glass fuel bowl observation

Posted by PackardV8 On 2009/6/27 11:40:37

I can't figure this one out. Maybe Owen or HH56 can.

Subject: 56 Executive with legit WCFB and legit cater glass bowl filter. The WCFB bowl vent is adjusted to spec. It is OPEN when engine is off and throttle linkage at rest.

The only thing NOT legit about this set up is the paper element in the oem carter filter unit ala HH56. There is also an 88 Ranger 2.0 fuel filter screwed into the inlet side of the oem cARTER filter unit. OEM gas line from pump to ford filter NOT touching block or any other part of engine enroute.


Here's what happens:

After a long hard run 3hree days ago in 93F degree weather i pull up and stop the car and the engine. IMMEDIATELY get out of the car and lift the hood. Whithin about 2 minutes the nearly full gas level in the glass Carter bowl begins to drop to near empty over a period of about 3 minutes or less. It is obvious to stand there and watch it happen.

Wait about another 3 minutes (I never took my eye from it) and the gas level seems to rise again slowly to about 3/4 full of the glass bowl.

I've thot about this alot. I can't explain it.

WHY does the fuel level in the glass bowl drop???? I do not ever remenber seeing this kind of thing happen before.

Incidently and unrelated to this post, i currently have the main fuel line from tank to pump disconnected and under vaccuum to see how long the vacuum will hold. Just to test the line for leaks.