How to prime A3 fuel system.

[my69camaro]

I've got a 3116 powered a3 that has been sitting in my parents back yard for 3yrs. Trying to get it up and going now. Installed good batts, cranks good but I'm not getting fuel. Little to no trickle loosening the fuel filter. I keep reading of priming with compressed air. Where/which line am I doing this to?

 

[porkysplace]

A few similar threads might help.

M35A3 - No Start - Lost Prime


M35a3 fuel problem


M35a3 lost power and now nothing

 

[wreckerman893]

You do not want to put a lot of air pressure on the system. You just want to push the fuel to the IP. Too much pressure and something will blow out. 5 PSI or less will do it.

 

[Monkeyboyarmy]

You may have to disconnect the return line to the tank and plug the tank side. This will pressurize the feed side without pressurizing the return side. The flow of fuel is from the tank to the piston pump, through the filter to the back of the head, through the head to a pressure check valve on the front, and through the return back to the tank.

 

[Warthog]

Also check the check valve on top of the tank. They are known to stick and cause fuel flow issues.

 

[M35A2-AZ]

If I remember when I had my A3 that the TM said to hold the throttle paddle down when your cranking it and it would take a little of that before it would prime.

 

[Scar59]

Also check the check valve on top of the tank. They are known to stick and cause fuel flow issues.

Warthog is spot on. Sitting that long the check valve at the top of the tank connecting to the fuel line is stuck closed, need to remove and clean it real well. Prime the short fuel line at the IP, reconnect, shot of ether, and fire her up. This has fixed several A3 no start problems.