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1970 - 444 gas IHC - No Start

R

rlm2139

New User
Rebuilt starter & Zenith 12566 carburetor. Replaced battery. Removed & flushed gas tank/lines numerous times. Repaired bad wiring from starter terminal to coil. Gas pours out vent hole of carburetor most of the time when trying to start. Have thought all along carb was flooding, but now believe gas is not being picked up (starving for gas). On occassion tractor will start. More often than not it will not. Pulled it to start and backfired twice (through exhaust, I think) then started & ran good for 3-4 hours until I turned off gas and allowed it to stop. There seems to be so many variables as to the problem. Can anyone give a definitive answer to problem? I"m convinced it has got to be something very simple that I"ve not stumbled across. Many thanks!
 
You may have a vacuum leak, make sure the intake manifold is tight & the carburetor. Hold your hand over the throat of the carburetor and see if there's good suction on your hand. You may need a helper to try & start the engine. If you have a distributor you need to be sure you're getting battery voltage to the coil with the points open. That's on both small terminals.
Use a volt meter or a test lite. Hal
 
Hal,

Thanks for your prompt reply. Had snow today & cold. May be a day or two before I get back to tractor repair as it's outside in the weather. Please excuse my ignorance, but I need to verify some things with you. I'm quite sure the carb is tight. However I'll double check along with checking manifold. Would there be any other sources of vacuum leaks such as hoses, etc.? When you speak of the carb throat, I assume you mean for me to remove the hose from the air filter. The small terminals would be on the coil? Just one final question. Any idea on why gas pours out the bottom vent hole in carb.? Thanks again. I'll let you know how I make out.
 
Remove that hose and then hold your hand over the throat of the carb. Have someone else to try to start the engine. Have the ignition switch in the on postition. You don't need to use the choke as this should choke the engine. If you don't have much suction. I would do a compression test and write down the readings on each cylinder. Hal
 
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