primer pump

by John LeBeau in 2 Stroke Technical Questions one year ago

Sorry, if this has been discussed.

I recently acquired an aircraft with a 582. The primer pump leaked around the stem and I replaced it. My system has an electric pump in series with the pulse pump. The primer pump suction line ties in between the two fuel pumps. If I turn on the electric fuel pump for long enough, it will push fuel through the primer pump and put it into the engine. Is there a problem with my new primer pump or is that the nature of the design?

It seems like this would happen unless there is a blocking feature built into the primer pump when it is pushed in. Im trying to determine if I just bought a bad primer pump or if I need to put a 2 way valve in series with the primer pump.

Thanks

John

Re: primer pump

by Petri Rintala » one year ago

Petri Rintala

1 2 4

I'm currently re-organizing my fuel lines on my airboat and came into the conclusion that the suction line of primer pump needs to be routed before the electric pump and not on the pressure side. In addition I will add the non-return valve on the primer inlet to ensure the electric pump will not try to pull the fuel from primer circuit. Not sure if this is correct way, but the only way I have now figured out

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Re: primer pump

by John LeBeau » one year ago

John LeBeau

1 1 2

Thanks for your reply. I'm just curious. Have you experienced the same issue that I described before making the changes. Did fuel push through your primer pump and into the engine when the electric pump ran without the engine running?

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primer pump

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