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  #1  
Old 09-22-2019
WanderAggie WanderAggie is offline
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Default Air Bubbles in Rebuilt Racor

We just finished several projects and started the bird for the first time in months. One project was rebuilding the Racor which included a new bowl and all seals. On first start we have bubbles from the Turbine Centrifuge. I have attached a picture. Any chance this is normal and the bubbles will subside? Or should I suspect an air leak prior to the Racor?

Thanks.
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  #2  
Old 09-22-2019
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Bill Pape Bill Pape is offline
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since you had the system open for a time????, it could be trapped air,
look close for a steady stream of bubbles.
Up front do you have the glass water separator and hand pump??? Look there for bubbles
Do you have an electric fuel lift /pusher pump in the read near the tank??
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  #3  
Old 09-22-2019
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giderich giderich is online now
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Default Parker O=Lube

I always use Parker O-Lube on the O rings when rebuilding the Racor

https://ph.parker.com/us/en/parker-o-lube
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  #4  
Old 09-22-2019
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Mike Hohnstein Mike Hohnstein is offline
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If you don't have a pump, get one.
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  #5  
Old 10-06-2019
WanderAggie WanderAggie is offline
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Quote:
Originally Posted by Mike Hohnstein View Post
If you don't have a pump, get one.
Thanks Mike - I have seen the suggestion on many occasions. I am not sure how that will resolve the air bubbles in my Racor.

But, I am working to get it installed. I am installing it in the bay just before the Racor. I have attached pictures below to show placement of the pump and an auxiliary switch. I will tie into the power that previously ran the heater in the racor. Without an entire new housing I can't run the heat anyway. The power is run off ignition power and the auxiliary switch will be used to fill the filter after filter changes.

The other issue I have found - is that it appears the "in" and "out" are reversed on my racor. It should be any easy fix while I am working on the new pump. I am just curious if you have seen this before, and what impact it would have?

Sorry all the pictures came out 90 degrees off...
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  #6  
Old 10-07-2019
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there is a reason for in/out, that would be a problem.
not sure it is possible, but maybe just the bottom housing is reversed.
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  #7  
Old 10-07-2019
Alever Alever is offline
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If the IN and OUT are reversed I would think the check ball inside the Racor would stop the flow of fuel to the engine.
Also if backwards and the flow made it past the check valve the dirty fuel would be flowing from the inside of the filter outward so nothing but clean fuel would be in the bowl at all times and the water and crud would be trapped inside filter until it plugged up.

There is some info out there online about the rubber seal that check ball seats into. One side is tapered and the other is cut square. The taper side goes away from the check ball and the squared side is against the ball. Oh and the check ball is designed to float in diesel fuel. I have had one that sank and didn't work.
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  #8  
Old 4 Weeks Ago
WanderAggie WanderAggie is offline
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Default Seems to be Fixed

So as it turns out, the Racor was not plumbed backward. I questioned how adding an auxillary pump could possibly stop my problem with air in the Racor, but it worked!

Thanks Mike!

I added a Facet Pump right next to the Racor and re-plumbed the lines to and from the Racor. I powered it off the ignition power, which is handy because it just comes on with the key. I also added a switch in the same general area to help with filling the Racor at filter change time.

I am waiting on new adjustable Konis for the front - and then a test drive. Hopefully all this work resolves my power issue.

The attached picture isn't great but you get the idea. The picture is just a screenshot of a video with no bubbles in the Racor.
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