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  #1  
Old 01-17-2018, 06:14 PM
gear1 gear1 is offline
 
Join Date: Sep 2008
Location: Pagosa Springs CO
Posts: 256
Default Fuel pump failure mode

Our RV8 has IO360M1A and a Tempest Fuel Pump #L15473. When cleaning up the aircraft yesterday after a long cross country I found a trail of gasoline dye behind the fuel pump drain tube. As a check, I pressurized the fuel system with the boost pump on the ground and no leakage was seen. Also, when pressurizing the system with the engine driven pump by cranking the engine, no discharge from the fuel pump drain was noted. The pump has accumulated 1400 flight hours since new.

Does anyone know how these pumps fail? Does the diaphragm slowly crack, or can the final failure be catastrophic? (I had planned to attend the 75th anniversary of my Navy Attack squadron in California this weekend but feel it would be risky to attempt the 9 hours of flight time over barren countryside.)

Any knowledge that you all might be able to provide will be appreciated.
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  #2  
Old 01-17-2018, 06:19 PM
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n82rb n82rb is offline
 
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Location: fort myers fl
Posts: 1,090
Default

Your pump is toast. Replace before next flight. At 1400 hrs you got way more than a life out of it.

Bob burns
Rv4 n82rb
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  #3  
Old 01-18-2018, 07:36 PM
Tim Lewis Tim Lewis is offline
 
Join Date: Aug 2006
Location: Bristow, VA
Posts: 173
Default

See minute 10 of this video from Tempest:

https://www.youtube.com/watch?v=_BfwuUjh_lA
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  #4  
Old 01-18-2018, 08:46 PM
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chrishalfman chrishalfman is offline
 
Join Date: Jan 2005
Location: LaVista, NE
Posts: 62
Default I'm no expert.....

....but I think that's cheating!!!! Great tip! I worked at the local car garage when I was in high school. Remember fighting the pushrod on mechanical pumps. This will take all the 'fun' out of it.
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-7A, 360+ hours on the Hobbs, ECi O-360 185 hp, GA200L Whirlwind prop
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  #5  
Old 01-19-2018, 01:29 AM
RV Jerry RV Jerry is offline
 
Join Date: Jan 2009
Location: Chino, CA
Posts: 202
Default

Put heavy grease on push rod ,can be done using finger , grease will help keep push rod in up position, helps to wipe as much oil off as possible, can be done without removing mag
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Rocket II
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  #6  
Old 01-19-2018, 02:09 AM
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Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,254
Default

Quote:
Originally Posted by RV Jerry View Post
Put heavy grease on push rod ,can be done using finger , grease will help keep push rod in up position, helps to wipe as much oil off as possible, can be done without removing mag
Spot on Jerry. and also a little grease on the gasket to help hold it in place on the pump helps too
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  #7  
Old 01-19-2018, 09:08 AM
gear1 gear1 is offline
 
Join Date: Sep 2008
Location: Pagosa Springs CO
Posts: 256
Default Thanks!

Thanks all, for the great explanations, and the Tempest video. Good stuff. Now on to the replacement.....
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Craig Taylor
RV8 flying
2021 VAF dues paid with thanks
Navy A7E Vietnam era
Ret. Corporate Pilot: Gulfstream, IA Jet, Jetstar, Falcon 10, 20, 50, HS125
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  #8  
Old 01-19-2018, 09:32 AM
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bullojm1 bullojm1 is offline
 
Join Date: Feb 2006
Location: Baltimore, MD
Posts: 1,047
Default Another Trick...

Another trick is to use some thin safety wire to wrap around the backside of the plunger while in the UP position. Once you get the fuel pump in place and the screws started, pull the safety wire out, then tighten down the screws. Works great!

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  #9  
Old 01-19-2018, 12:45 PM
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petehowell petehowell is offline
 
Join Date: Jan 2005
Location: MN
Posts: 2,297
Default What Mike said!

+1

Wire lacing cord or a cylinder base O-ring works great here , too. Just snip and pull out.

Quote:
Originally Posted by bullojm1 View Post
Another trick is to use some thin safety wire to wrap around the backside of the plunger while in the UP position. Once you get the fuel pump in place and the screws started, pull the safety wire out, then tighten down the screws. Works great!
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  #10  
Old 01-19-2018, 04:25 PM
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DanH DanH is offline
 
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Location: 08A
Posts: 10,354
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The secret super sticky grease....(drum roll please): Bosch point grease, 5700-002-005.
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Barrett IO-390
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