Stiff Plunger in Fuel Distributor

[Jesse A Clendenning]

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[ Picked text/plain from multipart/alternative ]

As I am still at work and do not have this problem - as of yet, I was think=
ing... I've read a couple of posts about stiff control plungers in the fuel=
 distributor and have experienced it once myself on an old 5000s. Most peop=
le assume that it is a result of the fuel pump running in an "overpressuriz=
ation mode." After thinking about this I believe that maybe this could be j=
ust the opposite. The difference between the pressure on top of the distrib=
utor and on the bottom of the distributor are what causes the pressure on t=
he plunger, correct? If there was excessive pressure on the bottom of the f=
uel distributor, wouldn't the plunger be easier to lift? Now if the pressur=
e were low from a failing fuel pump - then pressure would be as high as pos=
sible on the top side of the fuel distributor, and greatly reduced on botto=
m side - making a stiff plunger.  In the Bentley it describes cold control =
pressure (on top of fuel distributor) as being less than warm, making the p=
lunger move easier.  Does this seem to coincide with your theories? or am I=
 flawed in my views? I want to understand this better. Thanks, Jesse Clende=
nning

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