[Rhodes22-list] Reply for Brad (Help solve a problem.)

Sat Nov 29 09:14:18 EST 2008

My John Deere has more safety switches and crap on it than I could possibly  
fix myself. If it ever stops running, it's going back to the dealer without 
any  hesitation. 

Rummy

In a message dated 11/29/2008 9:11:23 A.M. Eastern Standard Time,  
flybrad at gmail.com writes:

Rummy,

My son and I replaced the whole pump yesterday ($30) and  it still
won't run on its own but does when you spoon feed it fuel.   The new
pump did fill the filter and line whereas the old pump  didn't.  My
brother still thinks it is an intake valve out of  adjustment (overhead
valve engine) but my airplane mechanic thinks it is  the carburetor.
I'm headed to the hangar this morning to try the valve  adjustment.
Since this thing gets used for less than a dozen hours a year  in its
new role, I'm only going to use AvGas in it from now on. Look at  the
bottom of the bowl on your John Deere and tell me what the  solenoid
does.  Is that the fuel shut-off from the "kill switch" or  part of the
auto-throttle?  I assumed that the "kill switch" shut-off  ignition.
The net has been of little help finding the answer. If that turns  out
to be the culprit I'll just remove it and plug the  hole.

Brad

On Sat, Nov 29, 2008 at 7:39 AM,   <R22RumRunner at aol.com> wrote:
> Brad,
> Sounds like he's  saying just replace the diaphram. Odds are that at fifteen
> years it's  seen better days.
>
> Rummy
>
>
>
>  ____________________________________
>  From: JTonjes
> To:  R22RumRunner
> Sent: 11/29/2008 8:35:34 A.M. Eastern  Standard  Time
> Subj: Fwd: Help solve a  problem.
>
>
>
>
>
>
>  ____________________________________
>  From:  terry at leisuretimesportstomah.com
> To: JTonjes at aol.com
>  Sent:  11/29/2008 7:09:43 A.M. Eastern Standard Time
> Subj: RE:  Help solve a  problem.
>
>
> Good   Morning...
>
> This type of  fuel pump has been around for  years.  We've had it on
> snowmobiles since  the early 70's  and its still being used on ATV's today. 
 My
> experience  is  you can look at a diaphragm until you're blue in the face 
and see
>  nothing  wrong with it but it doesn't work.  They do make rebuild  kits 
for some
> pumps and they usually work good and range in price from  $6-$10...I'd 
check  the
> vacuum line that usually comes off the  intake and make sure its  ok..rubber
> hoses do go bad and  leak...also spin the motor and put your thumb  over 
the end
> of  the hose and see if you feel vacuum....like a little sucking  on  your
> thumb.  Valves do tighten up in some motors but usually its  the  exhaust 
valve and
> not the intake...If its 15 years old and  never touched I'd  check valve
> adjustment too but I don't think  that's the problem in this  case...I'd 
bet more on
> just a bad  pump...We sell a small Mikuni pump for  around $20. that's used 
 on
> a single cylinder but who knows what an  exact replacement  would be from
> Kubota...might be big $$$...any type  pump would  work but you probably 
would have
> to refab the mounting   bracket.  He didn't say if it was mounted directly 
on
> the engine,  which  some are, or is it a separate pump mounted someplace   
else.
>
> Guess that's  all I can tell ya...
>
>  -----Original Message-----
> From: JTonjes at aol.com   [mailto:JTonjes at aol.com]
> Sent: Friday, November 28, 2008 7:03   AM
> To: terry at leisuretimesportstomah.com
> Subject: Help   solve a problem.
>
>
> Chrome dome,
>
> Since I  know you don't have anything better to do today, any ideas on   
fixing
> this one?? This question came from a sailing list that I belong  to.  Brad 
is
> a pilot for Fed Ex and a pretty good sailor and  mechanic.
>
> JT
>
>
>
>
>
>  While you're solving engine problems, have you ever dealt with a  pulse  
fuel
> pump before?  My airplane tug (Kubota lawnmower with a   Kawasaki 14 hp 
motor)
> quit running.  I replaced the fuel filter  and  discovered it isn't gravity
> feed and it doesn't have an  electric fuel  pump.  A little research on the 
net
> revealed  a new critter I'd never  heard of before - a pulse fuel pump.   It
> basically works like a  heart, pressure on one side with a  diaphragm that 
increases
> pressure on  the other side.  I  took it apart and the diaphragm looks fine.
> It could be a lack of  vacuum on the low pressure side due to intake valve
> clearances (their  pretty close and this thing hasn't been touched in 15   
years).
>  Anyway, never heard of this animal before today.   Have  you got any
> experience with them?
>
>  Brad
>
>
>
>
>  ____________________________________
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>
>
>  ____________________________________
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