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JD 112 No Fuel to Carb? HH 100 Tecumseh

B

BillM2

New User
Fuel Pump Techumseh HH100?

I've got a JD 112 which ran fine a couple of years back. Now, I'm not getting any fuel to the carb, it seems. The engine cranks and will run a bit on starting fluid. But when I check the carb's bowl, there's no fuel in it. I've cleared the fuel line and soaked the carb in NAPA carb cleaner for a few minutes, like 20, and according to the directions.

Could it be the fuel pump itself, and if so, where is it located. If it is the fuel pump, I'm having one **** of time finding a replacement one. Perhaps a universal one?

The complete details on the engine are: HH100 115255H. Does this engine not have a fuel pump and is gravity fed?

Any suggestions?

Thanks!
 
Check for spark. The coils are hard to find. There are alternatives tho.

Follow the fuel line. Mine screws into the carb intake. It is rectangular(1"x 2 1/2" x 1/2") and gaskets should be available.

If not, I could send you a used fuel pump. I would need to check diagrams to make sure they are the same.

Generally, the fuel pump will be between the carb and gas tank but closer to the engine so it can use the vaccuum from the engine.


If you blew air from the fuel line to the tank, you might have ruffled the gasket inside the fuel pump. Make sure float is moving freely.

I think mostly 10hp up engines use fuel pumps. There is a way to install a fuel pump that runs off of vaccuum if you need to.
 

Thanks! I can locate no fuel pump anywhere on the engine. I was told it might be a gravity fed set-up. The float moves freely. I may again soak the carb but this time overnight and see if that does something.

Not sure if I understand how to add a fuel pump and why one would be needed given it was running without one for years?

Keep the suggestions flowing -- unlike my fuel.

:)
 
If the fuel tank is above the carburetor it should gravity feed the carburetor. Pull off the gas line at the carb and see if any gas will flow from the tank. If it doesn't check the gas tank for blockage. I would've thought you would found an inline fuel filter. Hal
 

That's what's strange. The fuel flows to the carb down the line without a problem -- a nice stream. Maybe a plug just inside the carb where the two connect -- but I've checked that as well.
 
Yah, if it doesn't have a fuel pump, then no need to add one.

Did you remove the rubber seat before you soaked the carb? It might have swollen or could be slipped out of place. Sometimes they will drop and not let fuel thru.

Did you check for an on/off valve on the tank?
 
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.
 

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?
 
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:
http://tewarehouse.com/520-336
 
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.
 

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
Anything.
 
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.
tecumseh
 

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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