I don't know how it works on a constant vacuum either. Every 4 cycle pulse pump I've worked on hooks to the crankcase, and the pulse from vacuum to pressure is what drives them.
However, I did find this old post on an ATV forum:"there is a fuel pump under the front left hand side on the front guard.
it is driven by the vacum from the motor.
most likely it is not broken! they have a good reputation.
with the 250 and 300 LTF kingquads made by suzuki, when ever you cannot get fuel to the carbi, just put the fuel tap on to prime, then blow in to the fuel cap vent hose (the one sticking out of the fuel cap)
once you clean the dirt off it, blow with your mouth for about 10 seconds with the same sort of pressure you would blow up a baloon.
while you are doing this... crank the bike over with the starter button (to activate the fuel pump)
this is what every motorcycle shop must do to the LTF 250/300 every time they get a new bike out of the crate and fuel it up for the first time.
The LTF seems to have a good pump as far as durability goes, but it is just a little weak when it comes to filling up the carbi when the bike is dry.
if you have any doubt about fuel getting to the carbi, pull off the fuel line (the hose that is going to the carbi with the metal spring protective cover) pull it off the carbi and see how much fuel comes out when you crank the bike over.
I say this because it is no good chasing a fuel pump problem if you only have a dirty carbi that needs cleaning"
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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