carb needs more gas or the needle is stuck in the seat
 
Just want to say this again if you don?t know. The fitting that the line screws into on the carb has a fine screen. Need to pull it out and clean it if you don?t know it is a there. Sorry, if I have told you this before. Good luck.
 
Fuel flow test indicates that the problem is in the carb.. Sure glad that I asked first, instead of creating work for myself that would not have fixed it.
TY
SDE
 
Pull the carb drain plug out and then with the gas on tap on the side of the carb with the handle of a screw driver. If the float is sticking or the needle is sticking that may free it up and the open drain will help flush out any dirt/rust that maybe in the carb
 
i Like to use the standpipe/filter screen available on this site, then just a shut off valve on the tank. If there was a quality filter bowl I would buy one.
cvphoto1995.jpg
 
I could not stop the sediment bowl on my Farmall 460 from leaking. Tried a new neoprene gasket, that didn?t work. Used two cork gaskets and that fixed it!
 
The float is stuck. After I connected the gas line and turned it on, the bowl continued to fill until it overflowed. Now I need to decide if I should try to fix it on the tractor, remove it to fix, or swap carbs with the other 400.
 
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