[AT] OT - JD STX38 fuel problems
Dean VP
deanvp at att.net
Thu May 20 17:19:14 PDT 2004
Mike:
Have you performed the tests I suggested to isolate the gas flow problem to
be on the filter side or the carburetor side? It's a simple test that would
lead you to the specific problem w/o doing anything else. After reading some
of the additional posts I would now guess the problem is the NAPA filter.
With what little a JD OEM gas filter costs, I would replace the NAPA filter
with a new OEM JD gas filter - AM107314 - $2.35 at your JD Dealer. Worst
case it doesn't solve the problem but that will help isolate the REAL
problem. Having a spare fuel filter handy is a good thing anyway
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 Mike S Meulenberg
Sent: Thursday, May 20, 2004 4:39 PM
To: at at lists.antique-tractor.com
Subject: Re: [AT] OT - JD STX38 fuel problems
Larry,
I just looked at the owners manual too see if there may be a picture of
the original filter. I did find one, and it does appear to be a lot
smaller in length and diameter. While were on the OT subject, I was
wondering if anyone would know why this mower won't haul my butt up a
small hill in our yard in 5th gear, it just stops. I assume that the
drive belt needs adjustment, because it looks OK. If there is no
adjustment, then I can assume it's stretched. Anybody know of an
adjustment.
Thanks,
Mike
On Thu, 20 May 2004 17:39:16 -0500 "Larry D. Goss"
<rlgoss at evansville.net> writes:
> Naw, they're paper elements too, Mike. I've got a half dozen of
> them
> out in the shop. But, not all filter paper is created equal.
>
> Larry
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Mike S
> Meulenberg
> Sent: Thursday, May 20, 2004 5:09 PM
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] OT - JD STX38 fuel problems
>
> I can try an OEM filter, but I bet it comes off the same line as my
> NAPA
> filter. I'm curious if the original filter was more of a screen
> versus a
> paper element. Phil, I tried vertical and horizontal, no change.
> I'll
> keep monkeying with it. Thanks everyone for all the help
> Regards,
> Mike
>
> On Thu, 20 May 2004 09:48:08 -0500 "Larry D. Goss"
> <rlgoss at evansville.net> writes:
> > What you've described here sounds like a typical vapor pressure
> > problem,
> > Mike. Greg's suggestion about a different brand of fuel filter
> may
> > solve it. Changing blends or octane ratings of gasoline may have
>
> > the
> > same effect. I've never been able to predictably determine when
> > the
> > fuel supply system is going to react the way you are describing
> it.
> > When I replace the fuel filter on John Deere equipment, I always
> use
> > the
> > OEM parts, but sometimes the filter fills and other times it
> > doesn't.
> > The running condition can change simply because of changes in the
> > weather. When I'm working on a customer's machine, I simply run
> > the
> > engine with hood closed and with all the side panels in place
> until
> > everything is up to ordinary operating temperature. If the
> engine
> > doesn't falter, I ship it back to the owner regardless of whether
>
> > the
> > fuel filter fills while it's running.
> >
> > Remember the good old days of vapor lock?
> >
> > Larry
> >
> > -----Original Message-----
> > From: at-bounces at lists.antique-tractor.com
> > [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Mike S
> > Meulenberg
> > Sent: Wednesday, May 19, 2004 10:42 PM
> > To: at at lists.antique-tractor.com
> > Subject: Re: [AT] OT - JD STX38 fuel problems
> >
> > I mowed again tonight, and here's what I observed:
> > 1. When I last left the mower the filter was empty and the shutoff
>
> > was
> > open, when I looked tonight
> > the filter was full.
> > 2. After mowing for a while the filter was empty, but it didn't
> > quit.
> > 3. About 3 hours after mowing the filter was again full.
> >
> >
> > I'm beginning to wonder if the fuel filter is providing too much
> > resistance to flow for a little mower without a fuel pump. Maybe
> > the
> > paper cartridge is too restrictive. I will check the carb again to
>
> > look
> > for any signs of the float sticking.
> >
> > Thanks,
> > Mike
> >
> >
> > On Tue, 18 May 2004 21:28:14 -0700 "Dean VP" <deanvp at att.net>
> > writes:
> > > 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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