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My oil pressure gauge dropped to none I replaced oil pump and still have the same problem

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Look for a sending unit it should be on the side of the block,(eng.)

Posted on Apr 05, 2011

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Oil pump ford explorer


No that is not the pump that you smell. You need to have a test gauge hooked up to verify that you have good oil pressure, if it is ok then replace the sending unit for the oil pressure gauge.

Mar 20, 2014 | Ford Explorer Sport Cars & Trucks

1 Answer

1993 chevy pickup z 71 driving down interstate and check gauge light came on and oil presure dropped to 0. Truck died and cant start again


It could be the oil pressure sending unit, or the engine could really have no oil pressure.
If the oil pressure dropped to zero at highway speed, I would expect the engine to lock up or at least make alot of noise.
You may have to tow it home and check the oil pressure with a mechanical gauge, or replace the sending unit to see if the gauge on the dash reads pressure.
The fuel pump gets power from the pump relay at startup, then runs off power from that oil sending unit when the engine is running.

Dec 19, 2012 | Cars & Trucks

2 Answers

How can i fix the oil pump


see this tips and fix it. God bless you
The oil pump supplies oil to lubricate your engine. If the oil pump is worn or is not turning, the engine will suffer a loss of oil pressure, which may result in engine damage or engine failure.
The first sign of trouble may be a low oil pressure warning light, a drop in the normal reading on you oil pressure gauge (if your car has one), or the appearance of ticking or clattering sounds from your engine.
As a rule, most engines only need about 10 PSI of oil pressure for every 1,000 RPM of engine speed. Oil pressure will read higher than normal when a cold engine is first started because the oil is thick. Oil pressure will gradually drop as the engine warms up and the oil thins out. So normal oil pressure on a warm engine cruising down the highway is typically 30 PSI up to 45 PSI.
SYMPTOMS OF OIL PUMP TROUBLE
The first thing you should do if any of these symptoms occur is to stop your car, turn off the engine, let it sit for a few minutes, then check the oil level on the dipstick. If the oil level is at or below the ADD line, add a quart of oil to bring the level back up to the full mark. Add as much oil as is needed to raise the level to the full mark. Then restart the engine. If the warning light remains on, or the oil pressure reading does not climb back up to its normal range, or the engine noise does not go away, you may have a bad oil pump.
The other possibilities include a bad oil pressure sending unit, or a problem with the oil pressure warning light circuit or oil pressure gauge.
OIL PRESSURE SENDING UNIT
If the engine is NOT making any unusual noises and seems to be running normally, and the oil level on the dipstick is FULL, but you are still getting a low oil pressure warning light or low gauge reading, the fault could be a bad oil pressure sending unit.
The oil pressure sending unit is mounted on the engine block. On some applications, there is a spring-loaded pressure-sensitive diaphragm with a switch inside the sending unit. This switch completes the circuit to the low oil pressure warning light if oil pressure drops below a certain threshold. The unit may stop working if the diaphragm inside fails, if the switch is stuck, if the small hole that allows oil to enter the sending unit becomes plugged, if there is a loose, corroded or broken wiring connector at the sending unit, or there is a fault in the wiring circuit between the sending unit and warming light.
On vehicles that have an oil pressure gauge (electronic, not mechanical), the oil pressure sending unit has a small rheostat inside that sends a variable voltage signal to the oil pressure gauge when the diaphragm moves. A worn spot on the rheostat or any of the other problems just described for the simple pressure-type oil pressure switches can cause a problem.
FORD'S FAKE OIL PRESSURE GAUGE
On many Ford vehicles that were built from 1980 through the 1990s, the oil pressure sending unit has two switches, a low pressure and a high pressure. These vehicles also have an oil pressure gauge, but the reading on the gauge is not a true indication of real oil pressure. As long as the pressure to the sending unit is between high and low, the gauge will read normal. If oil pressure drops and trips the low pressure switch, the dash gauge will now read low. Or, if oil pressure goes up and trips the high switch inside the sending unit, the dash gauge will read high. Consequently, don't rely on the oil pressure gauge for an accurate reading in these vehicles. It is only a gross indication if the oil pressure is low, normal or high.
OIL GAUGE PROBLEMS
If the engine is NOT making any unusual noises and seems to be running normally, the oil level on the dipstick is FULL, and you have replaced the oil pressure sending unit but are still getting a low oil pressure reading on the dash gauge, the fault could be in the wiring circuit between the sending unit and gauge, or the gauge itself might be bad.
Check the wiring connections on both ends as well as wiring continuity between the sending unit and gauge. If no wiring faults are found, hook up a pressure gauge directly to the oil pressure port on the engine and check oil pressure with the engine running. If the engine-mounted gauge shows normal oil pressure but the dash gauge is reading low, the problem is a bad dash gauge.
On the other hand, if the engine-mounted pressure gauge reads low and you have done all of the above, chances are the oil pump is worn, or it is not picking up enough oil because of a restriction or blockage in the pickup screen in the bottom of the crankcase.
OIL PUMP PICKUP PROBLEMS
The pickup tube has a screen on the end to prevent large chunks of anything bad that ends up in the crankcase from being sucked into the pump. But we are talking BIG chunks of debris, not normal wear particles or carbon or dust or other microscopic-sized abrasive particles that can cause pump wear over time.

