Quote:
Originally Posted by kerry
He was sucking fuel from the tank with the Mity Vac upstream of the fuel filter so that seems to exclude any problems upstream. Problem must be between the primary fuel filter and the secondary filter. Any chance the primary fuel filter is plugged?
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I do not know how to convert negative bar pressure to inches of Mercury or inches of water but, I recently looked up the vacuum of a Lift Pump for some one. At idle the Lift Pump Vacuum measured at the Pump Inlet is 0.1 bar.
The source I looked at said that 1 bar= 29.61 inches Hg (Mercury)
so a negative 0.1 bar (vacuum) = 2.962 inches Hg
I mention this because I believe the Mity Vac/Vacuum Tester can pulll a lot more Vacuum than the Lift Pump at idle will. This mean that the Mighty Vac might pull Fuel through a restriction better than the Lift Pump.
Also the Lift Pump Vacuum was at Idle speed not at the seed the Starter is turning the Engine at; so there is even less vacuum available at starting speeds.