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I find it interesting that you get water in the sump on a Velocity. A previous owner of one told me that since the tanks are composite/sandwich structure that water does not condense in the tanks and never got any moisture in the fuel. Where are you getting fuel? Could it have water in it? (they put water in everything now days to "enhance it" or make you pay $4 a pound for it).

Wendell

Fine, but what kind of filters are you using and where are they in the system? Gascolator is NOT a suitable substitute for a filter.
I have a "flat bottomed" sump on my Velocity, and water DOES accumulate in it. My fuel line to the pumps is cheated up off the bottom of the tank half an inch and there's a test drain in the bottom of the sump to check for water. One of these days I'm going to make a little "blister" in the bottom of the sump where water will accumulate so I can get it ALL out without removing the sump and shaking it for twenty minutes.
It all counts, and some of it counts against us ... Jim S.

Paul wrote:
Hi, Wendell....I use the gascolator for a couple of reasons. I cannot check my aluminum sump tank. It is sealed. Since the EFI pumps are located lower than the sump tank, it would be more logical to check for water at the lowest point in the fuel system. The fuel goes from the sump tank to the gascolator, which is the lowest point in the fuel system. I like the gascolator because it has a screen to catch debris that might have found it's way to the EFI pumps, and the gascolator has a fuel drain on the bottom of it so that I can check for water at the lowest point in the system. I don't think the sump would catch the water, as the outlet from the sump is on the bottom of the sump, and water should go right on through the sump tank to the gascolator and EFI pumps, which are the lowest point in the fuel system. I thought this was the best way to design a gravity fed fuel system....everything downhill and a fuel drain at the lowest point. Please correct me if I am in error. Paul looking for a Cessna Conner

----- Original Message -----

From: Wendell Voto

To: Rotary motors in aircraft

Sent: Thursday, February 17, 2005 10:59 AM

Subject: [FlyRotary] Re: Vapor Lock

Paul,

Why use a gasolator if you have a sump tank with the outlet a couple inches off the bottom of the sump? Won't the sump tank catch the water and a strainer stop the big stuff. The sump is checked before each flight and a gasolator isn't. Go straight to the FP then thru a fuel filter and then the fuel rail. Eliminates the restriction, weight and connections to leak. I am beginning to lean towards in-tank pumps with built in strainer since all this has come to light.

Wendell

Hi, Kelly....the efi pumps are the last item before the fuel rail and fuel pressure regulator. Here is the basic system... The fuel in the main tanks goes downhill to the fuel selector. Fuel then goes downhill again through the Facet pump into the top of the sump tank. Fuel then comes out of the bottom of the sump tank through the gascolator into the EFI pump(s), then to the fuel rail with fuel pressure regulator attached, then that returned fuel goes back into the top of the sump tank. That is the complete system. Take care. Paul Conner

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