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I have a 1983 bobcat 743b that needs a new fuel filter. i have taken off the old one. how do i replace it with a new one? and are there any steps after replacing the old filter, like: priming the filter with the primer bubble? or filling it with diesel fuel before installing the new filter?

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: spear and jackson chainsaw. runs

OK - let's work through this. If you need choke all the time then the mixture is too weak when the choke is off. Putting the choke on literally chokes off the air supply to the engine by lowering a small shutter across the entrance to the carburettor. That means either there is too much air getting to the engine (don't see how!!) or too little fuel. So, how do we get too little fuel? You could check for this as follows;
- before we do anything tricky let's check the obvious things - is there a fresh fuel mix in the tank? Petrol does go off, especially if there is 2 -stroke oil added to it. If it's over a month old from the pump mix up a fresh batch. Is the idle speed set too low so the engine stalls when the choke is knocked off? You can see this screw to one side of the carburettor (you need to remove the top lid in front of the handle on the chain saw, and then remove the air filter to see it). Turn the screw half a turn clockwise to speed the engine up. Be warned - if the engine starts it will run faster than normal and that means the chain may start to spin around. Also - check that the chain brake is off (i.e. the safety lever is pulled backwards, and that the chain is free to move BEFORE you attempt to start)
- is the fuel filter blocked? To get to this, make a wire hook (e.g. thick fuse wire) and gently hook out the fuel filter that's sitting at the bottom of the fuel tank, and take a look at it (be gentle - you can damage the gauze if you are clumsy). Does the gauze look clear? I.e. if you dip it into petrol it will freely run into the filter and of course drain out when you lift it? If not, replace it.
- next stop - are the jets in the carburettor set right? I don't have a service manual for this (and I know the manual says unhelpfully "return for service") but basically you will have seen two holes on the side of the chain saw (below the handle) two small 0.8cm holes; one marked 'L' (for low speed) and the other 'H' (for high). Put a fine flat screwdriver down the L hole and feel for the slot of the low speed jet. Once engaged turn it out half a turn and this will enrich the mixture - if this seems to help and you can start the engine then adjust the L jet in or out until the engine is idling comfortably. If it idles too quickly then you can also turn down the idle screw (see previous paragraph).
- no luck still? Well, it could be fuel pump or a blocked jet in the carburettor but this really is a 'return to the service centre' task!

Good luck!

Posted on Jan 12, 2009

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SOURCE: Replacing a fuel line for a Poulan 2175 type 2 chainsaw

Take top cover off(3 screws). Take off the 2 nuts holding the carb on. Pull carb part way out to access the hoses. Remove the 3 old hoses after making a diagram of where they connect. Buy new hoses. Cut one end of the small hose on a bevel, pierce both sides 1/8 th inch from the end with a needle. Thread a thin wire through both holes. Thread both wire ends into the gas tank. Use a hemostat or long needle nose plyers to pull the wires and then hose down into the tank. Attach the weighted fuel filter. The other end of this smaller diameter fuel line goes on the upper nipple on the carb. Take the side cover off (4 screws) to access the primer bulb. Take 2 screws out to remove the bulb which has 2 nipples. The longer nipple connects to the larger diameter hose which goes to the fuel tank. The larger diameter tube has a coupler on the end which is inside the gas tank. It took me an hour to change all 3 hoses.
Bob

Posted on May 14, 2009

VtToolMan
  • 704 Answers

SOURCE: gas primer bubble cracked. How to find replacement

The part your looking for is called a "primer bulb" and is relatively inexpensive (under $3).

The exact bulb you need depends on the model chainsaw you have. Lacking a model number, I've provided a link to a site where you can verify which model McCulloch chainsaw you have and thus, which primer bulb you need to replace your cracked on with.

http://www.mymowerparts.com/partdetail/1125/15474.php

Once on the page, you can enter "primer bulb" in the quick search box and it will show all bulbs for all the chainsaw models available. About the 3rd section down will have the McCulloch bulbs listed.

Hope you find this Very Helpful and best regards!

Posted on Aug 20, 2009

dontbother10
  • 2220 Answers

SOURCE: I have a McCulloch 3200 chainsaw on which I

From the fuel tank to the carb, from the carb to the primer, from the primer back to the fuel tank. The bulb sucks fuel through the carb excess fuel is returned to the tank. HTH
Lou

Posted on Oct 08, 2009

dontbother10
  • 2220 Answers

SOURCE: Primer bubble

From the fuel tank through the carb back to the tank. Just like the fuel system I sent you Scotty.

In case a different Scotty.
http://www.fixya.com/support/r3706813-2_cycle_fuel_system_repair

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Posted on Mar 10, 2010

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