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From: "John Slade" <sladerj@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] fuel pump mounting
Date: Tue, 14 Jun 2005 09:29:39 -0400
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Joe,
> If you use the electric fuel pumps like Tracy is using what does the inlet
> side look like (plumbing)?
The original pump that I got from Tracy, was an Walbro Inline fuel
pump-GSL393. This is identical in outward appearance to the Walbro GSL394 I
just replaced it with. The 394 is a slightly higher price model with
slightly better specs. Both models have all metal construction and 1/8 NPT
metal fittings either end. I got mine from Lightning Motorsports.

> Does the pump have any suction on the inlet?
I did an experiment with the pump on a 4 foot bench, and a gas can on the
floor. The pump primed itself with no difficulty. Having said that, a
scenario like this in a plane would be just asking for vapor lock.

> Can the inlet be fed from a tube that goes into a tank close to the bottom
1.5" but is bent
> down in a 90 degree bend? The sump is lower than the tanks and the pumps
would
> be at the level of the bottom of the sump. My concern is how much of a
"hump" in the
> plumbing will the pump tolerate?
My installation has the pumps under the back seat in the cozy IV, just below
the sump tank level with a 90 degree bend between the pump and the tank. So
far, no problems.
Regards,
John