Need help troubleshooting. 
 New to me 912 UL (late 1990’s Mdl) first start up issues: 


Cyl #3 not firing - EGT around 200* (new ignition modules, per the seller) I haven’t tried to verify spark yet.

No oil PSI - Per my Grand Rapids EIS 4000,  I believe I have a VDO sensor.


Carbs over flowing during fuel priming - standard low psi Facet pump. 

Q’n. Shouldn’t the needle valve be able to stop fuel flow from the aux pump prior to starting engine?


any assistance toward starting point to troubleshoot is greatly appreciated.

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