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R. Hankins
Joined: 18 Jan 2006
Posts: 185
Location: Grants Pass, Oregon
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 Posted: Sat Jun 16, 2007 10:02 pm Post subject: Re: 503 fuel pump weep hole makes a mess |
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| Quote: | I think the leaked fuel is black because it is the condensate rotax speaks of and thus requires the weep hole in aircraft fuel pumps. I think it is black because it is mostly oil. I think the fuel/oil is able to work its way up to the pump because of the weep hole.
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Tom,
As of today I have 423.6 hrs on my 503 with the original pulse pump. My plane is in dire need of a bath. Every drop of oil and fuel that has touched the fabric in the last few months shows up as a dark spot that has collected bugs, dust and grime. The weep hole on my fuel pump is clean as the wind driven snow. I have never seen anthing come out of that weep hole and my fuel pump is mounted a good six inches below the engine. Don't be too quick to think it is normal. Do you know someone who is running a similar pump that is not oozing. Could you talk them into letting you install their pump on your plane for an hour or so? This would sure make it easy to tell if it is simply the pump or something with the hose or engine. If you bribe them with some cold suds, you might even convince them to actually swap pumps with you. This would really clear things up in a hurry.
Hang in there, you will find the problem.
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Roger in Oregon
1992 KXP 503 - N1782C |
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Sun Jun 17, 2007 5:44 am Post subject: Re: 503 fuel pump weep hole makes a mess |
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Okay I think You may have isolated the cause of the weep leak Jerb and others. The length of the pulse hose...and the material to some extent...is softening the pulses which allows the condensate to enter the hose.
I just got a reply on the Kitfox list from a fellow with the same installation who had the same problem. His was cured by moving the pump to the front...PTO...end of the engine as suggested by a Rotax tech.
The 503 pulse port is on the PTO end of the engine. The port is on the Mag end on a 582. The old Skystar manual instructs to mount the pump on the fire wall. This works fine with the 582 because the pulse port is close.
The common component of those that don't leak is a short pulse line. The common component of the two I know of that leaked is the long pulse line.
Thanks for all the suggestions from everyone here!!! I have a few mods to make now.
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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Tue Jun 19, 2007 12:07 pm Post subject: Re: 503 fuel pump weep hole makes a mess. Update, Fixed |
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I moved the pulse pump from the fire wall to the motor mount under the carbs. I replaced the 22 inch rubber pulse line with 11 inches of clear urathane pulse line. I ran the engine for about 20 minutes on the ground this morning and no sign of the leak at the punp weep hole. I then flew for 2.2 hours and still no leak. I would have never figured this out with out the list help as the original installation was according to both the kitfox construction manual and my Rotax engine installation manual.
Thanks everyone!!!
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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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