Sep 28, 2012 | 1996 Toyota Tercel

3 Answers

Oil pressure drop with engine getting hot


You'll want to remove the electrical oil pressure gauge and check the oil pressure with a manual gauge to verify low oil pressure. If the oil pressure tests good with a manual gauge, then you either have a faulty oil pressure sender, or gauge in the dash (I rarely see faulty gauges). If the pressure is still low, suspect worn crankshaft bearings. There is also a possiblity that the screen to the oil pump is clogged. This can be visually checked by removing the oil pan and cleaned.

Aug 14, 2012 | 1989 Ford Ranger

1 Answer

1995 Ford Econoline 150 with 302 engine. Oil pressure indicator starting dropping when idle speed went down, Had a new oil pump and sending unit replaced, still does the same thing. Has 190K on it, now as...


When you had the pump replaced did anyone look at the rod and main bearings? 99% of all low oil pressure problems I've seen has been directly related to bearing wear, not a bad oil pump.
Replacing the pump will give you slightly better pressure temporarily but that won't last very long.
Verify the actual oil pressure using an external mechanical gauge. If it's low (likely it is) go back into the oil pan and use plasti-gage on the bearings to measure clearances.
In reality though, in an engine with that many miles, it's best to either completely rebuild or replace it though.

Sep 10, 2011 | 1995 Ford Econoline

3 Answers

What would cause a drop in oil pressure without any visible leak


the pressure bypass valve in the oil pump leaking by and not closing completely to make the pump build full pressure,or the pump is working and the sending unit is giving you a false reading,then you should have a mechanic put on a gauge to see actual pressure of the pump,don't wait cause if pressure is actually that low you will sustain engine damage soon

Apr 02, 2010 | 1998 Chevrolet S-10 Pickup

2 Answers

Oil gauge drops all the way down and check gauge light comes on


Could be the oil pressure sender has gone bad or worse case scenario the oil pump has worn out. Check the oil presssure sender first, if it is leaking around it then that is the cause, if not then you may be looking at an oil pump. Just had a 03 ram 2500 doing the same thing and it was the sender, but that was a hemi and it had 230000 miles and a month later had to replace the oil pump for same issue.

Mar 17, 2010 | 1999 Dodge Durango

2 Answers

I have low oil pressure in my 1994 chevrolet suburban


start by testing your oil pressure sensor, and then if not that drop your oil pan and the screen on your oil pump tube may be restricted. or change the oil pump could be weak

Jan 23, 2009 | 1994 Chevrolet Suburban

2 Answers

Fluctuation on the oil pressure gauge reading


The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.

The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.

If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.

If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.

Nov 24, 2008 | 2003 Toyota Sequoia

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