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Hi,
I have a 1995 Ford E 150 High top conversion van with a 351 engine and 132,000 miles. My friend was digging up a 6-7 inch tree stump but couldn't get it out. So my van has a class III hitch and I figured we could pull it right out. So it was wiggling and we hooked up and I pulled until the wheels spun out. To make a long story short, we tried this several times until we dug and cut enough roots and finally got it out. When I was driving home, the oil pressure would go to zero when I was at a complete stop, but normal as soon as you hit the gas. All the other gauges were fine. So my question is: Did I blow out my oil pump and what will happen if I don't fix it right away?
First you want to check the sender to be sure its not just a bad pressure sensor. However, if its not the sender and you actually do have a pressure problem its not likely the pump. After such effort I would tend to think you may have damaged the crankshaft bearings and that is your problem.
Ive done this kind of rowdy activity as well with no bad results other then some whip lash. Im guessing its a coincidence & the sending unit for the gauge went south. replace it its easy. I would guess the dog house needs to come off to get at it on some Vans as I remember.
Your oil pressure sending unit is near the oil filter, just above it. No need to remove the dog house or even open the hood.
The gauges in the vans of that era are not true reading gauges. Even when they are working correctly they work more like an idiot light than a gauge.
I would recommend that you remove the sending unit and temporarily replace it with a test gauge. This is a gauge on a hose with a brass fitting that threads in where the sending unit normally goes. Once it is installed, crank the engine and check the pressure to be sure what the actual pressure is.
You may be able to borrow one from a friend or you can buy a test gauge fairly cheap at an auto parts store. Auto zone may have one in their tool loaner program.
If the pressure is actually within spec then the problem is likely the sending unit but the voltage regulator in the instrument clusters have caused gauge problems for other posters in the past. Could also be wiring as mentioned before.
The sensor comes in 2 versions. One is a pressure switch that puts the needle midrange whenever there's more than the minimum pressure. That is the stock for many years. The other is an actual gauge sender that will vary the needle position with pressure. That's what most of the auto parts stores will carry, make sure you get that one.