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630 Auto Shutoff Fuel Flow Mystery

J

jkmdg84

Member
Ive been having a fuel flow issue out of my auto fuel shutoff on my 630. It seems that the tighter the seal against the gasket, the more it restricts the flow of fuel when I try to use the prime knob. I cannot find a happy medium of getting a good fuel flow and getting the sediment bowl tight enough so it doesn't leak fuel when full. So basically when I have everything tightened up, the tractor is starved for gas.

I relined the gas tank and rebuilt the shutoff earlier this year and recently started having problems. The rebuilt parts all came from Deere. Checked and found no crud in the gas tank or shutoff when I started having problems. Basically the looser the sediment bowl is to the shutoff, the better flow of fuel. I am trying to figure out what would be causing this?
 
Loosen the plug in the bottom of the carb and let the fuel run thur,you may have a air lock.I had a 420 that the fuel would not run thru when you took the bowel off and cleaned until you bled it out
 
Hold down the little primer button when tightening the diaphragm screws.

I've had trouble with gas eating up the seals and then getting a tank full of gas in the crank case, I went to a common sediment bowl with a manual shut off,not original but it's sure nice!
 
You do know that gas will only flow from the tank into the glass bowl and hence into the carb when the carb float allows it to ? Sounds like your float and needle/seat are working. HTH
 
My JD 520 was acting-up and found that a stuck float/ float valve....no gas getting into Carb. With the drain plug removed from the CARB. there was no gas in the CARB. There was however gas getting to the CARB. as gasoline was flowing from the auto. shut off until the AUTO shut off was drained. The neighbours 620 had a problem so I used the below rebuild PROCEDURE from the "MACHINERY MAN"
You need to put all the diaphragms in place and really slightly tighten all the screws...then push the plunger down... after loosing the top locking screw...with this held down then evenly tighten all the screws...this relaxes the diaphragm and keeps it from stretching too much and tearing up after installation...most people don't put these in correctly ....same principal we used in putting diaphragms in the fuel pumps...there's a technique
Procedure was originally posted by the MACHINERY MAN
Thanks MACHINERY MAN
Bob.......
 
730lp has the answer to your problem. Sometimes I will leave the sediment bowl loose to let the air escape. When it's full I tighten it up.
 
Being around 100's of these & the owner
currently of 7 with auto shut offs I have
never experience your issue's after a repair
or a rebuild?? But I'm curious does it act
the same way the fuel cap off?
 
Yeah I have experimented with the cap on, cap off, and cap loose. Doesnt seem to influence the results. Most times the tractor will run for a while before it starts to starve for fuel and eventually dies.
 

Then my test would result to a alternet
fuel supply for a test. With the fuel line
from sediment bowl to carb disconnected
& a constant fuel supply connected to the carb.
Start up the engine & watch the fuel supply
from sediment bowl. If it slows down then
somewhere between where it's running into a
catch can & tank outlet it's restricted.
If the engine still dies after awhile the
problem is carb, fuel inlet, needle & seat
float binding or stuck. I assume the engine has
enough oil pressure to operate the diaphrams &
the auto shut off is assemble correctly....
 
Just remember if you start in freezing temps the oil pump could freeze and the square drive coupler can break and you will be running with no oil pressure. Always look at the oil pressure year around after you start up .
 
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