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Old 12-08-2015, 10:31 AM
JDanno JDanno is offline
 
Join Date: Apr 2008
Location: Tennessee
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Default Leaking fuel pump

Thirty hours on new engine
I was testing for leaks in the fuel system as I had noticed a fuel spot on the floor after the last flight after shutdown. Throttle 2/3, mixture cutoff, boost pump on and I get quite a bit of fuel out of the fuel pump from the overflow line onto the floor. Is this normal? After thirty hours I have never seen that before. Thanks!!
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  #2  
Old 12-08-2015, 10:48 AM
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mikeyj350 mikeyj350 is offline
 
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I believe this is indicative of a failed mechanical pump diaphragm? If you run the boost pump with the mixture in cutoff (and throttle anywhere) I don't believe any fuel should be flowing at all unless you have a return system.
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  #3  
Old 12-08-2015, 10:49 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by JDanno View Post
Throttle 2/3, mixture cutoff, boost pump on and I get quite a bit of fuel out of the fuel pump from the overflow line onto the floor.

Is this normal?
No.

It is an indication that there is a failure of at least one of the fuel pump diaphragms.
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  #4  
Old 12-08-2015, 10:57 AM
JDanno JDanno is offline
 
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Thanks! That's what I suspected but with only thirty hours ??!!
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Old 12-08-2015, 11:41 AM
BillL BillL is offline
 
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Quote:
Originally Posted by JDanno View Post
Thanks! That's what I suspected but with only thirty hours ??!!
Just observationally, yes. There are been several reported here in the last year.
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