Question about 1985 Nissan 300ZX

3 Answers

Inquiry of 85 300zx analog fuel gauge operation

85 nissan 300zx with analog gauges I just purchased the vehicle and was wondering why there are two needles and two different levels to the fuel gauge. Does the second one (lower) work when the tank is low or something?

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  • hornet0419 Sep 15, 2009

    that kind of makes sense but it goes from zero to one eighth then to one quarter could it be something else. It's a small orange needle

  • hornet0419 Sep 15, 2009

    that kind of makes sense but it goes from zero to one eighth then to one quarter could it be something else. It's a small orange needle

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The secondary activates when you are low on fuel, it shows how far you can go (in miles) before you're out of gas.

Posted on Aug 28, 2013

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Did you ever figure out what this seconadry gauge shows? the needle only shows when Im pretty low on gas. My gas gauge drops to under empty after it gets to about half a tank aswell but I think its broken.

Posted on Sep 20, 2012

  • abc123_922
    abc123_922 Sep 20, 2012

    Did you ever figure out what this seconadry gauge shows? the needle only shows when Im pretty low on gas. My gas gauge drops to under empty after it gets to about half a tank aswell but I think its broken.

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  • Nissan Master
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One is Fuel Level, and the other is Fuel Pressure

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Posted on Sep 14, 2009

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My 98 chevy blazer has a brand new pump and all new wiring to from the the gas tank to the gas gauge but the gas gauge still is reading empty. we are at a loss to what else the issue could be.


Your best bet ,take it to a qualified repair shop ,you have no idea how this works .The fuel level sensor does not go direct to the gauge .
The fuel gauge is an analog device that is located in the IPC. The IPC software operates the fuel gauge by the use of Class 2 messages from the VCM/PCM. The fuel gauge indicates the quantity of fuel in the tank when the ignition switch is in the RUN position.

Apr 15, 2018 | Cars & Trucks

1 Answer

1997 Cadillac Eldorado fuel gauge not reading fuel level correctly


Did you test before replacing ? Do you know how it work's ?

Fuel Level
The body control module (PZM) monitors the fuel level sender input in order to determine the current fuel level. The PZM filters the input and sends a message via the Class 2 serial data line. The IPC receives this message and displays the current fuel level. The fuel level is sent from the PZM to the IPC at changes of 0.5 L (0.02 gal) or on the request of the IPC, with a resolution of 0.04 L (0.01 gal).
• For the digital IPC, when the fuel level is above 18.5 gal, the IPC displays an F. For readings between 18.5-2.5 gal, whole gallon/liter numbers are displayed. When the fuel level reaches 3.0 gal the message FUEL LEVEL LOW is displayed on the driver message center. When the fuel level reaches 2.5 gal, the IPC displays an E. When the fuel level is 1.2 gal or below the IPC displays a flashing E.
• For the analog IPC, when the fuel level is above 18.5 gal, the fuel gauge pointer is on F. When the fuel level is below 2.5 gal the fuel gauge pointer moves to E. When the fuel level is below 3.0 gal the IPC displays a FUEL LEVEL LOW message.
If the updates are not received or a communication error is detected, the IPC performs the following actions:
• For the digital IPC, the fuel gauge is dashed.
• For the analog IPC, the fuel gauge pointer moves to E.

Fuel Gage Inaccurate or Inoperative
Circuit Description
The IPC monitors the fuel level sent by the PZM through the class 2 serial data line. The IPC software controls one of the following two gauge types:
• A digital gauge consisting if a two-digit numeric seven-segment display
• An analog gauge consisting of a needle pointer.
The IPC interpolates and scales the fuel level information that the IPC receives from the PZM.
When you operate the vehicle in diagnostic mode, either in the vehicle diagnostic system or with a scan tool connected, the fuel signal supplied to the IPC is not filtered by the PZM. The unfiltered fuel signal causes the IPC to show real time readings and may be mistaken as an erratic fuel level display.
Diagnostic Aids
Connect a scan tool to the DLC.

Oct 12, 2017 | Cadillac Cars & Trucks

1 Answer

Is there a fuse for the fuel guage


The Fuel gauge is not separately fused, so if the other gauges work that is not the problem.

