sabwjz Posted July 25, 2009 Report Posted July 25, 2009 My electric boost pump on my M20G drips fuel out the AN fitting that protrudes through the lower left NLG tunnel. I'm thinking that this is a case drain for the pump and may be a sign that it is leaking internally. Does anyone know what this drain on the boost pump is for? The dripping normally stops after a little while however the last time I flew it did not appear to every stop dripping as evidenced by the small puddle on the floor of my hanger the other day. Quote
Piloto Posted July 25, 2009 Report Posted July 25, 2009 Check to see if it leaks when it is running. A good leak check of the fuel systems follows (engine off): 1. Set mixture rich and open throttle. 2. Turn electric pump on. 3. Close mixture and throttle. 4. Turn electric pump off. 5. Verify you still have fuel pressure one minute after turning pump off. If pressure drops to zero you have a leak in the system. Check fuel lines, engine fuel pump, electric pump and carburator float check valve. José Quote
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