Fuel gauge, oil pressure gauge, engine light

Tiny
REMPELFAMILY03
  • MEMBER
  • 1991 CHEVROLET BERETTA
  • 3.1L
  • V6
  • FWD
  • AUTOMATIC
  • 70,643 MILES
"My fuel gauge in my 91 beretta GTZ says it's half full no matter how much fuel I put in. I just replaced the fuel pump along with the fuel float. Before I did that it was reading full but there was no float, and my oil pressure gauge goes up beyond max when I step on the gas, it's like it is attached to the tach, also my engine comes on once in a while, only after the car has warmed up to running temp. And it doesn't stay on. It shuts off after a bit. What could my issues be?
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Tuesday, January 14th, 2014 AT 8:33 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
With a missing float, your fuel gauge will read "full". GM has always used a different style gauge than everyone else. As the float drops, the sending unit electrically pulls the gauge needle down. Most likely the new float got hung up on a baffle in the tank. You can verify that by unplugging the sending unit wire. The gauge should go to "full" again.

For the oil pressure problem, start by removing the sending unit to install a mechanical pressure gauge so you can see what the actual pressure is. If it really is too high, suspect blockage in the pressure relief valve in the oil pump. That commonly results in exploding the oil filter.

When the Engine Computer detects a problem, it sets a diagnostic fault code and turns the Check Engine light on to tell you. Chrysler makes reading those codes yourself real easy. It's almost as easy on your car but you have to find the diagnostic connector under the steering column. Use a paper clip or piece of wire to connect terminals "A" and "B" together. Those will be the only two terminals right next to each other in one corner of the plug. Turn on the ignition switch and watch the codes flash out with the Check Engine light. Count the flashes for the first digit, there will be a short pause, then count the flashes for the second digit. After a longer pause additional codes will flash the same way if there are any.
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Tuesday, January 14th, 2014 AT 9:51 PM
Tiny
REMPELFAMILY03
  • MEMBER
The oil pressure gauge is moving just like the tach. Step on the gas and it goes up, let off the gas and it goes down. As for the float, it does go back to full when I unplug it, but if it's hung up would it not get unhung if I fill up the tank?
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Wednesday, January 15th, 2014 AT 5:15 PM
Tiny
CARADIODOC
  • EXPERT
Nope. When it's hung up, it's stuck on something and it won't move when the fuel level changes. The float arm could be rubbing on the side of the tank or be hooked on an internal baffle. I've had wires stick out when they should have been tucked into a slot, and hold the arm from moving past a certain point, either up or down. On some designs the entire arm can be flipped over 180 degrees. That will break the connection to the movable contact. Instead of floating on the gas, the arm can get bent the wrong way as the pump is forced down into the tank. Some arms just wrap the heavy rod around the plastic float to hold it, and on those, the float could pop out from rough handling.
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Wednesday, January 15th, 2014 AT 7:11 PM

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