Jun 22, 2012 | Cars & Trucks

1 Answer

Gas gauge not working


The fuel gauge is operated by the fuel sending unit. The sending unit may be stuck. The temp sensor may also be bad.
First check your fuses.

Jun 19, 2012 | 1994 Nissan Sentra 4-Door

1 Answer

Replace fuel pump and sending unit 1997 cadillac deville. before replacing old unit gauge read low fuel but tank has 4 gal or more. after replacing unit gauges read fill with switch in on protion gauges...


what could be the problem ???? The problem is you tried to fix something you have no clue how it works .... Your best bet , take it to a qualified repair shop. You have no idea of the complexity of these cadillac systems . I know you don't have a $ 5000 dollar factory scan tool or equivalent to diagnose . The sending unit in the fuel tank is a input to the BCM . The BCM sends this info to the instrument cluster over the class 2 serial data network - communication network for the control modules on the vehicle. Fuel Level
The body control module (PZM) monitors the fuel level sender input in order to determine the current fuel level. The PZM filters the input and sends a message via the Class 2 serial data line. The IPC receives this message and displays the current fuel level. The fuel level is sent from the PZM to the IPC at changes of 0.5 L (0.02 gal) or on the request of the IPC, with a resolution of 0.04 L (0.01 gal).
• For the digital IPC, when the fuel level is above 18.5 gal, the IPC displays an F. For readings between 18.5-2.5 gal, whole gallon/liter numbers are displayed. When the fuel level reaches 3.0 gal the message FUEL LEVEL LOW is displayed on the driver message center. When the fuel level reaches 2.5 gal, the IPC displays an E. When the fuel level is 1.2 gal or below the IPC displays a flashing E.
• For the analog IPC, when the fuel level is above 18.5 gal, the fuel gauge pointer is on F. When the fuel level is below 2.5 gal the fuel gauge pointer moves to E. When the fuel level is below 3.0 gal the IPC displays a FUEL LEVEL LOW message.
If the updates are not received or a communication error is detected, the IPC performs the following actions:
• For the digital IPC, the fuel gauge is dashed.
• For the analog IPC, the fuel gauge pointer moves to E.

Fuel Gage Inaccurate or Inoperative
Circuit Description
The IPC monitors the fuel level sent by the PZM through the class 2 serial data line. The IPC software controls one of the following two gauge types:
• A digital gauge consisting if a two-digit numeric seven-segment display
• An analog gauge consisting of a needle pointer.
The IPC interpolates and scales the fuel level information that the IPC receives from the PZM.
When you operate the vehicle in diagnostic mode, either in the vehicle diagnostic system or with a scan tool connected, the fuel signal supplied to the IPC is not filtered by the PZM. The unfiltered fuel signal causes the IPC to show real time readings and may be mistaken as an erratic fuel level display.
Diagnostic Aids
Connect a scan tool to the DLC.
Test for any set DTCs if no DTCs are set current. Refer to System Check in Body Control Module (PZM) Diagnosis.

Your best bet , take your vehicle to a qualified repair shop.

Feb 09, 2018 | 1997 Cadillac DeVille

1 Answer

Gas gauge sticks to full what could be causing this it is a 2000 buick regal


Look for a problem with the fuel level sensor wire or a bad fuel level sensor. It could also be a failure right in the fuel gauge. Your model probably uses a direct metering (analog) gauge*. These have wire-wound resistors inside that sometimes burn out or break. If the low fuel warning light comes on when it's supposed to, then the problem is the gauge itself.

*Some of the newer GM models starting in 2001 have replaced analog gauges with digital circuits using stepper motors to drive the gauge needles, and they've had reliability issues with the stepper motors.

Sep 09, 2011 | 2000 Buick Regal

1 Answer

2006 Nissan Pathfinder SE is registering a code P043: Fuel Level Sensor A Ckt High Input. Dealership diagnosed Service Engine Soon Light as "Fuel Delivery System" needs replaced. Wondering if...


They are the same. The level switch in the sending unit has shorted out. This will not affect the performance of the car. Like you said it only affects the gauge. The switch can't be purchased seperate from the sending unit. Just guessing yours is $400.00 to $500.00. I would live with out it untill the fuel pump went out. Just estimate the mileage with the amount (gallons) you put in.

Jun 28, 2011 | Nissan Pathfinder Cars & Trucks

1 Answer

Fuel sensor is not working properly. fuel gauge only works half the time.


