Fuel Issues
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Freshman User
Joined: May 2018
Posts: 46
Likes: 0
From: Canada
yes that's what I'm thinking I get zero vacuum on the inlet side of the pump, could one of the fittings be sucking air causing the pump to not build vacuum?
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Freshman User
Joined: May 2018
Posts: 46
Likes: 0
From: Canada
Basic adjustment of the idle mixture screws is 1-1/4 to 1-1/2 turns out from lightly bottomed.
Raise your idle speed on the passenger side of the carb, there is a screw that bears on the choke operating arm.
With a full tank of gas, the fuel level in the line will be at about the exhaust level on the engine. A good pump will suck gas up the line to the pump inlet in a few revolutions while cranking. I suspect your pump either has junk on the check valves, or a leaking diaphragm.
Raise your idle speed on the passenger side of the carb, there is a screw that bears on the choke operating arm.
With a full tank of gas, the fuel level in the line will be at about the exhaust level on the engine. A good pump will suck gas up the line to the pump inlet in a few revolutions while cranking. I suspect your pump either has junk on the check valves, or a leaking diaphragm.
Fleet Mechanic
Joined: Mar 2005
Posts: 1,462
Likes: 185
From: Dedham, MA
You mean the fuel line fittings? If you put the vacuum gauge directly on the pump and it pulled no vacuum, that would eliminate the fuel line fittings between there and the tank. To rule out the pump, you could remove it from the engine, put small hose into a jar of gasoline and operating the pump actuator rod by hand to see if it pushed fuel out the other side. Do this LIGHTLY as you could damage the diaphragm inside if you crank on the actuator arm. If it works, pump is good. Just a matter of how it sits on the cam then, or a problem with the lines/tank fitting.
Fleet Owner
Joined: Jul 2004
Posts: 27,283
Likes: 1,046
From: NM
There are no other adjustments.
Thread Starter
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Freshman User
Joined: May 2018
Posts: 46
Likes: 0
From: Canada
You mean the fuel line fittings? If you put the vacuum gauge directly on the pump and it pulled no vacuum, that would eliminate the fuel line fittings between there and the tank. To rule out the pump, you could remove it from the engine, put small hose into a jar of gasoline and operating the pump actuator rod by hand to see if it pushed fuel out the other side. Do this LIGHTLY as you could damage the diaphragm inside if you crank on the actuator arm. If it works, pump is good. Just a matter of how it sits on the cam then, or a problem with the lines/tank fitting.
Thread Starter
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Freshman User
Joined: May 2018
Posts: 46
Likes: 0
From: Canada
no I made sure to check that, gasket it there and fuel bowl is good and tight.
Thread Starter
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Freshman User
Joined: May 2018
Posts: 46
Likes: 0
From: Canada
yes I replaced it, it was very dry rotted
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Parts Nerd Extraordinaire
Joined: Sep 2010
Posts: 4,327
Likes: 1,759
From: Western NY
Replacement fuel pumps are relatively inexpensive. You can get them from the local parts places:
https://www.napaonline.com/en/search...h_form-allprod
https://shop.advanceautoparts.com/p/...986%7CL3*15378
You might also want to look at your fuel pump push rod. They are known to wear which shortens their length which shortens the stroke on the pump making it move less fuel...
https://www.napaonline.com/en/search...h_form-allprod
https://shop.advanceautoparts.com/p/...986%7CL3*15378
You might also want to look at your fuel pump push rod. They are known to wear which shortens their length which shortens the stroke on the pump making it move less fuel...
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