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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