Fuel starve at load, air in fuel line, tank vacum?
1994 KLR 650
It is absolutely a fuel starve problem, air in the fuel line between tank petcock and Carb.
In regard to my cutting out problem it turned out to be air getting in my fuel line between the petcock and outlet of fuel filter. Happened bad going up a steep grade at 65. I looked and could see air in the line after the filter. So I pushed the tube tightly onto tithe fuel tank petcock and the fuel filter and taped them both.
Then I remembered someone saying something about a vacuum in the fuel tank. So I popped the tank lid to take care of that if it was a problem. Off I go for 375 miles of major rough riding and probably 20,000+ feet in vertical gain and drop. No problems.
Then I get back to that same hill and halfway up it starts cutting out and valves clattering, unbelievable! So I get down there and look and there is air in the fuel line again. Both connections still taped.
So to test the vacuum theory I pull the fuel line off the petcock at the tank Nothing! Shouldn't fuel be flowing freely out of the tank at this point?
Somebody mentioned a possible issue with a butterfly valve in the petcock that gets messed up, anyone heard of this?
So if I do have a vacuum in my tank where are the vents I need to clear out?
Last edited by troutbum33; 08-20-2012 at 01:44 PM.