450 diese lgas side

WayneIA · Mar 5, 2012

A frequent visitor of yesterday's forums, but not IHC. Helping some one with a 450 diesel. Will not run on gas idle more than a minute unless you loosen the bowl drain plug.Gas will not run out than. Will run "idle" forever that way. Gas tank, sediment boul ,fuel line have all been off and cleaned. Had the carb apart three times. Nothing that can be seen is lugged.Can't find a orfice that you can't look through.. Manifold( has to come off) to remove the carb" has new gaskets, and checked with either, Any body have any ideas as to what we are missing. Thanks for any help.

sflem849 · Mar 5, 2012

No thoughts, but if you cut a wrench in half you don't have to pull the manifold off to get the carb off.

rustred · Mar 5, 2012

have you checked the vent in the fuel cap? is it the proper cap with a vent?

Janicholson · Mar 5, 2012

Gas cap vent is one possibility.
If fuel bowl is removed, will the float move down and if so will the fuel run out? If the plug is going in the carb too far can it block the float?
Just thinking out loud. Jim

WayneIA · Mar 5, 2012

Fuel cap hasn't even been on through all of this but thanks for the reply.

Farmaller · Mar 5, 2012

If it has the vent tube on side of carberator, make sure it is free of dirt, the vent tube runs down between frame and engine

d282 · Mar 5, 2012

Check your butterfly adjustment inside the intake manifold. I worked on a 650 earlier this year with the same symptoms. The switch-over linkage was not closing the intake butterflys all the way. It is a lever the fits into a V. You can look up behind the manifold and see, or pull the manifold off and make sure they are both closing at the same time.

WayneIA · Mar 5, 2012

Thanks for the "thinking". Here is a couple of other things you might "chew" on.. The plug at the bottom of the carb has a kinda of bushing with a radiator style tee handle drain plug at the bottom. Don't think the drain even reaches in to the bowl.There is a plug next to the inlet of the carb that actually seals off a jet in the carb that reaches into the bowl. If that plug is removed it will also continue to run

WayneIA · Mar 5, 2012

Noticed the butterflies we tighly closed with the namifold off but guess we better check this with it on the tractor.I think you might be on to something. Thanks

WayneIA · Mar 5, 2012

It's open but thanks anyway.

d282 · Mar 5, 2012

That is good, but now make sure they are closed in the gas position when bolted on. email me if you need more help.

Janicholson · Mar 5, 2012

Remove the drain (radiator petcock) with the fuel turned on at the tank, the fuel should come out of the hole like gang busters. If none there is something wrong with the fuel delivery. There is a float shutoff mechanism on some of these carbs that prevent fuel from getting into the carb during operation on diesel. If this is not correctly operating, it can shut off all fuel. Jim

sflem849 · Mar 5, 2012

(quoted from post at 18:29:33 03/05/12) If it has the vent tube on side of carberator, make sure it is free of dirt, the vent tube runs down between frame and engine

I have seen them pinched right off, too.

450 diese lgas side

WayneIA

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sflem849

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rustred

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Janicholson

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WayneIA

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Farmaller

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d282

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WayneIA

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WayneIA

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WayneIA

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d282

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sflem849

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