CASE 446

[Ken Mastin`]

My case tractor has a 16 hp Onan. When mowing it shuts down as if the gas was turned off. I did away with the tank filter and installed an inline filter, new hose, new fuel pump parts, cleaned the Carb. Some times it runs half a day some times an hour then shuts down. will run as long as I prime it with gas. Have checked the wiring not sure but think its ok. Any Help appreceiated. Thanks Ken

[professor]

Ken, make sure the tank vent is open on the cap. If it runs after shutting down by itself with priming, it is not an electrical problem. If the cap is OK, pull the line to the pump and see if it is flowing, I would put a fuel pressure gauge at the carb if all else fails to get results ( it can be any kind of gauge that reads 0-15 or so pounds), just put a "T" in the line to the carb. Then look at that gauge when it quits- if it is zero- the problem is in fuel delivery- if it is up the carb is being blocked internally.

Mike

[CogswellCogs]

Ken,
I'm having the same problem on a Case 446. I'll be mowing for about 10 mins and then it die's.
I then blow into gas tank to prime the line up back into fuel filter... then run for another 10 mins. I've been told to watch gas cap air intake, removing screen from elbow filter inside tank, and replace fuel pump... I have a gasket fuel pump, what type is yours?
Last year I had this same problem and what I end up doing was taking off the gas tank and cleaning the inside with BB's and hot {car soap} water about a 1/3 of the way full. What this does is clean the inside of the tank if gas has been sitting for a winter.......It work for awhile but it seemed to come back.

[Ingersoll444]

Ken,

If your still around, sorry I missed this post!! I also moved it out of the big tractor board, into the garden tractor board.

If your still around, welcome to MTF!!!

[Smilinsam]

Ken & Cogswell,

What about vapor lock from heat buildup around the carb or fuel lines?

Is all the heat shielding in place that was original to the tractors?

[Carl]

Ken & Cogswell:
Vapor lock is a possibility. My old MTD used to do that. It all started when the old muffler burnt out. Bought an aftermarket one. MTD muffler had some heat shielding on it.

Finally figured it out when I installed a clear plastic in line filter. Could watch the filter empty out and see the gas boil in it. Moved the gas line to infront of the engine, and problem cured.

[Ingersoll444]

Agean, most of my experance is with the singles, but I have NEVER had a vaporlock on any of my tractors. I guess it could be, but the bigest problem fuel related on these has been the stock fuel pumps. Most guys are replaceing them with the low output electric pumps.

[Smilinsam]

Agean, most of my experance is with the singles, but I have NEVER had a vaporlock on any of my tractors. I guess it could be, but the bigest problem fuel related on these has been the stock fuel pumps. Most guys are replaceing them with the low output electric pumps.

Same here, but then I remembered talking to people who had Simplicity Or ACs that had the Onan twins that had Vapor lock problems when the heat shields were removed for one reason or another and not re-installed.

What is needed is a heat barrier between the manifols/pipes and the Carb/fuel lines. Try and keep the fuel lines away from hot spots and see what happens.

[Diplomat]

This off the subject, on your 446 but does the front and rear implement go up and or down at the same time. Can the lines to the cylinders be switched around on one of them so they are not both up or down.

[Caseguytoo]

This off the subject, on your 446 but does the front and rear implement go up and or down at the same time. Can the lines to the cylinders be switched around on one of them so they are not both up or down.

Don't take this the wrong way. The members here enjoy answering questions and helping people out. However, you've gone about asking your question the wrong way by dragging out some ancient thread that has zero to do with your question. PLEASE.... don't do that. Your question is unique. Start your OWN thread. If you don't know how to start a thread, then go to the top of forum's main page and find out.


The proper way to solve this problem is to install a selector valve that will allow you to choose which cylinder to raise or lower. Going the other route will create problems for you whenever you are in float position. The weight of the raised deck will try and lift the three pt hitch up and vice-versa.

[maxwell1]

ken ,

my 446 has a lot of fuel line shielding that's wrapped around the fuel line in area where points are located.

I can easily see someone eliminating this materail because it makes replacing points and fuel filter more difficult.

check out you fuel line and be sure it fully protected from heat,

note: if your heat sheilds are not in proper order, so much heat will build up it will burn the paint on hood so there is alot of heat in that area.

could cause a vapor lock problem, also be sure you have a vented fuel cap and its not stopped up.

let us know what you find wrong.

[Ken N Tx]

ken ,

my 446 has a lot of fuel line shielding that's wrapped around the fuel line in area where points are located.

I can easily see someone eliminating this materail because it makes replacing points and fuel filter more difficult.

check out you fuel line and be sure it fully protected from heat,

note: if your heat sheilds are not in proper order, so much heat will build up it will burn the paint on hood so there is alot of heat in that area.

could cause a vapor lock problem, also be sure you have a vented fuel cap and its not stopped up.

let us know what you find wrong.

Ken Mastin`has not been back to MTF since he posted in 2005..

[RestMyCase]

You may be loosing the pulse that operates the fuel pump. The condensor may be bad.

[Wizard99]

Ken Mastin`has not been back to MTF since he posted in 2005..

sounds like his loss