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Garden Tractors Discussion Forum

Re: JD 112 No Fuel to Carb? HH 100 Tecumseh

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05-16-2013 07:49:15

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Remove bowl. Make sure float is moving freely. Remove float and needle. Blow air from the seat side for the needle with the fuel line off and see if anything comes out. Try pushing the seat in(if it is rubber) with the back of a 1/8" drill bit.

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05-16-2013 08:55:00

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 Re: JD 112 No Fuel to Carb? HH 100 Tecumseh in reply to rrobert, 05-16-2013 07:49:15  
I removed the rubber gasket that holds the nowl to the carb before soaking. I removed the bowl and the float before soaking last time and will again next, as well as any other rubber parts.

Gas does flow down the fuel line to the carb so the shut off is on allowing gas to move.

Is there a small, cork like part that sits with the float spring? There seemed to be something under it or it was just a bit of goo.

Seat? Please define?

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joe csuti

05-16-2013 18:55:29

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 Re: JD 112 No Fuel to Carb? HH 100 Tecumseh in reply to BillM2, 05-16-2013 08:55:00  
MNGB is correct about rubber seat at bottom of float needle bore,hole in same either plugged or damaged by carb cleaner.

According to my microfiche cards for eng/spec# you gave carb pn 632424 and correct pn for repair kit is 632347,the HH100 eng used five different pn carbs & there are three different pn kits avail for the five carbs,one kit doesn't work with all carbs,the link NMGB provided is the correct pn kit.

You can buy the needle/seat seperate,but you're probably better off getting kit as you may run into eng surging/hunting for it's speed after you get running,a common problem on tecumseh eng is idle passages in carb body get plugged/gummed up when sitting for a long time causeing surging when running,the only way to cure problem is remove welch plugs(you'll probably have to damage/destroy to remove)run a fine wire thru ALL passages in carb body & blow out with compressed air.

IF/when you replace float needle seat,one side of seat has a ring/ridge,other side flat,ring side of seat goes into needle bore & seals hole at bottom,flat side of seat faces float needle.

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05-16-2013 19:34:25

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 Re: JD 112 No Fuel to Carb? HH 100 Tecumseh in reply to joe csuti, 05-16-2013 18:55:29  
Is there a diagram of this carb somewhere?
I did take the bowl off, let the float hang, and cranked the engine. No gas flowed. I'm soaking the carb overnight to see if that frees up


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joe csuti

05-17-2013 03:19:26

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 Re: JD 112 No Fuel to Carb? HH 100 Tecumseh in reply to BillM2, 05-16-2013 19:34:25  
If the float needle is still connected to tang on float by small clip & drops with float,then the problem is as has been said-hole in float needle seat plugged or seat damaged,if needle disconnected from float then needle stuck in seat due to dirt/gum or the more common cause,needle seat age hardned/distorted & needle sticking in seat,the only cure for this problem is replace needle/seat.

For assembly drawing of carb goto link below & lookup mod/spec# in tecumseh eng parts listing.

IF you have to remove seat from needle bore hole use a long #4 sheetmetal or wood screw & thread into hole in seat & pull seat out of bore,if you do pull out you will need a new seat as seat will be damaged when removing.

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06-10-2013 14:05:11

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 Re: JD 112 No Fuel to Carb? HH 100 Tecumseh in reply to joe csuti, 05-17-2013 03:19:26  
So I cleaned thoroughly and got the engine to run. I may have gotten some fuel line rubber in the carb (I've replaced the old one) because now the engine surges. Or is an adjustment needed? When I engage the mower's belts, it doesn't surge. Any further advice?

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05-16-2013 10:56:55

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 Re: JD 112 No Fuel to Carb? HH 100 Tecumseh in reply to BillM2, 05-16-2013 08:55:00  
There is a very small rubber (doughnut) needle seat if you did not remove it before soaking in carb cleaner it has swollen shut and will not let gas flow. Remove the float bowl and turn the gas on with the float hanging down gas should flow freelly if not the needle seat is blocked. Here's one place to get a carb kit:
This post was edited by MNGB at 11:00:00 05/16/13.

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