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Post by kavid2013 on May 23, 2013 22:16:40 GMT -5
how does vacuum fuel pump work?
my scooter has vacuum operated fuel pump that is connected to fuel tank and other hose is connected to intake manifold, and the other is to the fuel filter.
how does it pump the fuel?
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Post by darkwingduck on May 23, 2013 22:26:34 GMT -5
Your fuel pump is operated by the vacuum of the compression of the motor. The vacuum operates a diaphragm contained within the fuel pump to release fuel.
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Post by alleyoop on May 23, 2013 22:34:40 GMT -5
The motor creates suction everytime the piston is on its down stroke after the Exhaust stroke. At that time the suction opens the Diaphgram on the Petcock and fuel flows then the spring pushs the Diapghram down and moves the fuel down the line.
Alleyoop
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Post by kavid2013 on May 23, 2013 22:37:35 GMT -5
is it supposed to be connected to intake manifold?
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Post by ej132 on May 23, 2013 23:31:15 GMT -5
Yes that's where it gets its suction
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Post by rockynv on May 23, 2013 23:54:33 GMT -5
It actually works due to the unevenness of the vacuum. With a single cylinder there will be a fluttering or pulsation in the intake which vibrates the diaphragm in the fuel pump causing it to pump the fuel.
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Post by chihuahuas on May 24, 2013 0:00:48 GMT -5
it SUCKs a spring down and then the spring pushes the fuel to where it goes.
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Post by alleyoop on May 24, 2013 0:05:56 GMT -5
Vibrates the diaphragm in the pump!! oy vey  no wonder my scoot was rocking and rolling. ;D It works just like you diaphgragm that holds the needle Air comes into the cylinder and pushs the rubber diaphgram up and the spring is putting pressure down. In the Petcock suction is on top pulls the Diaphgram up and then the spring pushs the Diaphgram back as soon as there is no more suction. How do you test your Petcock you do not BLOW into it you suck on the Vacuum Line to pull the Diaphgram up notice where the Vacuum connector is on TOP. IF you ever had taken one apart you would know how it works, pretty simple. Just like your ACV valve if there is one on your carb sameo sameo. The ACV valve also has a spring on top is always allowing air through but when there is a lot of Vacuum it pulls the Diaphgram up from the closed position and allows fuel to be sucked out of the carb bowl so it does not run lean on decel. Alleyoop |
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Post by gy6girl on May 24, 2013 1:38:48 GMT -5
Oh.. I see. It works like all pumps work. It has something that sucks the liquid in, then pushes it out the other side. Be it a diaphragm, piston, or fan. Got it.  |
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Post by rockynv on May 24, 2013 11:58:52 GMT -5
Constant vaccuum and it won't work as it is the pulses that are what pumps the fuel. That is why running wide open causes the pumps to stop pumping as the vaccuum pulse is netralized so the pump is only pulled in one direction and stays there without drawing any more fuel. Same principle as a lawn mower with a Pulse Jet Carb with the fuel tank below it.
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..BAD TO THE BONE..
