Experienced gardeners share their insights in answering this question :
The top one is the return to tank

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One is the high pressure line, which sends fuel to the injectors. The other is the return line, which dumps fuel that the injectors don`t use back into the tank.
The return line should direct fuel close to the bottom of the tank and away from the pickup.
The (clear) fuel intake line runs from the top of the carburetor (straight nipple) and goes to the short post on the back of the primer bulb. The return line (blue) comes from the long post on the back of the primer bulb and goes into the bottom of the fuel tank.
If you`re talking about the big hoses inline with the carburettor, there`s an air intake hose from the air filter to the carburettor and a manifold hose from the carburettor to the intake port of the engine.
The supply hose is connected to the fuel filter. The return hose is connected to the top of the fuel tank. The vapor return hose is connected to the charcoal canister.
The (clear) main fuel line with the filter (filter inside the fuel tank) goes to the bottom of the carburetor (or the elbow shaped nipple). The (clear) fuel intake line runs from the top of the carburetor (straight nipple) and goes to the short post on the back of the primer bulb.
The fuel line typically consists of rigid metal pipes, with flexible rubber or plastic hoses running from the pipes to the tank and the fuel pump , and from the pump to the carburettor .
Most vehicles have rubber fuel hoses connecting the fuel pipes on the chassis to the fuel pump or carburetor on the engine. Rubber hoses are flexible and can be cut to length as required, but they have a tendency to perish over time and can rub through if not properly secured.
The return line opens to the fuel bowl of the carburetor. This return line is separate from the fuel line. A fuel pumping means is connected to the fuel line for passing fuel at a desired rate from the fuel tank through the fuel line to the carburetor.
The fuel return hose is a fuel system hose that is found on vehicles equipped with carburetors. It`s primary purpose is to return excess fuel from the carburetor to the fuel pump, however it serves other important functions as well.
The main colors used in ISO 14726 are as follows:

Blue – Fresh water. Brown – Fuel. Green – Sea water.

If the car is designed for right-hand traffic, the fuel cap is on the right and vice versa. The very simple reason for this is that in the event of an emergency, such as running out of fuel away from a gas station, it is safer to refuel the vehicle with a canister on the side facing away from traffic.
No. A carbureted engine uses a low pressure fuel pump to deliver fuel to the float bowl of the carburetor.
A fuel pump draws the fuel from the tank through fuel lines and delivers it through a fuel filter to either a carburetor or fuel injector, then delivered to the cylinder chamber for combustion. The fuel tank is the main storage for the fuel that runs the vehicle.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Fuel line goes into tank bottom line has filter how long is the top fuel line? this is coming from the primer bulb.
ANSWER : Fuel Line Replacement by

The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
If the saw is equipped with a primer bulb, an output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
The pressure side of the primer returns displaced fuel to the tank as it is depressed.
Take lots of notes and a few digital photographs to help with reassembly.

The line with the filter needs to be long enough to reach all parts of the tank as the saw is moved, a little to long is probably better than to short. The line returning from the primer is not critical so long as it cannot fall out (mid tank). All the primer line does is return excess fuel to the tank. Does this answer your question?

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Replaceing fuel line in polan 3300 chain saw – Poulan Pro 42CC 2 Cycle Chainsaw, 18"
ANSWER : Hi owjbhend…
Use a piece of wire and insert it into the fuel line, then bend a hook in the end and hook it over the end of the fuel line…lubricate the fuel line with some vaseoline very lightly…about the first one inch of the fuel line and then use your fingers to start the fuel line into the tank, once you have the fuel line in the tank give enough to hook the fuel filter to and so it can be dropped back into the tank.
Below is a drawing of how to route the fuel lines.
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Poulan te 450 cxl fuel lines need routed correctly two line both in tank one to fuel filter other line?
ANSWER : Other line is just left open like to send gas back from the carb.

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Which fuel lines go where on Craftsman hedge trimmer, just replaced fuel lines and forgot where big line goes and small line goes

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The fuel lines have rotted out of the edger gas tank. How do I fix or do I need to replace entire tank with new fuel lines?Since there are no male fuel line connections exiting the fuel tank and just two holes where the lines were, I guess I need to replace the entire tank and get a new one with lines already attached. Thanks.
ANSWER : No you can buy replacement fuel line but you must reconnect the filter in the tank that line goes to the bottom of the carby then out the top of the carby to the inlet on the primer then out of the primer and back to the tank.

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Fuel line diagram for craftsman gas blower – Craftsman 25cc Gas Line Trimmer

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CRAFTSMAN WEED WACKER WHAT IS PROPER FUEL LINE ROUTING ? Replaced fuel tank and fuel lines now it will not start does someone know the proper routing of lines?

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Need to replace fuel lines on my Troy Bilt gas hedge trimmer. Where can I get replacement fuel lines… or better yet… what size are the lines and where can I buy a few feet of the lines. Note: I have reviewed the parts assembly and it would seem to indicate I have to replace the entire handle assembly (Part #1) instead of just buying replacement hose(s). Any help to resolve my issue would be greatly appreciated and thanks in advance
ANSWER : Replacement fuel lines should be readily available at your local lawnmower repair shop. Your TroyBilt hedger uses fuel line that is 3/32″ (2.4mm) interior dimension, 3/16″ (4.8mm) outside dimension, with a 3/64″ (1.2mm) wall dimension.
Most manufacturers don’t offer replacement line, only fuel tank assemblies. Find your local shop, and try to get the TYGON brand…it is yellow. Tygon lasts the longest. You should be able to buy it by the foot for less than $2 per foot. You will need 2 feet of hose to replace both lines.

Make sure to clean the in-tank filter when replacing hoses.

Good luck.

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