HOW CAN TELL WHICH FUEL SENDER I HAVE?
In general here is a good place to start:
If you kit included a fuel sender from NVU is is a 240-33 Universal
Here are some of the OE senders, if you have an original tank chances are you have one of these:
Allranges are lsited EMPTY-FULL
240-33 UNIVERSAL AFTERMARKET
0-90 60-LATE 80S GM
0-30 EARLY (PRE-66) GM AND SOME EARLY FORD**
73-10 FORD 60S-LATE 80S
16-158 MID/LATE 80S FORD
If you purchased a sender form somewhere like a tank manufacturer, give them a call
You can also test with a multimeter to see what you have. Make sure the sender is not connected to the gauge or you will also read what is inside the instrumet as well causing a faulty reading.
Sender out of the tank: Measure the reistance on the sender output and ground (usually the base of the sender or a separate ground lead). Move the sender UP and Down (you need to knwo which way is up). Measure the readings at EMPTY and FULL there you go!
Sender in the tank.
Its easiest if you have a full or empty tank, measure resistance form the sender to ground. The number tells you the value!
CHECKING SENDER RESISTANCE AGAINST GAUGE READINGS:
Once we have figured out which sender you have, let's make sure it is operating properly. THE SENDER AND GAUGE MUST MATCH OR THE SYSTEM WILL NOT OPERATE PROPERLY.
Below is a chart of common sender values and their approxamate resistance outputs, these are general and may be within a few ohms during testing.
The gauge cannot be connected to the sender during the tests or you will read the inside of the gauge and the sender at the same time creating a false reading.
Using a multimeter set on OHMs measure between the sender post and ground.
This check should also be performed at the end of the sender wire at the gauge to confirm the same reading is being seen by the gauge (gauge must be disconnected)
