Google for "Bendix fuel flow divider" and you'll find pages
such as
http://www.dgsupply.com/trouble.html and especially
http://www.precisionairmotive.com/rsasupport.htm

For a full description get FAA AC 65-12A, which is on-line.
Chapter 3 has what you want.




"Robert M. Gary" wrote in message
oups.com...
| My fuel servo is coming back from the shop. I wish I
better understood
| how they work. One day my plane just stated running so
rich that I
| could almost not keep the engine runnnig. I was pulling
about 7GPH at
| 1500 (normal is about 3). However, if I shutdown and
restarted it would
| run correctly about 10% of the time.
| So the fuel shop received it and noticed the FF was too
high. They
| replaced a spring and got the flows in line. However, now
I'm worried
| that they fixed the 90% case and not the 10% case (which
was normal).
| If they replaced a spring with a lighter spring, how would
that solve
| the issue? Why did this happen all of the sudden? Why
isn't it
| consistant? My plane has been down for 3 weeks now and I
fear I'll get
| the unit back and it won't work and I'll be down even
longer (with a
| full FF overhaul). The fuel servo has 900 SFNEW.
|
| Is there an on-line diagram of a fuel servo? I'd like to
better
| understand how the springs, diaphrams, etc work. I'm told
there are
| only a few moving parts, but not sure what they are.
|
| -Robert, M20F
|