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It could be anything from a faulty oil pressure gauge, to a mechanic's trick to keep you from finding out the engine is soon to expire. They sometimes unplug the gauge on purpose. Fords can run a little low on oil for a while without signs or problems. I'd start by checking your oil. If it is not low on oil, there is a sensor on the engine block you might want to replace, It should have a wire hooked to it. That is your sensor. If this doesn't work, go to the gauge itself.
Check the pressure sending unit. If that is okay, you will need to use an actual oil pressure guage to determine that the pressure is okay. I believe it should be around 40 PSI, at a high idle (You can find actual specs in a repair manual). Some possible problems are worn oil pump, weak pressure relief valve, or something restricting oil flow. I hope this helps.
I would take the sender out and install a temporary manual gauge (we use a manual SW gauge connected to a 3' length of 1/4" high pressure hose). If the oil pressure is normal on the manual gauge then about the only thing left is the gauge itself.
At this point I would strongly suggest that you have your mechanic hook a mechanical oil pressure guage to the engine and make absolutlely sure that the pressure is up to manufacturers standards. It may simply be a failing oil pressure sending unit, but, until you know, it could turn out a lot more expensive! Thank you, Dana
Hello mb4494: My name is Roger and I will help you. If by changing the oil pressure sending unit the problem did not change. I would perform a oil pressure test. This is done by removing the oil pressure sensor and inserting a oil pressure gauge. This can be done by yourself or by a repair shop. This needs to be done on a cold engine. Start the engine and observe the oil pressure cold.as the engine warms up observe the pressure. The pressure will drop off as the engine warms up.Should the oil pressure drop below 10 to 12 PSI. then you have internal engine trouble. More then likely a bearing problem. Try dropping the truck into gear and see what the pressure drops off to. Again if the pressure drops below 10 to 12 PSI. you have a problem. I would also check to make sure you have the correct oil switch. a truck with a oil light uses a oil pressure switch. with a gauge you would use a oil pressure sending unit. Sorry for the long reply but want to make sure you check the pressure correctly. Please rate the quality of the answer as this is how we know the answer was correct. Thank You for using Fix Ya. Roger
No problem with the oil pressure, the norm is between 40 to 60. Anything lower then 40 you have low oil pressure and anything above 60 then you have high oil pressure which is caused by a blockage in the system.
What is common is the oil pressure gage fluctuating for the first 200 miles if the oil pressure sending unit is getting worn. Good maintenance will keep the engine clean and running good but the oil pressure sending unit is inexpensive and easy to replace. Next time you do an oil change you can have them change the sending unit.
Good luck and hope this helps. You can pick up the sending unit at Auto Zone and most auto parts store and will have the step by step to replacing it. If you do attempt to replace it. make sure you DO NOT USE any Teflon tape or silicon on the threads, they are tapered and need a good ground to the engine for proper readings.
make sure fuel filters are fresh new and installed correctly this will give bad low preasure
the used pump i wouldnt even deal with i would go out and buy the oem part needed brand new it would be like putting used oil back in my truck for an oil change
what would be the point of oil change if your just going to use old oil
on the chassis there should be a fuel pump
in the gas tank there should be a fuel sending unit with filter on it
change the filter out in tank these get debry clogs from bad cheap gas
this you need to drop tank pull out sending unit with filter and replace most people dont realize this at all that the inside tank has to be serviced on a routine schedule every hundred thousand miles this will keep flow good