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Why would there be a substantial oil leak from top rear of the engine?

(1996 Chevrolet 3500 Pickup)
in Crystal River, FL on May 18, 2017
Oil is running down behind the oil filter area and oil pressure guage needle barely moves at all.
Displaying 1 answers & 2 comments
Popular Answer
on May 18, 2017
CHECK OIL LEVEL! ... Have the oil pressure switch checked for leak and test actual oil pressure... Oil pressure switch located near base of distributor - on gasoline engine... Switch leakage is common.

on May 19, 2017
Thanks. It's a 7.4 litre with so much in the way. I've tried to get an inspection mirror in there to look at the darn thing while running, no luck. There is no water in the oil. Should I just go ahead and remove whatever I need, to get to it?
on May 19, 2017
This video I found should be very helpful:

Simply copy and paste the link above, watch video.

▪️Note: First MARK everything that is to be removed so 'YOU' know exactly how it needs to go back!!!
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