Gas Gauge Not Working

[6.9_Idi]

Fuel Gauge Not Working

Hello everyone, my front fuel tank gauge does not work at all and when I switch to the rear tank the gauge works until I get down to 3/4 of a tank and then it stops working. Do any of you know what might be wrong?

 

[IDIoit]

1) your FSV is bad.

2) the coils on the sender need a good pencil eraser cleaning.

 

[6.9_Idi]

Okay thanks!

 

[79jasper]

* Fuel gauge.

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[OLDBULL8]

Here is the gauge circuit.
The rear tank has the pickup screen fallen off or disintegrated (commonly know as the shower head). Available from a Ford Dealer or Ebay.

You probably have pieces of rubber from the pickup screen in the FSV (Fuel Selector Valve), it's mounted on the frame rail under the drivers seat.

Typical fuel gauge sender.

 

[hesutton]

The two most common issues are worn boards on the sending units themselves and fuel getting into and sinking the floats on the sending units. The floats can be replaced, the boards can't (at least I've never seen boards for sale). Pull the senders and see if fuel is in the floats. Move the arm up and down and have someone watch the gauge in the cab. If the gauge moves as it should, your boards are fine. If not, look for senders.

The FSV can be an issue too, but you usually get other symptoms (like tanks not switching appropriately).

Heath

 

[riotwarrior]

We dont have gas tanks or guages....notice...diesel fuel only....it is a fuel tank a d fuel guage....also throttle pedal not gas pedal

 

[6.9_Idi]

Thank's for all of the help I am hoping to fix the FUEL GAUGE this weekend along with my windows and wipers.

 

[79jasper]

Can I ask what does actually work on your truck? oke:

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[6.9_Idi]

Good question so I recently got my truck and most of the electrical components do not work for example: wipers (got a new switch), windows (switching to cranks), fuel gunge (diagnosing), dome light (have to rewire), and horn (have to rewire). Luckily it is a really mechanically sound truck I just drove 400 miles in it yesterday without a single problem. The wiring got all messed up because the kid who owned it before me cut all the wires to install a newer radio with sub.

 

[6.9_Idi]

So which parts do I need would these to fix the problem? I got several different answers and I just want to clarify.
http://www.ebay.com/itm/Fuel-Tank-S...ash=item3f4d3707be:g:LScAAOSwoudW41Sc&vxp=mtr
http://www.ebay.com/itm/Fuel-Tank-S...ash=item3f4d3707be:g:LScAAOSwoudW41Sc&vxp=mtr

Also for the rear tank I just need to replace the screen?

 

[IDIoit]

correct direct replacement.
http://www.ebay.com/itm/1985-15-For...ash=item4af65dfecb:g:A5oAAOSwk1JWgbbh&vxp=mtr

 

[6.9_Idi]

Hesutton said "The FSV can be an issue too, but you usually get other symptoms (like tanks not switching appropriately)." My tanks have not had any problems switching, could it still be the FSV? I don't want to by things I do not need.

 

[OLDBULL8]

correct direct replacement.
http://www.ebay.com/itm/1985-15-For...ash=item4af65dfecb:g:A5oAAOSwk1JWgbbh&vxp=mtr

I sure as hell wouldn't buy that one for the price. The one on ebay for $49.47 is just as good. Both may mount horizontal instead of vertical. Azone, Advanced or O'reilly stock them for around $57, but you have to get the new 6 pole pig tail connector for either one. Connector is $11. IIRC. OEM connector is a 5 pole.

 

[6.9_Idi]

Okay thanks! I would have spent the money if I knew it was the piece I needed and there was also nothing cheaper available.