is there a way to test a sending unit?? i read the post at thingtech.com, but i must be missing somthing...
sending unit is new..got it from germans
fuel guage always reads full.
i unplugged wire to sending unit and the guage went down to the red and then to empty.. so that means that the sending unit is bad right???
how can i make sure???
thanks
caspar
sending unit
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Bob Ingman
- Posts: 2869
- Joined: Mon Mar 19, 2001 12:01 am
Caspar the final test on www.thingtech.com is to use a VOM and bench test the unit. THAT is conclusive. Hope that works for you. I have the same problem currently. Cheers. Bob Ingman
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Kubelmann
- Posts: 1380
- Joined: Sun Jan 05, 2003 12:01 am
From what you have posted, I doubt that your sender is bad.. BUT the test of disconnecting the wire and having the gauge go slowly below empty is a ture test of a bas sender. SO, you must remove the sender, dry it off and follow the sender test. I will paste from Tom's page here. His procedure is exact. If you do not have the skills or tools to perform this test, get someone to do it for you. There are only four parts to the fuel gauge system. They are, Gauge, Vibrator, wiring, Sender...
Gauge if it moves from empty to full it probably works.
Vibrator if the gas gauge does not jump around it probably works.
Wiring if pulling the wire from the sender creates a change in the gauge it probably works.
Sender
Here is the test for you to perform:
remove the sending unit from the tank and allow to dry before proceeding. Connect the meter between the battery + post and the terminal on the sender. Ground the mounting flange of the sender to the battery - post to complete the circuit. While observing the meter slowly move the float through it's range of travel. The readings should change smoothly in correspondence with the travel of the float. If you observe and lull in change or a sudden jump the sending unit ids damaged and needs to be replaced. I hope this all helps. If you remain confused, pmail me and I will help you find the source of your fuel gauge system trouble. K-mann
Gauge if it moves from empty to full it probably works.
Vibrator if the gas gauge does not jump around it probably works.
Wiring if pulling the wire from the sender creates a change in the gauge it probably works.
Sender
Here is the test for you to perform:
remove the sending unit from the tank and allow to dry before proceeding. Connect the meter between the battery + post and the terminal on the sender. Ground the mounting flange of the sender to the battery - post to complete the circuit. While observing the meter slowly move the float through it's range of travel. The readings should change smoothly in correspondence with the travel of the float. If you observe and lull in change or a sudden jump the sending unit ids damaged and needs to be replaced. I hope this all helps. If you remain confused, pmail me and I will help you find the source of your fuel gauge system trouble. K-mann