Posted by oldtanker on September 21, 2011 at 08:54:40 from (66.228.255.223):
In Reply to: Fuel Problem posted by Dennis (VA) on September 21, 2011 at 07:49:45:
OK a mechanical fuel pump has a diaphragm in it to both create vacuum (suction) and pressure. It also has 2 check valves. When on the suction stroke it pulls the pressure or out side valve closed and sucks the intake side open pulling gas into the chamber. On the pressure stroke it sucks the intake side closed and when it builds enough pressure pushes the out put side open sending gas to the carb. If one or both of the valves is bad it may still work but not well and can take a little time to prime itself. It can also allow gas to drain back into the tank from the lines and pump. It will not siphon gas out of the carb becasue of the design of the carb. Gas enters the carb through the needle and seat that is controlled by the float. Every carb I've worked on has the needle and seat in the top cover and there is no direct line or tube into the gas in the bowl from the fuel line.
So take the air cleaner off and with the choke plate open manually operate the throttle lever while looking down the throat. You should see gas squirting into the throat on a car of truck engine. If not the bowl may be empty showing a fuel supply issue or the accelator pump in the carb is bad. If it kinda just dribbles the accelerator pump is bad or they is a plugged passage in the carb. If as you say the bowl is empty then you have a carb issue that will require rebuilding or replacement. You can check that by disconnecting the fuel line at the carb. If it starts to dribble and or squirts gas as you are taking it off stop. You can test the fuel pump by taking that fuel line at the carb and installing a fuel presure gauge (smart safe way) or just leave it off and bump the starter. If you get pressure or gas pulses while cranking right away you have eliminated the fuel pump.
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