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Where is the fuel pump primer ? - Garden

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IF YOU CANT FIND ONE IT MAY NOT HAVE ONE NOT ALL MOWERS DO.

Posted on May 07, 2014

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My prime bulb looses pressure and first start is hard. I have to remove fuel line from filter and cover with thumb prime re install then first start takes time.


Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.

Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.

If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.

Dec 19, 2014 | Boating

1 Answer

Out of Diesel


This particular JD engine has an individual fuel pump for each cylinder. The injectors, fuel lines, and pumps are not accessible from outside of the engine. There is a hand primer pump built into the top of the fuel filter. Start by removing the rubber outlet line from the filter base and pump the primer pump until fuel come out of the filter base outlet. Ounce fuel comes out of filter reconnect the line and continue pumping by hand until the pump button feels solid, then crank engine until it starts. This works better if a helper is available to operate the starter while continuing to pump the hand primer. This is normally all that is needed after running out of fuel.

If fuel does not come out of fuel filter base there may foreign material inside of primer pump. Primer pump can be disassembled and cleaned. If fuel comes out of filter, primer pump become feels solid but engine does not start the fuel control rack inside of engine may be sticking in the off position. This may sometimes be overcome by clicking the key switch from off to on rapidly. If not you may have to have your dealer remove the governor cover to free the rack.

Mar 19, 2014 | John Deere 4020 Gas & Diesel Tractor...

1 Answer

How do you bleed the diesel fuel filter on a 1986 Toyota diesel Land Crusier?


I don't know a lot about these trucks but I can tell you that somewhere between the spin-on fuel filter and the I.P. (injection pump) is a 1.5" dia X 4" long steel primer. Just under the top of it is a spring. You will need to loosen or open the "Fuel supply line", at the I.P. (going from the filter, to the pump) and manually pump the fuel primer. Continue pumping the fuel primer until diesel flow from the opening. Quickly close off the drain-port or fuel-line, pump the primer a few more times (to increase line pressure and try to start your vehicle. After it starts, check for leaks. Let me know if I can help anymore. Good luck.

Mar 06, 2014 | Cars & Trucks

1 Answer

Can't get gas to start primer pump not working


Sounds like you have an air leak in the fueling system and air, not fuel is being sucked in to the primer, check the fuel line and primer pump gaskets or bubble (if it is the primer bubble type)

Aug 01, 2013 | Mtd Yard - Man 160cc, 21" Self - Propelled...

1 Answer

All of the fuel lines have broken due to age and now I do not have a good idea how to replace with new lines


In general, a fuel line runs from the fuel filter in the tank (check the filter for plugging) up to the carburetor inlet port (usually upper-most). The lower carburetor port goes to the inlet of the primer pump. Leave the other primer port open for the moment. With fresh fuel mix in the tank, try to pump fuel into the primer bulb--if nothing happens, move the line to the open port and see if it will pump. If neither one works, the filter is plugged, the carburetor is internally plugged, or the primer bulb is cracked or has a hole in it. Be sure to use original type fuel lines--not plastic. Once you have the primer bulb filling with fuel, install a fuel return line from the open primer port back into the tank through another hole. The engine should be ready to start at this point. Hope this helps!

Dec 28, 2010 | Garden

2 Answers

Chrysler voyager 2.8 crd 2006 wont start without pumping the fuel primer replaced fuel filter and housing . checked in tank no primer pump found ?


Even though your vehicle starts and runs but dies, Your fuel pressure doesnt seem to be pushing enough pressure. It could be a faulty fuel pressure regulator.

Nov 23, 2010 | 2004 Chrysler Voyager

1 Answer

I am replacing a primer bulb in a chainsaw and the lines are gone so i need to find out which line goes where


Leave both primer ports open, then attach the fuel line that feeds the carburetor from the fuel filter to one of the primer ports--pump the primer and if you guessed correctly, it should pump fuel into the primer bulb. That is the primer port that goes to the carburetor output connection. The other primer port connects to a short line that goes back into the fuel tank with no filter. Return the original feed line back to the upper carburetor port. Connect the open primer port to a short line that connects to the carburetor lower port. Be sure to use original rubber lines, not plastic. Hope this helps!

Jun 22, 2010 | Garden

1 Answer

I Need Diagram of Fuel Line Hookups For a Poulan 2075 Gas Chainsaw. I Have Two Lines Coming From Primer, Two Coming From Fuel Tank, and Two coming From Carburator.


The line at the rear of the fuel tank with the fuel filter is the main feed line to the carburetor and connects to the upper nipple. The lower nipple on the carburetor goes to one of the primer ports, and the other primer port goes back to the tank, which has no filter on the tank end. On the primer port, it is cut and try--remove the tank return connection and leave loose. Place the main fuel line on to one of the primer ports and try to pump fuel into it with several pumps.Make sure the filter in the tank is not plugged. If nothing, shift the line to the other port of the primer and try pumping again. When successful, remove the main fuel line and return it to the upper carburetor port. Run a new line from the lower carburetor port to the active primer port and try to pump fuel again. If it won't pump fuel, reverse the two connections at the carburetor and try to pump again. If still nothing, there is trouble within the carburetor which should be cleaned with spray carburetor cleaner and maybe re-kitted. When you can finally pump fuel through the carburetor, then attach the tank return line to the open port on the primer bulb. Hope fully, the engine should run at this point. Hope this helps!

Jun 19, 2010 | Garden

1 Answer

Fuel lines from primer bulb


Finding the correct ports on the primer pump are trial and error. Remove the main fuel line from carburetor and place it on one port on the primer (the other port should be left open). Pump it--if correct connection, it should pump fuel from the tank into the bulb. If nothing, place the line on the other primer port and repeat the pumping. One of these two connections should draw fuel from the tank. Install the line that goes to the tank (but no filter inside) on the empty primer port and remove the main line from the primer and connect it back on the carburetor. There is a lower side port on the carburetor that should go to the just-vacated port on the primer. Operate the primer again and it should pull fuel from the fuel filter into the carburetor, through it, and back out to the primer port, then back into the tank. Hope this helps!

May 23, 2010 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

Poulan 2150 put new fuel lines on geting gas trew line put the primer buld will not prime and somtimes gets stuck but will release win i pull it of carb


Check the condition of the primer bulb for hardness or cracking. If ok, remove the line that goes from the bulb back into the tank and try to pump fuel from the carburetor. If nothing, switch the position of the other line at the back of the primer and try to draw fuel again. If hooked correctly, the primer will pull fuel through the carburetor body filling all cavities and into the primer bulb. If still nothing, try switching the lines at the carburetor (it should not pump backwards through the check valves in the pumper chamber). If still nothing, switch the primer connection again. Some combination of line connections should allow fuel to be pumped through. When correct, reconnect the loose primer line to allow fuel to return to the tank. This is a good reason for replacing only one line at a time. Hope this helps!

Apr 24, 2010 | Garden

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