Question about 1981 Chevrolet Corvette

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Fuel gauge reads

Why does my fuel gauge read way over full when I turn on the key in my 1981 Corvette?

Posted by Anonymous on

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You have a ground problem at tank or at gage

Posted on Sep 21, 2014

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Posted on Jan 02, 2017

  • 91 Answers

SOURCE: 1999 Monte Carlo fuel gauge stopped working

Hi there. If the fuel gauge is the only one acting up, its probably a loose or corroded wire on top of the gas tank where the fuel pump sets in. It could also be a loose wire on the back of the gauge, which is easier to get to so you could always check that first by popping off the dash pannel and pulling out the instrument cluster and looking for a broke wire on the back of the fuel gauge. But if I had to bet I would guess its on the other end by the fuel pump. Worse case sinario, maybe a bad sending unit.

Posted on Mar 15, 2009

  • 135 Answers

SOURCE: My 2000 Chevy Impala fuel gauge reads empty.

sending unit on fuel pump is bad, the sending unit shorts out gauge will go to empty or full, never read right, turn on switch ,it goes to full or empty, ,check the pump,hope this helps,thanks robert b.

Posted on Jun 28, 2009

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SOURCE: 2 problems.1997 Chevy blazer, OBD2 and fuel gauge wont read

I changed the fuel pump on my 1997 chevy pu. The fuel gauge reads full all of the time. It only has 1/4 of a tank.

Posted on Aug 14, 2009

  • 497 Answers

SOURCE: 2002 Chevy Suburban: Fuel gauge reads empty, tank is half full

Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.

Posted on Aug 27, 2009

emissionwiz
  • 75807 Answers

SOURCE: my 2008 chevy malibu fuel gauge dose not read only

this is caused by a defective gas gage sending unit, the sending unit is part of the fuel pump module inside the gas tank, the gas tank must be removed to replace the fuel pump module that also contains the sending unit.

Posted on May 30, 2010

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1 Answer

1981 corvette anti theft will not arm


Could be the module is fubar since you have B+ at the terminal. U can also install a hidden double pole switch that deactivates the fuel pump and ignition circuits. And if you want to be fancy you can do the same with a relay that opens those circuits automatically when ignition key is removed so you do not even have to throw a switch!

Apr 08, 2017 | 1981 Chevrolet Corvette

1 Answer

70 c10 fuel gauge


You need to check voltage at the gauge on the dash.
They would stop at random places with the key off.
You can disconnect the sending unit in the tank and ground the gauge to test.
Some models read empty with high resistance from the sender, some are opposite depending on the sending unit. The sending unit in the tank is a resistance bar for the ground circuit.

Jul 03, 2012 | Cars & Trucks

1 Answer

Fuel gauge reads full all the time,and we did install a new sending unit with new fuel pump


Dont we wish it be full all the time but gas in it. Okay for the sending unit reading full its getting a full ground reading,Key on engine off. does it move and goe down. It should if it doesnt the problems with the gauge itself. 2 test disconnect the wire harness, did the gauge go down. the problem will be in the sending unit can be a hung float(Rare).

Apr 26, 2011 | 1994 Dodge Caravan

1 Answer

1981 Cadillac with digital displays. The fuel pump was replaced, and since then fuel gauge always reads full. (It was working prior to the replacement fuel pump)


Hello: This could be the fuel level sensor is not connected or the sensor assembly was damaged or bent when assembly was reinstalled or the fuel pump was not installed on the sending unit correctly.

Dec 25, 2010 | Cadillac DeVille Cars & Trucks

2 Answers

The fuel gauge is'nt working.I tryed to ground it


When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.

Apr 17, 2010 | 1991 Chevrolet C1500

1 Answer

2002 monte carlo fuel gauge doesnt work,pump works ok.


It is likely the fuel level sending unit. I had a customer with an 03 Monte Carlo that the pump went out and the fuel gauge hadn't worked in about a year. We replaced the fuel pump module and it took care of both problems. I believe the sending unit is available separately from the complete module.

Jan 10, 2010 | 2002 Chevrolet Monte Carlo

1 Answer

Did the 1981 corvette offer a 230 HP engine or just the 190 HP


Engine Specifications

Type ohv V-8
Displacement, liters/cubic inch
5.7/350 Bore X stroke, inches 4.00 X 3.48 Fuel management
1 X 4-bbl. Horsepower @ rpm
180 @ 4,200
Torque @ rpm, pound-foot
280 @ 1,600
Published Performance Numbers
Acceleration 190 hp, 4-speed manual
0-60 mph, second
8.1
0-100 mph, second
NA

Mar 25, 2009 | 1981 Chevrolet Corvette

2 Answers

Fuel gauge not working all the time.


This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

Feb 18, 2009 | 1983 Mercury Grand Marquis

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