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

[Brad Haslett]

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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