recently i have had problems with my oil gauge it jumps down to zero and the check gauges light comes on when ever i come to an complete stop. but there is plenty of oil in it. itdoes not leak oil any wherecan any body help

 

Sounds like either a bad sending unit or oil pump. When the engine is idling, does the gauge just stay at zero, or does it show increasing pressure? When the truck is cruising, what does the gauge show? If it's a bad pump, this is not something to ignore.

 

at idle it sits at about little under 40 at cruising speeds in between 40 and 50 it never sits at zero when im like sitting at a long red light of some sort

 

You haven't said what year your Blazer is, but I'm assuming it's a 1st gen from the catagory of the post. From the info, I would suspect a bad sending unit. Have a manual pressure check done on the oil pressure and see what that says. The pressures you posted look to be well within specs. You're not experiencing any unusual engine sounds are you, like a tapping from the valve train, or deep knocking sound?

 

no not at the time

 

It does sound like a bad sending unit, just to make sure I would test the oil pressure with a pressure gauge at were the sending unit is located!!

 

where is it located at

 

Before we go further, tell us what type of Blazer we're dealing with. Putting your vehicle info into your signature will make it available anytime help is needed.

 

its a 91 4dr blazer with an 4.3 engine

 

The unit should be on the top of the engine at the rear, butif it's like the 2nd gen's, the distributor blocks it, necessitating its removal first.If this is the case, get a Hayne's or Chilton's manual to see how to r&r the distributor.