<VV> RE: U can unleaded a vair to gas but Can't make it drunk

[Tony Underwood]

>-----Original Message-----
>  Hey All,
>After tightening the cap of the fuel pump and pour gas through a funnel into
>the inlet it didn't leak. But I'm still not getting gas to the carbs.  I am
>beginning to think it's an under the pump thingy.  I may be using the wrong
>wordage so bare with me.  The thing I'm gonna call a push rod (yeah that
>sounds right to me) went up one time and stayed there when the engine is
>cranked.  

It will do this without a fuel pump to put pressure on the pushrod and keep
it on the crankshaft eccentric that moves it.    


>Is that the way this thingy is suppose to work or would it be
>moving up & down continuously?    

It does when the pump is in place.   There's a sizeable spring inside the
fuel pump that applies pressure against that pushrod.    

>I seem to be yet again at a road block.  My
>fuel lines from the pump to the carbs are clear (remember I broke the old
>set) and I ran a hose from the inlet to a gas can (8" line with hose
>attached...clear) and still nothing. Suggestion, comments & mechanics that
>work for food welcome.


Has anyone suggested that...  

A:    Maybe the wrong pushrod/pump combo might be going on here?  This will
only apply if the pump has been replaced before and/or someone has been
doing work on the engine, perhaps swapping some parts around...    Earlier
variants of pushrods and pumps had different lengths and you can't mix and
match the early-early pumps with late pushrods or vice versa.   

B.   Is the fuel pump fully seated correctly so that the clinch bolt that
secures the pump in place is actually seated into its dimple?    Look at
the pump shaft and you'll see the dimple into which the securing bolt fits.
   If the pump isn't positioned correctly the bolt won't reach the dimple
and the pump position won't be correct... and proper pump operation depends
upon the pump securing bolt being fitted correctly... otherwise the pump
may do nothing at all if it's mounted too high, or it may bind up and break
something inside if it's mounted too low... depending on where the
crankshaft eccentric happens to be when the pump is installed.    


One sure-fire way to confirm that the pump is actually mechanically
functioning (although not necessarily actually pumping fuel) is to insert a
length of coathanger wire (or anything stiff that will actually fit through
the hole) into the top vent hole of the pump until it bottoms out against
the top diaphragm inside the pump and have someone crank the engine while
watching that length of wire.   The wire should bob up and down as the top
diaphragm of the pump cycles.     You need not worry about the wire harming
the diaphragm because it has a steel disk covering the top to support that
diaphragm spring I mentioned earlier.         




tony..