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Re: [T3] Fuel in oil

Bear with me if any of the following is gibberish.

The mechanical fuel pump is actuated by a cam.
The action of the cam going up would provide the
pressure to force the fuel to flow. The spring
is there simply to push the diaphragm back down
for the next up/pump cycle to follow the cam.
The spring is responsible for drawing fuel into the 
pump, not providing the pressure out to the carbs.

If this is an accurate summary of the action, then
the pressure is a result of the throw of the cam,
not of the strength of the spring. The lengthening
of the spring would be to compensate for the longer
throw of the cam on a T3 versus a T1, not to provide
extra pressure. The lack of an adequate spring might
manifest itself with a slower intake of fuel into
the pump though.

If this is the case, it's not the fuel pump that
is unique, it's the cam driving it.

Perhaps a different diameter diaphragm is the cause
of the different pressure.

I could easily be way off, or just plain ignorant.

Jeff  '67 Sqbk

-----Original Message-----
Once the pump fills the carbs, the pressure should 
not vary with RPM.

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