[AT] OT - JD STX38 fuel problems

[Dean VP]

Mike:

Another thought. Is it possible that the float is hanging up in the bowl
because it has been bent accidentally to one side? Or the needle getting
stuck in the seat occasionally? Or the float isn't set quite right to allow
enough needle travel? Maybe due to heat?

Can you get to the hose that runs from the in-line filter to the carburetor?
If you take this connection loose at the carburetor is the flow always good?


This is the demarcation line. If the flow isn't good at the end of the hose
that connects to the carburetor then the problem is further back towards the
in-line filter and/or tank or lines. If the flow is good, then the problem
is in the carburetor. The parts list doesn't show how the hose connects to
the carburetor, but maybe there is some crud at the inlet point, maybe a
partially plugged screen or sticking float or needle valve. All it would
take is a small piece of crud at the needle and seat to cause the symptoms
you are experiencing. 

I keep thinking of a vapor lock but I've not seen that when one has rubber
hoses feeding the gas. 

Since you don't have the solenoid that shuts off the gas and you are not
losing fuel into the carburetor when the tractor is parked, then the needle
must always be shutting off the fuel flow properly. That kind of precludes
the possibility of some crud at the needle to seat interface and it would
flood occasionally too. Unless you are always shutting off the fuel valve
after each usage. 

To me checking the hose inlet to the carburetor will lead you to the
problem.

Dean A. Van Peursem
Snohomish, WA 98290

What people can dream, people can do! George W. Bush

www.deerelegacy.com

http://members.cox.net/classicweb/email.htm




-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dean VP
Sent: Tuesday, May 18, 2004 9:58 AM
To: 'Antique tractor email discussion group'
Subject: RE: [AT] OT - JD STX38 fuel problems

Vaughn:

Seems to me it has everything to do with fuel flow if it is not working
properly. If the wiring is intermittent or the coil in the solenoid has some
windings that short out it may not be opening properly or staying open
properly during run time. It appears to be opened by turning on the switch
and is supposed to stay open until the switch is turned off. If it isn't
opening properly or is intermittent it would explain the symptoms present.
It may start acting up only after running for awhile as it heats up. 

Dean A. Van Peursem
Snohomish, WA 98290

What people can dream, people can do! George W. Bush

www.deerelegacy.com

http://members.cox.net/classicweb/email.htm




-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Vaughn Miller
Sent: Tuesday, May 18, 2004 4:50 AM
To: at at lists.antique-tractor.com
Subject: RE: [AT] OT - JD STX38 fuel problems

The solenoid at the Carburetor bowl shuts off fuel to the main jet to
prevent backfire, and will have nothing to do with the flow into the
carburetor.

Vaughn

>>> deanvp at att.net 5/18/04 1:21:01 AM >>>
<snip>
4.) What does the solenoid do in the carburetor bowl? Does this just let
fuel flow when the switch is on? Doesn't look like a pump. Is this
solenoid
acting up? Wiring loose or corroded? This may be where the problem is. Is
the carburetor bowl clean inside? 
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