My gas guage does not go all the way to the top, so i know it is running low, is there a way to fix it?
thanks nate

Does it then take a while before it starts to drop, waiting for the gas to be consumed down to the level the needle is?

Don't know on yours, but I've bought a Gen II sending unit for something like $60 maybe, and a Gen I 4-cyl for like $35.

Either the float is sinking or something changed the resistance. I think the resistance increases from full to empty. Mine gage reads zero until I run thru deep water, then it reads until it dries. I must have a bad ground (infinite resistance) between the float level assy and the tank.
Bob Shaw

i got a new sending unit, so that not the problem, can i get a new guage
nate

Well, probably is the gauge then. Are you sure you have a good connection to the new sender? I'll bet a corroded connector on the harness side might cause some trouble. As for the gauge itself, I would think you could find one readily at the yards. Might have to buy the whole gauge panel though.

A connector that has higher than normal resistance but is otherwise OK can cause the guage to read lower than normal at all times. That is if it is the same as GM (and most brands are). Take the gauge wires at the tank and disconnect them (if you can, I've never looked at it) then cross them. Make sure your crossing the correct wires first. The gauge should peg full. This will tell you nothing, but you'll know the gauge is capable of reading full if all else fails.

If someone out there knows I am wrong about this, speak up. This works on 90% of cars I've seen so I'm just assuming it'll work on a Mitsu.

Clay

There is a voltage regulator on the back of the pc board for the gauges. It limits gauge voltage to 7v, and serves the temp and fuel gauges. If it loses it's ground, it allows full voltage to the gauges, permanently warping the bimetals inside, causing a low reading on BOTH gauges. The ground is a screw on the pc board, and is shown in the FSM. The only cure is to swap out the gauges, and tighten the ground. With a normal gauge and stock thermostat, your temp gauge should be just short of half scale at normal op temps.

ClayV
My Raider has only one wire from the gage to the tank. The 2nd wire is the ground?
Bob Shaw

Ground the single wire and the gauge should go full scale - don't leave it grounded long.

Here's the 89 manual #'s:
Fuel gauge resistance value (ohms)
terminals 1 (power) & 2 (gauge) 55
terminals 2 & 3 (gnd) 165
Fuel gauge unit resistance value (ohms)
Float point ôFö: 1-5
Float point "Eö: 103-117

Yep, I wasa mistaken. Sorry to add confusion to what was a very good thread.

Like I said, my thought were based on GM experience, not Mitsubishi.

The really cool thing is it got everybody talking about the right stuff and being more direct about how this thing works. I think that's great.

I didn't know Mitsu only used one wire for the fuel sender. That makes it a ground from the gauge and the sender provides varying resistance via the float to provide more current to ground or less. Pretty cool. and I bet it works really well as apposed to anything GM has put out in recent memory (cough, since '95, cough cough). <img src="/forums/images/graemlins/lol.gif" alt="" />

Clay