Question about 1990 Ford F150

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Dual tank only runs on one tank

It has 2 gas tanks the one in the front is the only one it runs on and the fuel level gage doesnt work on that tank however when i turn the switch to the rear tank the fuel level gage works but the engine stall lack of fuel i guess. and als theres some kind of pressure on the rear tank because when you loosen the gas cap fuel alot comes out i could use some help

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  • Ford Master
  • 4,369 Answers

There is an electric valve that switches from one tank to the other. it switches the gauge too. It is malfunctioning and pumping fuel from one tank to the other instead of the engine. I think there wa a recall for this. Call any Ford dealer and give him your 17 digit VIN # and they can check for open recalls. Recalls never expire and the dealer will repair for free if there is a recall.
good luck

Posted on Jan 11, 2009

  • gerry bissi Jan 11, 2009

    89S70 - Safety Recall - 1990 F-150/250/350 with Dual Fuel Tanks
    (Published: 09/1989)



    Affected Vehicles

    Certain 1990 F-Series light trucks equipped with dual fuel tanks built from July 24 thru August 1, 1989 at the Michigan Truck Plant.
    Reasons For Recall

    The fuel line assembly connectors (fuel supply and return line) on a small number of these trucks may be crossed. If this condition exists, there is a potential to transfer fuel from one tank to the other possibly resulting in fuel overflow and spillage during engine operation. In the presence of an ignition source, a vehicle fire could occur.



    Parts Requirements

    Parts will not be direct shipped for this recall. Order your parts requirements through normal order processing channels.








    SERVICE PART NUMBER
    DESCRIPTION
    APPLICATION
    CLASS

    F0TZ-9S278-B
    Fuel Line Assembly
    117"/139" Wheel Base
    CG

    F0TZ-9S278-C
    Fuel Line Assembly
    133"/155" Wheel Base
    CG

    F0TZ-9S278-D
    Fuel Line Assembly
    137" Wheel Base
    CG

    F0TZ-9S278-E
    Fuel Line Assembly
    161" Wheel Base
    CG





    Inspection/Replace Fuel Line Assembly


    1. Be certain that there is fuel in each tank.
    2. Start the engine and run for two minutes using aft-axle fuel tank.
    3. Repeat using mid-ship fuel tank.
    4. If the engine fails to continue running on either tank, replace fuel line assembly. (Reference Shop Manual, Section 24-50 for procedure)
    5. CAUTION: Be sure all fuel line routing clips on the new fuel line assembly are secure to the frame side rail and rear tank cross member.
    6. Check entire fuel system for leaks.
    7. Complete Form 1864 and release truck from delivery hold.

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My gas gauge in my 2002 Pontiac Bonnivile shows empty all the time


Fuel Gauge Troubleshooting

Fuel Gage
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the CHECK GAGES indicator illuminates.
DTC P0462
The fuel level sensor changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine fuel level. When the fuel tank is full, the sensor resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sensor resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel (%) in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the IPC in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics
DTC P0463 (3.8L)

How to test fuel gauge tank sending unit P0463 GM

Mar 29, 2017 | 2002 Pontiac Bonneville

2 Answers

02 blazer LS zr2 gas gauge when i turn the key the needle goes all the way to full then when i start the car it bounces a little between 1/2 and full and when im in drive is slowly comes down but is not...


Fuel Gage
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.

Hooking up a professional or factory scanner an checking input data to the PCM from the sending unit inside the fuel tank ,viewing the information sent to the IPC , Checking for diagnostic trouble code's .
DTC P0461
DTC P0462
Circuit Description
The fuel level sender changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sender resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percentage in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

Install a scan tool.
Turn the ignition ON, with the engine OFF.
With a scan tool, observe the Fuel Tank Level Remaining parameter in the PCM data list.
Does the scan tool indicate that the Fuel Tank Level Remaining parameter is less than the specified value?
1%

No DTC'S - diagnostic trouble code's stored ,use this diagnostic procedure
Fuel Gage Inaccurate or Inoperative
• Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings. The Fuel Tank Level Remaining parameter is available in the scan tool in the PCM data list.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level sensor.
DTCs will be set in the PCM when you perform this diagnostic table.
Step
Action
Value(s)
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Instrument Cluster Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
2
Disconnect C104.
Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side.
Turn the ignition ON, with the engine OFF.
Important: Verify the J 33431-C resistance settings with a DMM.
Vary the resistance on the J 33431-C from 40-250 ohms.
Refer to Fuel Level Specifications in order to convert from resistance to fuel gage display.
Does the fuel gage display the correct fuel level?

How to test fuel gauge tank sending unit P0463 GM

Dec 19, 2017 | Cars & Trucks

1 Answer

GAS GAGE


This problem is caused by a defective fuel level sending unit inside the fuel tank. The gas tank must be removed to replace the fuel level sending unit.

Feb 08, 2012 | 2001 Isuzu Rodeo

2 Answers

It doesnt register the gas level either its always full or empty.


There is a float in your gas tank, it is probably broken. This is the part that reads the level of gas in your tank. Probably an expensive fix.

Apr 03, 2011 | Buick Century Cars & Trucks

1 Answer

1990 f250 5.0 dual tank , truck starts running bad , backfire & quits running alltogether after the gas tank gets below half way mark also seems to be more of a problem on an up hill grade . Have...


Backfiring is not going to have anything to do with the level of fuel in the tank. You most likely have burned valves or broken valve springs in your engine. I would do a compression test.

Mar 26, 2011 | 1990 Ford F250

2 Answers

1992 f-150 dual gas tanks tank closest to cab of truck pumps gas out the fuel cap


A FORD EQUIPED WITH DUAL TANKS THIS YEAR MODEL HAS CHECK VALVES IN THE FUEL PUMPS .THE FUEL RUNS FROM THE REAR TANK WHEN IT IS POWERED ON TO A TEE AND INTO THE SAME LINE AS THE FRONT PUMP . THE PROBLEM IS AT THE BOTTOM OF THE FRONT FUEL PUMP THERE IS A CHECK VALVE ON THE FOOT AND IT IS NOT WORKING.WHILE THE TRUCK IS RUNNING WITH THE REAR FUEL PUMP ON IT IS PUMPING FUEL INTO THE FRONT TANK . IT WILL RUN OUT OF THE NECK WHEN IT IS FULL.THE FIX IS SIMPLE REPLACE THE FRONT FUEL PUMP. THEY DONT MAKE A CHECK VALVE REPLACEMENT I CHECKED I HAD THE SAME PROBLEM AS YOU.

Jun 02, 2009 | 1992 Ford F150 SuperCab

2 Answers

I have a 94 chevy s10 and my gas reads empty while i drive.but when i shut off the truck the gauge moves to different readings.


Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?

If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
1st. know there is gas - 1/2 tank works best.
2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

Dave

Feb 28, 2009 | 1996 GMC Sonoma

1 Answer

Fuel level sensor in tank bad????


Yes it is all one unit, and yes that is what the problem is. don't use aftermarket parts, use OEM, (Delco Remy) they are much better quality.

Sep 08, 2008 | 2000 Chevrolet Blazer

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