I have a JD LT155 Lawn Tractor and I had to replace the fuel pump since it was a mechanical one and the diaphragm was gone in it. After I had changed it the tractor would not start unless I poured a little gas into the carb and then it would start and stay running for however long I needed it to run. I replaced the fuel filter thinking that it may be that, but still doing the same thing. Anyone have any ideas what could be the issue? I don't want to nickel and dime it if it something simple. Thanks any help would be great.