2001 chevy express 15 passenger van. No oil pressure. I pulled into my drive way and put my van in park and looked at my gauges when I noticed my oil pressure was reading 0 on my pressure gauge. The van is not leaking any oil. Any help would be appreciated! Thanks

Because revving the motor makes the oil pump spin faster and therefore increases pressure. It should be stable and within specs when you are at cruising speed.

bulbs might be blown

Did you verify oil pressure with an oil pressure gauge besides the one on the instrument cluster?

Hi, try pulling the connector off your oil pressure switch and using a short jumper wire to connect the terminals inside. The switch is on top of the engine behind the distributor. If this works to keep the pressure up, replace the oil pressure switch. You may notice your oil pressure gauge spiking and/or the engine light may illuminate. This is normal with the jumper wire installed. Please let me know if this doesn't work or you have any questions.

Since the oil pressure reads fine when cool or not at idle, the problem is probably the oil pressure sending unit. The easiest way to check is by replacing it, and it is fortunately not an expensive part.
Let's hope that is the correct fix.....
Think about how you noticed the problem....was it a gradual thing, with the gauge reading lower and lower until it was at zero, or one day it suddenly just happened? If it was a sudden thing, the sending unit is the probable cause. If it was gradual, there are several other possibilities, one being the oil pump itself. When an engine warms up, the oil thins, and a worn oil pump cannot deliver as much pressure. This can be fixed for a relatively low cost by a do-it-yourselfer in an afternoon or so, by replacing the oil pump. This requires removing the oil pan, and in some (not all) cases the engine must be unbolted and jacked up enough to allow the oil pan to be removed. A worst case scenario would be if the loss of oil pressure at idle is caused by worn main engine bearings. This would require major engine service.
If you really do not want to put any money into your van and just need it to last a little while longer, if the problem turns out to be main bearings, you can alternatively add an oil thickening agent like "STP" or "Motor Honey" to the oil and thicken it up enough to build up some extra pressure. Please be advised that this is not a "fix", but it will get you a few more miles out of your van in a pinch....eventually the bearings will fail. This will also help a worn oil pump build pressure, but it depends on how worn it is. This about covers "best case", "middle case" and "worst case" scenarios. There are some in-betweens, but unless you have noticed strange engine noises you do not have to worry about them as much.
Stay positive and go for the oil pressure sending unit first!

Very first thing you need to do is install a mechanical pressure gauge on there to verify what you see on your gauge. If the actual pressure is low, then it's time to start looking inside the engine. If not, then you need to trace out the electrical problem but will know the engine is safe.

The oil sending unit located on the top back of the engine is clogged. this will cause high readings.
You should replace it. Until you do it is OK to drive your vehicle. The part is $20 to$30. If you can remove the engine housing in the van, the sending unit will be staring you in the face. It is about 3" long and about 1&1/4 " in diameter at the base. And of course there is wire/wires going to it.
Randy

You need to get the codes from the theft deterrent module.Usually a B2960.This will help in the diagnosis of the problem.Hope this helps.Good luck.

If you are adding anti-freeze every time this happens, you are still loosing coolant some were. I assume there are no puddles on the garage floor or where you park the van? Check the oil dipstick and make sure the oil is not a "milky"color. Check the passenger side carpet for wetness, you may have to pull it back.
If all of that is OK, you are still burning the coolant by way of the intake gasket or head gasket.
Good luck, let me know.
Regards,

it is the head gasket. you're wise to change the oil right away but stop driving it before you do some real damage to the motor.