Air leak / backfeed the system to find

[smquandt]

Finally got my '93 PT-40 home, we had to widen the drive a little,
well OK LOTS, to do so. Now comes some work. There is an air leak
someplace that I need to find. I really do not want to run the
engine to re-pressure the system. I have a large compressor in my
shop with a 60 gallon tank and max pressure of 140 PSI. If I set
the outflow pressure on the compressor to 100# and hook a line up to
the air connection in the bay is there any reason that I cannot back
feed the system? I would keep the outflow valve on the compressor
at less than 1/2 open to reduce the volume.

I see emergency vehicles that are hooked up to back feed in most
fire stations.

Thanks in advance for help for the new owner, many nore questions to
follow.

Steve Quandt
Spread Eagle WI / Iron Mountain MI
1993 PT-40