Question about 1990 Ford F150

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Switching to rear fuel tank

When I switch to the rear tank, the fuel gauge does start to move to indicate fuel in the rear tank but then the vehicle stalls. There is fresh fuel in the tank but the truck will not run when I switch to the rear tank. The switch is good and the fuse is not blown. Is there a pump or some thing that is defective, and if so where is it located. I was told the pump is in the tank, and it will have to be dropped. I hope there is a simpler solution. Thanks. Walt

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  • diverdownscu Mar 01, 2009

    It is a 4x4 5.0 liter. Thanks

  • Frank Simard
    Frank Simard May 11, 2010

    Is this Ford F-150 the 4x2 or the 4x4? Also, what size engine is is? The 4.9L (6 Cylinder), 5.0L (8 Cylinder), or the 5.8L (8 Cylinder)? This information is very crucial to get you that information.

    Thank you for using Fix Ya!



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Go to the following site to view how to remove the fuel pump and install a new one.

  1. Go to THIS SITE
  2. Choose your vehicle year make and model.
  3. Then go to THIS SITE again.
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Hope this helps.

Don't forget to rate the overall satisfaction of this solution.

Posted on Mar 01, 2009

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That is correct the puel pums are located in the tank. Before getting upset check to see if the fuel pump relays are good by swapping them and see if the problem follows. Next select the tank you want to use and listen for the associated fuel pump to come on. I hope this helps. Don,t forget to rate my answer, thanks.

Posted on Mar 01, 2009


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What is wrong - The fuel gauge on my YP125R X-Max is constantly showing full

A constantly full fuel gauge is usually caused by a short circuit on the sensor wire. Check the wiring by isolating the wire as near as possible to the fuel gauge. Measure with an Ohm meter between the wire and earth, the reading should be more than 10 and less than about 200k. A short is indicated by a reading of around 0 Ohms, depending on the accuracy of your meter.
A second possibility is the sender unit in the fuel tank which could be faulty, and then finally, and only finally, the head gauge could be faulty.

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I have a 1992 Mercury Grand Marquis Ls with a fuel gauge that does not work (gauge may be reversed)??? help please.

The fuel level indicating system is a magnetic type system, which consists of the sending unit located in the fuel tank, an anti-slosh module located on the back of the instrument cluster, and a fuel gauge located in the instrument cluster. The sending unit changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge.The pointer position varies proportionately to the current flow. In this system, the sending unit resistance is low (22 ohms) when the fuel level is low and high( 145 ohms) when the fuel level is high. The pointer of the magnetic gauge remains in position when the ignition is turned to the Off position. On some models, an anti-slosh module is used to dampen out fluctuating fuel signals from the sender. Some vehicles are equipped with a low fuel warning indicator. The anti-slosh module will also actuate the low fuel indicator when the fuel level in the tank reaches 1/16 to 1/8 full.

Do your other gauges/warning indicators work properly with the ignition on? If not, check for power at the fuse panel/fuses.

If they do then partially remove your cluster with connector still installed and check for voltage at cluster connector and gauge. Check continuity of cluster and gauge for ground.

Sometimes the anti-slosh module (if installed) goes bad in the Grand Marquis but not likely.

Sender troubleshooting:
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    2. Turn ignition switch to On position.
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    4. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
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    1. Turn ignition to Off position.
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    3. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or above the Full mark.
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Fuel Gauge
The fuel gauge is an analog device that is located in the instrument cluster. The instrument cluster operates the fuel gauge by the class 2 serial data 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. When the ignition switch is turned to the OFF, LOCK, START, or ACC position, the pointer may come to rest at any position.
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The PRNDL display is a class 2 serial data message to the instrument cluster from the PCM/VCM. The PRNDL display is a vacuum florescent (VF) display which displays the fixed gear position of P, R, N, D, 3, 2, 1 surrounded by a moveable square flag in order to indicate the selected gear position. The position of the moveable square flag is sent to the instrument cluster from the transmission range switch over the class 2 serial data line. The transmission range switch and the neutral safety back up (NSBU) switch operate separately but are incorporated into one part. If the vehicle is equipped with a column shift steering column it will also have a park position switch. The park position switch (if equipped) must also be CLOSED in order for the instrument cluster to display the PARK position. Since the system is entirely electronic, there is not any internal adjustment. The PRNDL display will operate as follows:
• The PRNDL display will display the PARK position when a class 2 serial data message is received from the PCM/VCM indicating the transmission is in the PARK position and for vehicles which have a column shift on the steering column, the park position switch must also be CLOSED (low input).
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• The moveable square flag will not appear on the instrument cluster in order to show no gear was selected when the instrument cluster does not receive a class 2 serial data message from the PCM/VCM within 5 seconds of entering the UNLOCK or the RUN position.
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Hooking up a GM tech 2 scan tool an checking for DTC'S - diagnostic trouble code's would be a good first step in the diagnostic procedure .
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Your best bet mite be to take it to a qualified repair shop .

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