Question about 1991 Chevrolet Cavalier

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I need to wire up my fuel oil amp gauges - 1991 Chevrolet Cavalier

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Im having a problem with my oil gauge on my 91 chev cav z24 3.1 liter 2 door. when i use the gas my oil gauge reads properly or atleast i think so. but when i'm idling at a stop my oil gauge drops and reads as if ther was no oil in in the engine anyone have any answer to why this mit be please im at a loss with this one?????

Posted on Oct 10, 2008

  • spaz_wbi Oct 10, 2008

    and i checked my oil once i get home and it says that it is full on the dip stick im kinda abit worried to drive my car cause it wierd and i dont want to be stranded on the side of a road and comments on this would be a great help thanks all

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How do I repair or replace a defective gas gauge?


It is in the instrument cluster, which has to be removed to replace the gauge. It cannot be repaired. Did you first check the 10 amp METER fuse in the fuse panel?

Now let me say, that when the gauge quits, it is more often a fault in the sending unit in the gas tank, and not the gauge. Here is how to find out if your gauge is good: Find the fuel tank electrical connector, and pull it apart. You will need a small jumper wire. Find the blue wire in the body side of the connector (not the fuel tank side). Put the jumper wire into the blue wire terminal, turn the ignition key to on not start, and ground the jumper wire to a metal frame piece. Someone needs to watch the fuel gauge needle while the wire is grounded. If the gauge in the dash is good, the needle will move. It will probably go to either full or empty, but if the needle moves, the gauge is good and the fault is in the sending unit in the tank. Don't give up testing until you are sure the jumper wire is being grounded good to the frame. Just touch the wire to frame and watch the needle movement, once sure, stop so you don't blow the fuse. If the needle doesn't move, first check the 10 amp meter fuse. If fuse is good, it must be the gauge.

May 30, 2015 | 2000 Kia Sportage

1 Answer

My gas gauge and my oil gauge to my 1990 ramchargerdoes not work?


replace the oil pressure sender first its cheep to buy
the fuel gauge can be hard to fix you need to get a diagram and ground the gauge wire if the fuel lvl gos to full then its the sender in the tank and thats a tank down repair sugjest replacing fuel pump whial in there

Mar 12, 2014 | 1990 Dodge Ramcharger

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I have a 1990 gmc sierra and the gas gauge will only show a quarter tank when it is actually full. What needs replacing and is it difficult


Have to drop fuel tank & replace the sending unit

I would not do that

It is too old for that trouble & expense

Just fill it once a week & keep track of mileage

Mar 13, 2013 | GMC Sierra Cars & Trucks

1 Answer

1978 dodge fuel and oil pressure gauges are


Check the wires to the senders for grounding Those gauges have a power lead to gauge then to sender. The more the sending unit "grounds" the higher the gauge reading

Jun 01, 2010 | 1983 Dodge Pickup

1 Answer

Replaced the fuel pump & main relay. but the


First of all, why do you think it is fuel at all, since it could be the ignition?
Second is that if the car shuts down, how do you know it is not simply a clogged fuel filter?
A bad pressure return regulator can blow out fuel pumps by causing the pressure to be so high the pump over works itself.

I suggest you need better data.
A fuel pressure gauge would be nice.
You could improvise one out of a cheap mechanical oil pressure gauge. You could also run some long thin wires to the fuel pump relay output or even to the pump itself, and hang a little LED off the dash as a temporary diagnostic indicator light.
To catch an intermittent, you need constant data.

Apr 20, 2010 | 1992 Honda Accord

3 Answers

Can anyone enlighten me on what the readings at the fuel pump connection should be for the three wires on the harness? From memory, I think the colors are purple, grey & black w/ white stripe? I was...


It should be four wires. Gray is power to the pump, Purple is gauge control, and two black wires that are ground. You should have battery voltage on the gray for 3 sec. after the key is turned on. Did you replace the plug-in to the pump when you replaced the pump? The pumps usually come with new plugs

Apr 02, 2010 | 1996 Chevrolet Tahoe

1 Answer

Guages on 87 olds cutlass are not working properly. fuel does not work, temperature works but goes strainght to hot as soon as the car warms up, amp gueage discharging oil pressure not working


Hi, you will have to replace all sending units for these gauges in order to restore them to there original state. i will list the sending units and there respective locations below.

1. Fuel gauge sending unit- you will need to replace the fuel sending unit on your Olds. its located inside the actual fuel tank. there's a floater attached to this Assembly and , its broken. you will have to replace the entire assembly. you will also have to drop the fuel tank to access it as well.

2. Temp guage-- normally when this guage starts to malfunction, its because of a bad coolant temperature sensor. Inspect the sensor's wires and connections. ECT (engine coolant temperature) sensor problems are often caused by faulty wiring or loose or corroded connections rather than the failure of the sensor itself. If the wires or connections are bad, replace them. If you think the sensor is defective, it should be tested.

This sensor is located Under hood, center, upper engine area, front of carburetor, passenger side of water outlet, mounted in intake manifold.

3. Amp gauge --- OK, this can be caused by a bad voltage regulator. i would also trace every single wire from the amp gauge to the sensor and regulator. check for corroded connectors and contact clips. replace any wire that may seem worn.

4. Oil pressure gauge-- This gauge will malfunction if the Oil pressure switch is faulty or not working. This is an Information relay unit for the indicator light or gauge on instrument panel. It contains a diaphragm that responds to changes in oil pressure. When the oil level is over a pre-set limit, the diaphragm opens the switch, turning off the light. When level is below the pre-set limit, the dash light comes on. In later model cars, if the oil pressure drops, the switch turns off the fuel pump, to stop the engine and limit damage to internal parts. Oil pressure switches can be grouped into two categories, units for electrical gauges and for mechanical gauges. If this switch is defective, it will have to be replaced. Once replaced, it will fix the dead oil gauge.

This device is located Under the hood, passenger side, front engine area, mounted rear of water pump. If the wires are worn or there is an oil leak near the switch location, replace it.

Inspecting all the above areas and replacing parts if needed, will fix your gauge issues.

Please rate and god bless:)

May 04, 2009 | Pontiac Firebird Cars & Trucks

1 Answer

My 01 bonneville oil pressure gauge is showing 120 and my gas gauge is all over the place


HI, the oil pressure sending unit may be malfunctioning at this point. this will cause erratic readings. if your oil level is proper and there are no apparent oil leaks, you will need to replace the oil pressure sending unit. this will fix the erratic oil pressure readings.

Concerning the gas gauge. this device also has a sending unit that sends the correct fuel level reading to the gas gauge via wire transfer. this sending unit is located and attached to the fuel pump assembly inside the gas tank. replacing this device will fix this issue as well.

Please rate and god bless:)

Apr 28, 2009 | 2001 Pontiac Bonneville

1 Answer

Fuel and oil pressure gauge


hello this sounds like a bad ground to the gauge cluster first thing to try with the key in the on position tap at gauge area see is there any change if not open dash area were gauges are wiggle to see if they are grounded good into dash grab a test light take end put to the ground on one off the gauges touch other power wire with probe while key is in the on position same for both gauges if no difference reinstall you need to check grounds on both gauges by tracing wires it might be easier if you locate your oil sending unit take the wire off attach alligator clip to wire now touch positive side of batterey if it lights grounds okay trace back to units oilsender,sending unit at gas tank goodluck please rate

Sep 19, 2008 | 2000 Buick Park Avenue

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