formariz 11,988 #1 Posted December 5, 2019 Decided to change 520's fuel pump to an electric Facett. I recently replaced stock one with a new one and it works fine.However when blowing the 8 inches of hard snow going up my neighbors really steep driveway, tractor started surging in the middle of hill. Going downhill and level never an issue. Pretty sure that it was getting starved for fuel in the big incline. Blower load and steep incline just too much for stock pump to pull fuel from the low placed tank. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,102 #2 Posted December 5, 2019 Pump mounted below the fuel tank? They push fuel much better than pulling it. If you have the line off at the tank see if gravity will drain the tank with a steady uninterrupted flow. The screen in the tank may be restricted. Garry Share this post Link to post Share on other sites
formariz 11,988 #3 Posted December 5, 2019 Checked that already and it flows fast and easy. Screen is totally clear. Vacuum pump just not enough in that extreme condition. Electric pump will be mounted right under tank. Share this post Link to post Share on other sites
lynnmor 7,354 #4 Posted December 5, 2019 Did you use one of the cheap pumps like found on eBay to replace the stock one? I have never had an issue with the stock Onan pump no matter how hard it was worked. Share this post Link to post Share on other sites
formariz 11,988 #5 Posted December 5, 2019 4 minutes ago, lynnmor said: Did you use one of the cheap pumps like found on eBay to replace the stock one? I have never had an issue with the stock Onan pump no matter how hard it was worked. No. Pump was a more expensive one from the Onan parts place. This driveway is a very steep incline probably about 30 degrees for most of it. That coupled with the 7 to 8 inches of icy wet snow really put a load on tractor. Again, tractor never surges in any other condition or time, not even towing a trailer with over one ton of gravel in it. Share this post Link to post Share on other sites
WildmanC120 613 #6 Posted December 5, 2019 Maybe your float level is off. Share this post Link to post Share on other sites
formariz 11,988 #7 Posted December 5, 2019 38 minutes ago, WildmanC120 said: Maybe your float level is off. Went up same driveway today with no snow and blower off no problem. Tried it again with blower on, again no problem. I am convinced that with all that load in addition to the incline tractor was just not getting enough fuel. Share this post Link to post Share on other sites
Lee1977 6,808 #8 Posted December 6, 2019 The best thing I did to my 520 was an electric fuel pump. It was a bear to start with the stock pump. I broke it changing the fuel line. Put on an electric pump. Now when I start it I turn the switch on let the pump hit 3 or 4 times turn to start pull up the choke and right back down and it's running. Share this post Link to post Share on other sites
dclarke 4,034 #9 Posted December 6, 2019 I put an electric pump on mine, it sure starts easier. 1 Share this post Link to post Share on other sites
lynnmor 7,354 #10 Posted December 6, 2019 2 hours ago, dclarke said: I put an electric pump on mine, it sure starts easier. That mounting is not an option if there is a rear lift. I would like to see how others mounted an electric pump that will not interfere with anything. 1 Share this post Link to post Share on other sites
dclarke 4,034 #11 Posted December 6, 2019 39 minutes ago, lynnmor said: That mounting is not an option if there is a rear lift. I would like to see how others mounted an electric pump that will not interfere with anything. That’s true, I took the rock shaft out since this is my dedicated snow machine. Share this post Link to post Share on other sites
WildmanC120 613 #12 Posted December 6, 2019 17 hours ago, formariz said: Went up same driveway today with no snow and blower off no problem. Tried it again with blower on, again no problem. I am convinced that with all that load in addition to the incline tractor was just not getting enough fuel. Well if you are loading it then yes you will be burning more fuel. Unloaded the float hight probably won't make a difference. I still suggest to check this as the stock pump should be more than enough to feed the engine loaded and unloaded. 1 Share this post Link to post Share on other sites
