89 Mustang Fuel Gauge Always Reads Full

Tech and Install > Universal Fuel Sender Questions and Troubleshooting

Universal Fuel Sender Questions and Troubleshooting

Which sender should I choose?

The resistance of your fuel sender should match that of your guess.  For case the resistance of the stock estimate in a 55 Chevy has a value of zero ohms when empty and 30 ohms when full.  The following list is for stock gauges and some popular aftermarket brands:

• Ford upwards to 1986 - 73-ten Ohms
• Ford 1987 & up - 16-158 Ohms
• GM upward to 1964 - 0-30 Ohms
• GM 1965-1997 - 0-ninety Ohms
• GM 1998 & up - 40-250 Ohms
• Mopar up to 1986 - 73-10 Ohms
• AMC 1950-1977 - 73-x Ohms
• Autometer -240-33 Ohmsis the about common however other ohm ranges are made
• Classic Instruments - 240-33 Ohms (excluding vehicle specific approximate kits which use manufactory ohm range)
• Dolphin - 0-ninety Ohms
• Dakota Digital - Programmable to piece of work with most Ohm range senders
• VDO - x-180 Ohms

The kickoff number represents the empty Ohm reading and the 2d number is the full reading.

My fuel gauge only reads empty.

If you cannot make your estimate read annihilation only empty then depending on your ohm range you may have 1 of the following bug:

If y'all accept a 0-30, 0-90, and 10-180 Ohm sender then about likely your sender lead wire is grounding out somewhere.  Or peradventure the middle concluding on the sending unit itself is grounding out against the trunk of the auto.

If you take a 240-33 or 73-ten Ohm sender then the sender may non take a proper ground or there is a suspension in the sender lead wire.

My fuel approximate only reads total.

If you cannot make your gauge read anything but total and so depending on your ohm range y'all may accept ane of the following bug:

If you have a 0-xxx, 0-90 or x-180 Ohm sender then the sender may non have a proper basis or there is a pause in the sender atomic number 82 wire.

If you lot have a 240-33 or 73-ten Ohm sender then most probable your sender pb wire is grounding out somewhere.  Or perchance the center terminal on the sending unit itself is grounding out confronting the trunk of the car.

Sender Bolt Design & Swing

Our tanks are ready for the standard SAE 5-hole bolt pattern used by all of the aftermarket gauge manufacturers. The 5-holes are not evenly spaced.   Two of the holes are further autonomously than the other holes. If yous are holding the sender with those 2 holes closest to your body, the hole directly across is known as the index hole.  If the float swings to the correct, information technology is a right-swing sender . If it swings to the left, information technology is a left-swing sender.

Will this sender piece of work with a six volt system?

Yeah.  Your fuel guess is simply reading a resistance to basis.  Considering your gauge is only reading the amount of resistance to ground this sender will piece of work regardless of the voltage of your car.

How does a fuel sender work?

Fuel senders have a rheostat that provides a resistance to basis.  Equally the fuel arm moves from the empty to the full position a contact is moved across the board on the rheostat which varies the resistance seen by the fuel gauge.  For example a 69 Camaro has a 0-90 ohm fuel sender.  When the sender is at the empty position the rheostat is not creating whatever resistance to ground (zero ohms). When the fuel sender is in the full position the rheostat is creating ninety ohms of resistance to basis.  Because the gauge is reading a resistance to basis having proper grounding of the sending unit is essential to go an accurate reading on your fuel gauge.

How do I examination my fuel sender?

A fuel sender tin be bench tested with a multimeter.  With the multimeter set to the Ω setting put the red probe on the post that is the guess lead and put the black probe on the basis post or on the body of the fuel sender.  Record your readings with the fuel sender in the empty position and in the total position.  Those ii numbers will tell you the ohm range is of your sender.

Why does my gauge read backwards?

The first pace would be to make certain that you take the proper ohm range fuel sender to match your gauges.  For case a 73-ten ohm fuel sender would read backwards on a 0-xc ohm fuel approximate.  If yous observe y'all accept the right ohm range fuel sender brand sure that the float arm is installed on the correct side.  The front end of the rheostat shows which side the bladder should stick out from.  If the float arm is installed on the other side the judge will read backwards.  Besides if the rheostat is installed upside downward the gauge will read backwards.

I took my sender autonomously and now it doesn't work.

If for some reason you accept disassembled your sender and now can't go it to read check the following:

1. Make sure that the bracket is in full contact with the flange.  There should be full continuity between the metal strip between the rheostat and the bracket and the bracket and the flange.
2. Make sure that the middle judge atomic number 82 postal service is isolated from the flange and bracket.  If that post is grounding out you will only see zero ohms on a gauge or multimeter.

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Source: https://www.tanksinc.com/index.cfm/page/ptype=results/category_id=159/mode=cat/cat159.htm

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