Log in or Sign up. HelloI am going to install the fuel gauge, so I have to install the sender inside the metal tank and obviously the gauge on the dash board. Right now I'm confused on fact that electric part of the sender which is connected to the 12 volts power is inside tank, and wires and resistor is submerged in fuel.
It seems a little bit dodgy to me. And the next problem is how to ground those tanks? Shold I run an wire from tank to zinc anode attached to the outside side of the hull or to negative side of battery? Thank you for any help Sebski. Power goes from ign to guage--from guage to tank sender. The whole circuit should be fused 1 amp will be sufficient. FrostyNov 20, But "grounded" means "Boat fuel gauge hook up" tanks I have to connect to negative side of battery or to zinc anode which is submerged outside the hull?
Its probable that your guage has a ground so the light bulb works!! You can ground the tank to the guage if you want, then ground the guage to neg.
Iether way is ok. If you want to ground the tank just fasten a tail from the - to one bolt of the tank sender Grounding to the external zincs is called bonding. To do this or not will "Boat fuel gauge hook up" an argument in any pub.
I would'nt ground it to the bonding Boat fuel gauge hook up. Theres lots of info on the web, Youlle have to make your own mind up. It wont stop you launching or using the boat. You can think about it and do it later if you wish. If you bond the tank then the zinc is batt neg. See what I mean it gets complicated. Could you please explain that sentence, I am not sure that I understand that. Is any chance that sender will produce circuit or spark inside the tank? From the neg on the tank that you are grounding to the guage or the batt, put another wire tail to the bolts on the sender unit,-- 2 inches.
A spark in the tank? After the resistance of the guage the current is minute. Only the good Lord knows how many times I was asked this question over the last 20 years. The tank has to be grounded only if it is a metal tank. The tank sender is screwed to the tank with meatl screws. Put a ring terminal on the end of the wire and put that on one of the screws holding the sender down to the tank. Or some senders actually have terminal lug built in.
This wire goes to the negative ground bus for the 12V DC system. Now the sender is grounded and the tank is grounded. Also, Boat fuel gauge hook up you are grounding the fuel fill run the wire from the fuel fill, down the hose to the same connection on the sender.
Second question, no the sender will not create a spark inside the tank. Even if it did it wouldn't go boom because it is too rich an environment, but all of the sensors on the market are incapable of sparking.
Take a look at this web "Boat fuel gauge hook up" http: This is grounding to the negative of the 12 v DC system. There is a difference. All grounds in the 12v DC system lead back to one point, generally the engine where the system is grounded. IkeNov 20, The way the gauge works, is it senses the amount of ground the sender is providing the gauge to read.
This way, no power is transmitted into or near the tank, neck, fill, vents, etc.
There's a little coil on the sender with a moving contact, which is attached to the arm having a float on the end. This moves the contact across the coil. The sender presents the gauge with the amount of resistance the coil is providing depending on the location of the contact.
If the tank is full the contact is right at the beginning of the coil where the resistance is very low, "Boat fuel gauge hook up" the gauge reads this as full tank full ground. As the fuel level drops, the contact moves across this coil increasing resistance, which the gauge registers as less then a full tank.
In fact, the first thing I do when accessing a fuel gauge or sender problem is ground the sender lead at the sender. If it reads full on the gauge, the sender is likely bad or has a bad connection. If the gauge reads zip, the gauge or Boat fuel gauge hook up wiring fault needs to be addressed.
The hot terminal on the gauge is for the light. The grounded tank is important as Ike points out on metal tanks. The filler should be grounded. This prevents a static spark from turning your lovely afternoon into a bad day.
For what it's worth, a very large percentage of electrical issues can be sorted back to a bad ground somewhere. The marine environment is a nasty place for electrical components and connections.
Once perfectly good and working circuits can take a dump with little warning. Just reseating connections can restore function if momentary and tell you what's really going on.
PARNov 21, If you buy one of the new tubular inductive guages they work even better, are more accurate and the current used is very low. How they work is thus: On the outside of the tube is a circular donut shaped coil.