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Old December 29th, 2017, 12:42   #5
maxmoo
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Join Date: Jan 2011
Location: Lakefield, Ontario, Canada
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Your sending unit/fuel pick-up, that is in your fuel tank, has a very small orifice that can and often will bridge/plug with debris, ice, and/or gelled fuel.
When this happens the vacuum greated by the inj pump trying to suck fuel will cause air to be sucked into the fuel system at the weakest link, usualy the thermo T at the filter. This all happens more easily in cold temps.
See....
https://www.youtube.com/watch?v=yRMTEAKsScE
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