Bad Fuel Pump

[persof 14]

My 1988 312-8 quit running today.  Before it quit completely I got it to run weakly with full choke so I suspected crud in the carb.  I took the bowl off and removed a fair amount of crud, squirted cleaner thru the main jet and figured my troubles were over but it would not run at all with out starting fluid.  I removed the line going from the fuel pump to the carb and cranked the engine and nothing came out.  If I lower the line below the tank level fuel pours out so the line from the tank is OK.  

I removed the fuel pump and worked the lever with my finger over the inlet and did not feel any suction.  Is there a rebuild kit?  Is there a diagram that shows how it is assembled?  All suppliers say "no longer available"

Any Ideas??
Francis
   

[gwest_ca-(File Mod) 10,496]

Here is a Stens pump
https://www.bantasaw.com/catalog/viewproduct.asp?i=&p=7645

The one currently available from Kohler is 47 559 11-S

Garry

[N3PUY 1,031]

Take the pump apart.   It may just be dirt in the pump.   I had one full of rust ... cleaned it out and it worked fine.
What can it hurt.
Joe

[BESTDOGEVER 218]

If  cleaning  it  doesn't work they're  available on amozon for about 30-35 bucks the cheap ones are the same as the 100 dollar ones from  kohler 

[BOB ELLISON 2,976]

Then -now-auto.com makes
Rebuild kits for kohler fuel pumps.
 

[953 nut 51,674]

       An electric fuel pump from a US seller on  will run you $ 20 or less and work well.

[BESTDOGEVER 218]

If the  replacement  works as well as the first  it should  outlast any of us  I got  27 years out of the first one. Over the years I cleaned it a few times and filled it with oil  to keep the rust down and  soften the  diaphragm. The new one is made here by a oem supplier it looks and works like the original. 

[persof 14]

I sprung for a new one from Kohler for $156 (OUCH) but even though the engine now runs it acts like its not getting enough fuel if the engine is under heavy load for more than 3~5 seconds?

Is there a fuel flow test?  I replaced the fuel filter the same time as the pump.  Turning the main jet (which was fine before) a 1/2 turn rich made no difference.

How much fuel should this thing pump at what RPM???

Thanks
Francis


I will be looking at http://then-now-auto.com/kohler-fuel-pumps-2/
 

If  cleaning  it  doesn't work they're  available on amozon for about 30-35 bucks the cheap ones are the same as the 100 dollar ones from  kohler 

[mikekot3 92]

Hello Francis,
Thanks for sharing the website.

[Horse46 512]

 on that link, I may need to visit there too.

[BESTDOGEVER 218]

Check the gas cap and  screen  on the  shut off  

[WH nut 553]

I sprung for a new one from Kohler for $156 (OUCH) but even though the engine now runs it acts like its not getting enough fuel if the engine is under heavy load for more than 3~5 seconds?

Is there a fuel flow test?  I replaced the fuel filter the same time as the pump.  Turning the main jet (which was fine before) a 1/2 turn rich made no difference.

How much fuel should this thing pump at what RPM???

Thanks
Francis


I will be looking at http://then-now-auto.com/kohler-fuel-pumps-2/
 

If  cleaning  it  doesn't work they're  available on amozon for about 30-35 bucks the cheap ones are the same as the 100 dollar ones from  kohler 

 

Did you properly adjust the carb after you had it a part?

[BESTDOGEVER 218]

Just a thought did you check the fuel line it might be collapsing . The ethanol in the gas will rot them pretty bad