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leaking fuel pump overflow

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davemader(at)bresnan.net
Guest

Posted: Sun Mar 05, 2006 10:10 am Post subject: leaking fuel pump overflow

Can anybody tell me.  I have approx. 50 hrs on a rebuilt 0-360

Lyc. on my RV-6.  When I look at the belly after a few flying

sessions there is a small dark brown streak coming from the overflow

tube extending out about 1-2 inches.  Must be fuel because of no other

liquids in this area.  My fuel pump does vary anywhere from 2 to 5 lbs.

Should I be concerned?



Dave Mader

50 hrs, RV-6

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kboatright1(at)comcast.ne
Guest

Posted: Sun Mar 05, 2006 10:47 am Post subject: leaking fuel pump overflow

Are you running aviation fuel?  If so, I'd be surprised if the stain was 

brown. I'd expect a fuel stain to be blue. All the ones on my airplane are . 





Is it possible your crankcase vent tube or a minor oil leak is creating the 

brown stain?



KB

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denis.walsh(at)comcast.ne
Guest

Posted: Sun Mar 05, 2006 1:14 pm Post subject: leaking fuel pump overflow

Tell us what the overflow tube is.



If it is the vent tube from the engine driven fuel pump on a low  

pressure system it should not have anything coming out of it.  If  

something is coming out of it you should be concerned.



My fuel stains turn brown after a period of time.  Not sure why but  

presume it is lead from all that stuff in 100LL.

Denis Walsh



On Mar 5, 2006, at 11:05 AM, DAVE MADER wrote:



 	  Quote: 	
		   



 Can anybody tell me.  I have approx. 50 hrs on a rebuilt 0-360

 Lyc. on my RV-6.  When I look at the belly after a few flying

 sessions there is a small dark brown streak coming from the overflow

 tube extending out about 1-2 inches.  Must be fuel because of no other

 liquids in this area.  My fuel pump does vary anywhere from 2 to 5  

 lbs.

 Should I be concerned?



 Dave Mader

 50 hrs, RV-6

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jim jewell

Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada

Posted: Sun Mar 05, 2006 9:03 pm Post subject: leaking fuel pump overflow

Hi Dave,



I have not seen a response to your email, so:

You might have a slight amount of crank case fluids due to a leak around the 

area where the actuating arm reaches into the accessory case.

The pump is designed so that if one of the diaphragms fails the leaked fuel 

will exit via the overflow fitting and out the tubing you describe instead 

of running into the crankcase. I probably don't need to tell you that fuel 

getting into the crankcase can be very dangerous. We are talking potentially 

lethal.



It's a total guess on my part that crankcase fluids might be the culprit. I 

am basing this guess on the "dark brown streak" that you describe.

A call to a trusted AME or engine shop might provide some good information.

Others on the list could have good advise.



Let us know how it goes,



Jim



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_________________
"I never make mistreaks"

bicyclop(at)pacbell.net
Guest

Posted: Sun Mar 05, 2006 9:26 pm Post subject: leaking fuel pump overflow

Don't some bushplanes like beavers and such have a system to pump fuel

into the oil to thin it for cold starts? It then boils off as the engine

warms up and the oil becomes viscous again.



Pax,



Ed Holyoke



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khorton01(at)rogers.com
Guest

Posted: Mon Mar 06, 2006 3:04 am Post subject: leaking fuel pump overflow

Yes, but that system only has fuel going into the oil when commanded,  

and they have to follow a specific warm up procedure to be sure all  

the fuel is boiled off before they use high power.  This is  

completely different from a leak in a fuel pump which could put fuel  

into the oil continuously.



Kevin Horton



On 6 Mar 2006, at 24:24, Ed Holyoke wrote:



[quote] 



 Don't some bushplanes like beavers and such have a system to pump fuel

 into the oil to thin it for cold starts? It then boils off as the  

 engine

 warms up and the oil becomes viscous again.



 Pax,



 Ed Holyoke



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davemader(at)bresnan.net
Guest

Posted: Mon Mar 06, 2006 12:41 pm Post subject: leaking fuel pump overflow

Jim

It was my understanding that this overflow would dump fuel overboard

instead of into the crankcase.  So, I guess that the only thing I thought you

would get from this tube would be fuel if the diaphragm leaks.  How would

crankcase fluids get into this tube?....are you saying the diaphragm might'

have a leak or the mating surface between the pump and engine?  I am just

trying to make sense of this since I have never had a fuel pump apart and

can't visualize it.

Dave Mader

On Sun, 5 Mar 2006 20:59:52 -0800

  "Jim Jewell" <jjewell(at)telus.net> wrote:

[quote] 

 

 Hi Dave,

 

 I have not seen a response to your email, so:

 You might have a slight amount of crank case fluids due to a leak around the 

 area where the actuating arm reaches into the accessory case.

 The pump is designed so that if one of the diaphragms fails the leaked fuel 

 will exit via the overflow fitting and out the tubing you describe instead 

 of running into the crankcase. I probably don't need to tell you that fuel 

 getting into the crankcase can be very dangerous. We are talking potentially 

 lethal.

 

 It's a total guess on my part that crankcase fluids might be the culprit. I 

 am basing this guess on the "dark brown streak" that you describe.

 A call to a trusted AME or engine shop might provide some good information.

 Others on the list could have good advise.

 

 Let us know how it goes,

 

 Jim

 

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bicyclop(at)pacbell.net
Guest

Posted: Mon Mar 06, 2006 9:13 pm Post subject: leaking fuel pump overflow

Makes sense,



Ed 



Do not archive



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