John,
I would suggest you calibrate your EM-2 fuel pressure sender.  I found that mine was off by quite a bit.  For calibration purposes, I used a kludged manifold, a Victor welding gauge, and my air compressor regulator (for pressure adjustment).  Time well spent.  While you're at it, calibrate the water and oil senders.  Have the welding shop check the accuracy of the Victor gauge before beginning this process.

The air bleed (+/- .020") goes between the fuel pump outlet, and the fuel return line to the tank (bypassing the regulator).  I used a motorcycle carburetor jet and threaded the inside of a -4AN fitting, then screwed the jet into the AN fitting.  Or you could weld it shut and drill a small bleed hole.  I'll look tomorrow to see if I can locate the sketch done on the Subaru site. 

Mark S.

At 04:54 PM 11/18/2004 -0500, you wrote:

Speaking of regulators. I'm a bit puzzled by mine.
Until today I've been using an analog gauge, and have my fuel pressure
adjusted to 35 - 38 psi. Today I hooked up the proper sensor for the EM2. It
reads 56 PSI. The maximum adjustment on the regulator brings it down to 47 /
48. Now the analog gauge reads 30.
Can anyone explain how I tell which is right?

By the way - for Jim - the check valves on Tracy's pumps stop gravity feed,
but I think they'd handle suction from another pump and pass through fine...
but why do that? Parallel is better.

Lastly, about this air bleed thing. How does that work? Running a tank dry
(on the ground) is on my list of tests, but I haven't got to it yet.

John (wondering if 56PSI fuel pressure might explain my mixture problems)


>>  Homepage:  http://www.flyrotary.com/
>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html