NHTSA 10V075000
Feb 26,2010

Units Effected 80689

Fuel System, Gasoline Storage Aux,Tank

Nissan Is Recalling 2006 thru 2008 Frontier,Exterra and Pathfinder Vehicles
for deformed molded fuel tank,causing fuel gauge to show one quarter tank


Dealer will replace fuel sending unit with modified float arm

Recall to begin March 22,2010



www.nhtsa.gov

Nov 09, 2010 | 2007 Nissan Frontier SE Crew Cab

1 Answer

How to change a fuel pump on a 2005 Nissan


Nissan Car Altima & Sentra 1999-06 Repair Guide
Fuel Pump - Removal & Installation
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Relieve the pressure from the fuel system.
  3. Remove or disconnect the following:
    NOTE When the fuel sending unit needs to be removed, pull the tab upwards. The tab is located on the sending unit, opposite the end of the float. After the tab is pulled, the sending unit will lift straight out of the tank bracket.
    Negative battery cable Rear seat and the access cover Fuel pump electrical connector Fuel lines from the fuel pump assembly Locking ring Fuel gauge assembly Fuel tube and connector from the fuel gauge
    Fuel pump by pinching the 2 locking tabs together. Lift the fuel pump assembly straight upward and out of fuel tank. O-ring and discard
  4. Place a clean rag in the hole to keep out dirt.
To install:
  1. Remove the rag
  2. Install or connect the following:
    NOTE Verify that the mark on the fuel tank and the components are aligned when installing the pump and fuel gauge sending unit.
    New O-ring and fuel pump Electrical connection and fuel tube to the fuel gauge sending unit Fuel sending unit into the tank
  3. If equipped with a threaded lock ring torque the ring to 22-26 ft. lbs. (30-35 Nm). If equipped with a lock ring held by six retaining screws, torque the screws to 18-22 inch lbs. (2-2.5 Nm).
    Fuel lines and fuel pump electrical connector. Always install new clamps on the fuel lines. Negative battery cable
  4. Start the engine, check for leaks and repair if necessary.
    Fuel pump access cover Rear seat

The fuel pump is located in the fuel tank on all vehicles. In-tank fuel pumps are accessible by lifting up the rear seat to gain access to the inspection cover.
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Relieve the fuel system pressure.
  3. Remove or disconnect the following:
    Negative battery cable Rear seat from the vehicle Inspection cover that is located under the rear seat Inlet and outlet fuel lines from the fuel pump assembly Fuel pump and gauge wiring connections 6 mounting bolts that secure the fuel pump assembly to the top of the fuel tank
  4. Raise up the fuel pump assembly and detach the fuel tubes and connector.
    Fuel gauge assembly Fuel pump with the fuel chamber
  5. Pull up the front of the fuel pump chamber and slide the chamber forward.
    Fuel pump from the chamber O-ring seal or gasket
To install:
  1. Install or connect the following:
    Fuel pump to the fuel pump chamber and slide chamber rearward Fuel pump with the fuel pump chamber Fuel gauge assembly using a new O-ring Fuel tubes and connector. Use new hoses and clamps. 6 mounting bolts to the top of the fuel gauge unit and torque the bolts to 18-22 inch lbs. (2-2.5 Nm) Fuel pump and gauge wiring connections New inlet and outlet fuel lines to the fuel pump assembly Negative battery cable
  2. Start the vehicle, check for leaks and repair if necessary. Inspection cover and the rear seat

Hope helps (remember comment and rates this).

Jul 07, 2010 | 2005 Nissan Sentra

2 Answers

My fuel tank almost empty. I filled the tank, but the fuel gauge remained on empty and the SERVICE ENGINE SOON light came on. A few days later, the fuel gauge began working properly again. I took the...


I had the same problem since May with my 2006 Nissan Pathfinder brough it to my dealer 4 times during the course if 3 mos. Then I finally called Nissan Consumer and filed a complaint. Since this was due to a recall that was done to my car, there was no charge. They had to put a whole new fuel gauge sensor. I suggest to take it to a Nissan dealer because there is a recall for Fuel Gauge faulty reading that was put out in March or so 2010, so your car would qualify for the recall at no cost to the customer.

Jun 29, 2010 | 2006 Nissan Pathfinder

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