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#8876 06/07/08 11:14 AM
Joined: Jul 2008
Posts: 2
Novice
Acquired a mac 3214 which had been improperly stored and the fuel lines were rotted. I replaced them and the primer bulb. The saw runs, and I can keep it running by gently squeezing the primer bulb, but it does not seem to pump fuel itself -- without squeezing the primer it stalls. The line on the right of the carb, opposite side from the fuel input on the left, seems as though it might be to receive a pulse to work a fuel pump. But where does the other end of that line connect, to receive a pulse from the engine? Thanks!

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Joined: Dec 1999
Posts: 5,334
Likes: 30
Repair Junkie
****
rustypete,

Ok what you have not done is replace the diaphragms in the carby as they also will be damaged from the unleaded petrol.

The pulse primer is part of the carby which moves the pump diaphragm in the carby in order to such fuel from the tank but note that fuel should flow from the tank to the carby only a trickle.

Hope that this is of some help. cheers2


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[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
Bruce #8879 06/07/08 02:01 PM
Joined: Jul 2008
Posts: 2
Novice
Thanks you! I will inspect the fuel pump diaphragms. But where does the other end of that line connect, to receive the pulse -- is that in fact the purpose of that line? There seems to be another hole into the fuel tank for a line, but no pulse can come from there. I really am confused as to where the far end of the line on the right side of the carb connects.

thanks
pete

Joined: Dec 1999
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Likes: 30
Repair Junkie
****
Both line go into the tank as one is a pickup and the other is the return. cheers2


Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.

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