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Need to know the proper hookup for the fuel lines from the fuel tank to the carb

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They can only go one way or the other. Try one and see. Then try the other way if it does not work. Good luck...Lee

Posted on Nov 14, 2009

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Homelite UT-08544 fuel line which one goes to bulb which one goes to carb


I wish those posting answers could get things right.

The remote primer does not push fuel into the carburetor; it for pulling fuel mix through carburetor removing air line the system.

Here is the basic setup for a remote primer.

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Not sure if your primer bulb is on the carb or separate but here are some basics... The smaller line is the main fuel line. It has the fuel filter on it and the filter should be laying on the bottom of the tank. That line goes to the fuel pump side of the carb ( usually the inlet near the center of the carb body ). The fuel goes through the filter up the main line and fills the carb then to the primer bulb whether its on the carb or separate. If on the carb the spigot closest to the primer bulb takes the larger line and returns to the tank. That line should go into the tank about half an inch and terminate. If the primer is separate the larger line leave the carb from the spigot on the metering side ( usually close to the edge of the carb body) to the inlet of the primer bulb then from the primer bulb out ( usually center of the bulb) to the tank and terminates about half an inch inside the tank. Remember... fuel filter into carb, carb to primer bulb, primer bulb to tank. If the fuel does not go that direction when the bulb is primed then you have lines hooked up backwards.

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1 Answer

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If there are two different size lines in the tank the smaller one is the main fuel line. The main fuel line will have the filter on the end of it in the tank and the filter should lay flat on the bottom of the tank. The main line will go directly to the carb on the fuel pump side. It is very difficult to describe and I dont have a way of giving a picture. If you have had the carb opened up the fuel pump side is the side that is mostly flat with holes and the dighram with the flaps.
The other nipple; usually more toward the center of the carb body, will go to the primer bulb. The primer bulb will have 2 different length nipples. The longer one is out to the tank, the shorter one is in from the carb. There is no need to have more than a half inch of line from the primer into the tank. when hooked up properly; as you press and release the primer bulb it will draw fuel up the main fuel line into the carb and fill the carb with fuel then from the carb to the primer bulb and fill the primer bulb with fuel then the excess fuel will be returned to the tank from the primer bulb.

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I have no diagram but here are the instructions on how it goes.
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so.

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1 Answer

I HAVE A RYOBI VAC/BLOWER MODEL RGBV3100 THE FUEL LINES NEED REPLACING THEY ROTTED OFF NEED TO KNOW WHICH WAY TO ROUTE FROM PRIMER BUTTON TO CARB


The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so

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1 Answer

I have a Ryobi 700r trimmer - I needs a diagram of all the fuel line hookups


<div id="ms__id6" class="solution-text"><span id="ctl00_ctl00_MainColumn_CenterColumn_ThreadSolutions1_Repeater1_ctl00_lblSolution">This is an ongoing issue for users, and rightfully so. Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.<br />If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank.</span> </div><!-- from fixya rte -->

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1 Answer

Replacing fuel lines on ryobi weed eater,need


This is an ongoing issue for users, and rightfully so. Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.
If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank.

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1 Answer

I replaced the primer bulb and the unit worked fine for a while, but then the fuel line came loose. When I tried to reattch it, it broke. When I pulled the cover off there were three lines, two from the...


One line goes from the fuel filter in the tank to the primer. One goes from the primer to the carb. The last one goes back to the tank. Hope this helps...Lee

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