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You need a dedicated make up (combustion air) to replace the air you are throwing out after combustion.
As you have already realized, your house is going negative (pressure) with regards to the outdoor and every little leak that exists is letting in air to compensate for the difference in pressure.
A combustion air is usually "trapped" so that the cold air doesn't just spill onto the floor of your utility room. That is, the outlet of the combustion air duct has to fill up a bucket and when the heater is in use that bucket flows air over the rim to provide air for combustion.
Think of it like a trap for a sink or a toilet...
Does that make sense?
Once you have provided a source for combustion air, your air leaks through the outlets should decrease.
It is still a good idea to seal all the other leaks.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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