engine fuel primers 1969 T337D
 

I was out to fly on saturday and my rear fuel pump wouldn't run. Normally this would be a no go, but I remembered I have fuel primer knobs on the plane and used the rear one and got the engine started. I decided not to fly due to an abundance of caution and was able to verify a loose connection back at the hangar that my mechanic is looking into. My question is this. In the POH these are mentioned exactly once, in a diagram showing the front panel and they are called out with the word optional, so must not be on every plane out there. But there is no explanation of how and when to use them. I pumped it like 10 times and the engine started. It must work because without cycling the electric fuel pump it will not start. Does anyone have these and a POH that describes how to use them?

I have never used them. The only reference in my 1968 POH is the photo diagram that points them out as fuel primers. Not sure why Cessna included these but the Skymasters were built in the single engine production line...........

Primer
 

Used them to hand prop engines when I left the masters on and battery dead. Flew to a nearby airport that had a fog had battery charged enough.to start and get alternators on line. Went back and got my passengers. Remember if you have no voltage you have no gauges radios and electric fuel pump. The alternator restart would not work . With a dead battery no way to pull in master relay so battery stays insulated.

Owners Manual
 

Here is the information on engine primers from my owners' manual - 1966 Super Skymaster.

This indicates they are meant for Cold Weather starts.



Jeff

thanks for pointing that out. I was looking in the fuel system description, figured it had to be there. There is the same recommendation in the cold weather operations section of the 1969 T337D POH. mystery solved