wmusket 0 #1 Posted February 8, 2013 I have a 310-8 with a 10 hp Kohler. I will not start and I troubleshot it to find my fuel pump is not pumping fuel to the carb. I took the fuel pump apart and it appears to be ok. The diaphragm isn't torn or anything. Do these just go bad? Do I have to replace it? There is fuel getting to the pump because when I took it apart, there was fuel inside of it. any help is appreciated! thanks, Bill Share this post Link to post Share on other sites
SCOOBY 312-h 14 #2 Posted February 8, 2013 you should also check your tank vent on the fuel cap, to see if its plugged. the diaphrams do dry out and sometimes even very hard to tell if its bad. would you have any of the model and spec off the tractor and or engine. i would be able to get you the part numbers and the cost. if im not mistaken those pumps can be rebuilt, or at least you should be able to get the diaphram. get me the numbers and ill see what i can do oh yeah and i need to know if the fuel fittings in the pump are pressed in or threaded in Share this post Link to post Share on other sites
rmaynard 16,349 #3 Posted February 8, 2013 (edited) The pump is more than just the diaphragm. There are two little round spring loaded one-way wafers. One or both may be stuck open or closed. One wafer is in the inlet area and allows the fuel to enter. The other is in the output area. When the diaphragm pulls down, one wafer opens and lets the fuel in. The reverse happens when the diaphragm pushes the fuel out. Edited February 8, 2013 by rmaynard Share this post Link to post Share on other sites
wmusket 0 #4 Posted February 8, 2013 The pump is more than just the diaphragm. There are two little round spring loaded one-way wafers. One or both may be stuck open or closed. One wafer is in the inlet area and allows the fuel to enter. The other is in the output area. When the diaphragm pulls down, one wafer opens and lets the fuel in. The reverse happens when the diaphragm pushes the fuel out. When I took the pump apart, I didn't notice any springs. I saw the little wafers and, I was able to remove them and then put them back. When I installed it on the tractor, I turned it over with the carb side fuel line disconnected and no fuel came out. Share this post Link to post Share on other sites
wmusket 0 #5 Posted February 8, 2013 When I took the pump apart, I didn't notice any springs. I saw the little wafers and, I was able to remove them and then put them back. When I installed it on the tractor, I turned it over with the carb side fuel line disconnected and no fuel came out. Quote MultiQuote Edit Share this post Link to post Share on other sites
wmusket 0 #6 Posted February 8, 2013 you should also check your tank vent on the fuel cap, to see if its plugged. the diaphrams do dry out and sometimes even very hard to tell if its bad. would you have any of the model and spec off the tractor and or engine. i would be able to get you the part numbers and the cost. if im not mistaken those pumps can be rebuilt, or at least you should be able to get the diaphram. get me the numbers and ill see what i can do oh yeah and i need to know if the fuel fittings in the pump are pressed in or threaded in I have a Kohler M10S. I think the fittings are pressed because I can turn them without them coming loose. If they were threaded, I imagine they would be tight. Share this post Link to post Share on other sites
SCOOBY 312-h 14 #7 Posted February 8, 2013 you can try ur local dealer but the part number is 47-559-11s for the whole pump, and i didnt see any rebuild parts on my breakdown, the pump costs 150.24 + tax,,,,witch is kinda pricey,,,,,id try ur local dealer maby they might be cheaper. hope this helps out a little. Share this post Link to post Share on other sites
leeave96 490 #8 Posted February 8, 2013 If all else fails, you can get an electric fuel pump for about $50 at napa. Share this post Link to post Share on other sites
SCOOBY 312-h 14 #9 Posted February 8, 2013 oo i forgot, if you go to kirk engines.com he has a new eletric low vollume pump for small engines, i cant remember how much it is. Share this post Link to post Share on other sites
wmusket 0 #10 Posted February 8, 2013 If all else fails, you can get an electric fuel pump for about $50 at napa. I saw the electric fuel pump at Advance auto and Napa, but I think these are for cars/trucks. Would this be to much flow/pressure for the carb? Share this post Link to post Share on other sites
can whlvr 994 #11 Posted February 9, 2013 check that there isnt something plugging the tank screen,i know you said there is some fuel at the punp,but its worth a look,they get plugged alot,id take off the line at the petcock to make sure the fuel is flowing before buying a pump,im fairly sure you can get the plastic replacement pump for alot cheaper than 150,i got one from stens for around 50 bucks up here in ontario Share this post Link to post Share on other sites
Wheel-N-It 2,976 #12 Posted February 9, 2013 Go to NAPA and get part number 7-08011 ( fits the magnum 10hp ) This is the direct replacement fuel pump. I paid $38.50 for mine about two or three weeks ago. Before you connect the fuel hoses to it, install a new in line fuel filter. Splice the fuel filter in the fuel line behind the engine in the open space between the engine and the steering shaft. Then fill the tank with gas and make sure fuel flows freely from the end of the hose that connects to the inlet side of your new fuel pump. If the gas flows free then all is well there. Install a new fuel line between the pump and the carb. Start the engine and report back here. 1 Share this post Link to post Share on other sites
sorekiwi 761 #13 Posted February 9, 2013 As Van said, before you hook up the line to the inlet side of the pump, bleed all the air out of the line - make sure you have a good flow of fuel at the front of the tractor before you hook it up. Sometimes the pump wont work until the line is primed right up to the inlet. 1 Share this post Link to post Share on other sites
