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I pumped the primer bulb and no gas is coming thru and the tank is full.

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Check for cracks in the line from the tank and in the bulb itself,,

Posted on May 26, 2011

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1 Answer

Primer bulb seems to be pumping but no gas. Tank is full


Rick, the primer bulb orifice is probably plugged in carburetor and the carb. will have to come apart to clean and inspect, at this point you had might as well get the diaphragm rebuild kit and rebuild the carb.

Mar 31, 2016 | Garden

1 Answer

Need to replace fuel lines....does the prime bulb connected to return fuel line or the supply fuel line


Hi stglass900...

Normally the big line will be the line the fuel filter is connected to inside of the tank, and is connected to the primer bulb.
The smaller of the two lines is the return line to the fuel tank from the carburetor after it is pumped thru the carburetor by the primer bulb.
Please take time to rate me

Aug 16, 2011 | Craftsman 25cc Gas Line Trimmer

1 Answer

I changed the primer bulb and now it's not getting


sounds like you hooked the lines up backwards, when you press the primer it is supposed to squirt gas into the tank on the return line cause what it does is draw fuel through the carb and back to the tank....filter line from tank goes to fuel pump side of carb and return line on carb goes to primer bulb then opposite line on bulb to tank...... so when you press bulb it draws fuel through filter in tank through carb and back to tank ! good luck! 2StrokeJim

Jun 17, 2011 | Homelite Garden

1 Answer

When I push the bulb to prime the weedeater nothing happens.


It helps to know the purpose and function of the purge/primer bulb. It is designed to draw fresh fuel out of the fuel tank (line with in-tank fuel filter) and send it directly to the fuel pump side of the carburetor. Also, it's vacuum effect helps out it's next function of drawing any air/old fuel out of the carburetor from the metering chamber and sending it back to the fuel tank after it passes thru the bulb itself. This is how a remote primer bulb functions. It doesn't have to be completely full of fuel for the engine to run either.
So, you need to check 1. The fuel filter in the gas tank 2. The condition of the fuel line connected to that filter (the line should be soft and clear, not yellow and brittle). 3. The status of the fuel inlet on the carburetor (open). 4. The condition of the fuel line from the carb to the primer bulb
5. The condition of the primer bulb and its' plastic fittings. (the bulb shouldn't have any cracks or be severely discolored . These things apply whether the bulb is a stand alone type or mounted on carb type.
Carburetor mounted bulbs develop their own unique problems of operation due to the check valves that control fuel flow below them in the primer base assembly of the carburetor. Those valves are fragile and sometimes fail (strong solvents and high air pressure ruin them) and the fuel doesn't move back and forth properly causing carburetor malfunction.

Oct 25, 2010 | Homelite Mighty Lite Lawn Trimmer

1 Answer

Asked to repair a McCulloch wipper snipper model TM251SST+. Found fuel line inside tank perished as well as outside primer bulb. Replaced with new. The petrol does not pump up when primer bulb pressed. I...


the primer bulb has the valves in it ,check the in line fuel filter.take outlet off primerbulb,should pump thru from tank,thru the primerbulb

Jul 11, 2010 | Garden

2 Answers

I need to know how the fuel lines are hooked up in my ryobi gas trimmer. All of the fuel lines rotted out. I took them out and I need to know the correct connection sequences (what goes where).


line runs from little filter in tank to carb.
line from carb. to primer bulb
line from primre bulb back to gas tank.
lines are 2 sizes
need to cut at angle end of lines in tank so you can get them thru holes
and grab with needle nose plyers and pull them thru.
make sure you put the little filter on end before you pull line thru and leave
enough so filter can move around the whole tank.
second line in tank is smaller and need to cut and pull it thru hole in tank to primer bulb

Jun 23, 2010 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

1 Answer

I had to replace the primer bulb on my saw , when I started I found the hoses were all dry rotted and crumbled , I know one hose goes from the bulb to the carborator, the other hose goes from the gas tank...


One line from the tank (that has a filter on the end in the tank) is the main supply to the carburetor. The other line in the tank has no filter and is the outlet side of the primer pump. There is also a line between the carburetor and the primer inlet side. The primer is supposed to **** fuel from the tank, through the carburetor and back to the tank. The main supply line is usually a little bigger than the primer pump lines. The tank should be vented through a separate screened hole or a vented tank cap.

Aug 27, 2009 | Garden

1 Answer

Gasline mixup


one line comes directly from the fuel tank (the one with the filter) to the inlet side of the of the carbruetor ( the bottom fitting on the carb.usually)
the other line coming out of the fuel tank is the return fuel line and it hooks up to the outlet side of the two fittings on the primer bulb
the other side of the primer bulb goes to the only fitting left to hook to at the carbruetor.

you have 2 different length fittings on the primer bulb itself
the longer fitting is your return line hook it up to your tank side and the short one goes to carb.fitting
when you get it hooked up press the bulb several times and see if it primes as it should(fuel moving thru lines) from tank thru carb. thru primer back to tank

Jul 10, 2009 | Ryobi Garden

3 Answers

Replacing fuel tank on craftsman edger and other fuel lines.......do not understand where to hook fuel lines back up?  any diagrams?


ok If you have a Walbro WT series carb "without" a built on primer bulb here it is. First off if the fuel lines disintegrated you MUST disassemble it and clean it out. The MOST infintesimle speck of gas line trapped, can allow good prime and bad operation. OK? Don't be lazy on this. Just be delicate removing the flaps gasket and diaphram. ZAMA GND-12 Is the replacement Gasket and diaphram kit fot that carb. Use a cleaner, compressed air or blow good thru it. OK Now...Primer bulb, Carb, and Fuel tank, re connects: Smaller Diameter line comes from Gas tank (Connect filter screen to this in tank) to the short Straight brass carb connector. Primer bulb suction goes to the bent carb brass connector. If small line brings fuel "in" this other line sucks it back "Thru the primer bulb" and the blow side of the primer bulb sends it back to the fuel tank! So...Small Line brings fuel "TO/IN" carb thru short brass connect on carb. Other carb connect goes to bulb suction "IN", Then primer bulb "Pressure OUT" goes thru the larger tube "back to fuel tank". Trust me I know how frustrating a simple diagram is to find online fo this set up. And if you have a carb problem on top of the hook up uncertainty you got frustration. Not only was online help hard to find (Mfg...etc NFG at all!) My local repairshop in BBrook NJ could not tell me how!!! and thats no lie! Walbro has a "generic" carb diagram but no "hook up info" specifically. Poulan don't list it either. And these things routinly fall to pcs. all 3 of mine crumpled together on yr. 3 of use.

Jun 15, 2009 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

32 cc Craftsman (Poulan) gas line replacement


Yes, you are right. The larger line goes to the primer bulb and only goes into the tank about an inch. The coupling just keeps the line from pulling out of the tank. The smaller line goes to the carb. This line must rest comfortably on the bottom of the tank with the filter attached to the end.

Jim

Jun 07, 2009 | Craftsman 25cc Gas Line Trimmer

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