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1. 02:55 PM - Fuel Pressure (BobbyPaulk@comcast.net)
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Today I determined to find out what caused the fuel pressure drop. I shut off the
fuel valve and drained only about 2 tablespoons full of fuel out of the gascolator
- which I thought a little odd. When I removed the gascolator it was full
of fuel. The quick drain was partly plugged but nothing that I could see that
would cause that - only a few tiny grit particles that I picked up with a
white rag. I then removed the gasket and screen and got fuel running down my elbow
from downstream of the gascolator. I wondered why it did not drain back thru
the stainless steel screen. I looked carefully at the screen in daylight and
saw it was about 80% blocked with a transparent goop that a degreaser had little
effect on. I cleaned it further with soap and water but finally blew it
back from the direction of flow and could see small particles flying off the screen
as the air nozzle hit it. I continued all around the screen until it was
clean.
I re-installed the screen and gascolator and ran up really good on both tanks and
then test flew.
My fuel pressure was back where it was and only dropped a little at full throttle
but never below 2.2 psi.
I believe the residue to be a left over of evaporated Ethanol fuel that had been
in my grandson's 5 gal. gas can for his Jon boat for over a year. I saw the
goop in the bottom of the can and rinsed it. Thinking that was sufficient. It
was not. My engine failed after putting the 5 gal. of fresh fuel in the left tank
back in December. Luckily it quit on taxi out and I found out what it was.
I cleaned and drained the tanks several times and thought I had it all out. Apparently
it was enough residue to gradually coat the fine strainer in the gascolator.
I will watch closely and clean regularly for the next few months to see if it returns.
Thanks Again for all the helpful inputs
Bobby ( age 74 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 285 Needle Jet
Status - Flying 154 hrs.
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