Does not mark level off gas in the tank. Is it a expessive job to fixe.

You could use two resistors, Two different ohms specs for full and empty. Place resistor between proper wire colors in diagram. Turn on the key, If gage reacts properly to full and empty resistors, then I think the problem is the sending unit in gas tank. If not, the problem could be almost anywhere, wiring circuit--pcm--instrument cluster. I did see trouble codes relating to fuel gage sending unit. I hesitate to get into that? good luck

no just pour gas in tank and cycle key a few times to prime fuel system

You will need to replace the fuel tank level sending unit.

fuel pump is in gas tank. fuel shut off switch is on the passenger side front floor pan on the firewall behind the side panel at your right toes. will car start with starting fluid sprayed into air intake. If it does then you have a fuel problem, if it doesnt then check for spark and check fuse and relays and other options before replacing expessive fuel pump

Hi, It sounds to me as though your gas tank is:

1 Dented on the bottom, so the capacity is reduced. Replace Gas Tank, or visit the filling station twice as much.

2 Has a defective float on the "Float Switch" inside the tank itsel

I did the job once on my own car. I found a Brass Float on Ebay and purched it for a few dollar.
Note: Although this job can be done Do It Yourself style, I don't recommend it. It requires skill and stringent safety procedures. If you do it FIRST: Make sure the Gas Tank is Empty.

Hope this helps,
Happy New Year,
Mark

Sounds like you may have a problem with your fuel level sending unit for your gas gauge, this will be a more difficult task to perform if your the at home mechanic because if the sending unit needs to be replaced your gas tank has to come out of the car, this part is located inside your gas tank, a twin post garage lift would make this job alot more easier especially if you never performed a job like this before....

this problem is caused by a defective gas tank sending unit for the gage and the low fuel light, replace the sending unit.

Sounds like your float is stuck or needs replaced. This is located inside your gas tank. Must remove tank to replace!

Your code is PO462.  Isuzus made 99-01 with bad fuel level sensors as well as bad fuel pumps located inside your gas tank. You can just replace the sensor but i advice you to replace the whole "fuel pump assembly" to prevent another problem. At a shop this is a costly job they will charge 500$. But if you have faith you can do it your self..it is fairly easy to replace if you have a friend to help even better. but will need to erase the code before or after doing the job to prevent the same symptoms. Buy a "Fuel pump Assembly kit" with and  a gasket (around190$).Remember always  do a job carefully to prevent braking anything.  Raise your car, locate your gas tank unbolt the 4 bolts holding it, disconnect any sensors, there should be 2 other bolts holding the tank once down, you can see the assembly with hoses disconnect too. and pull the assembly out itwill be tight, now  replace with new gasket and assembly kit press down firmly till it locks in. now connect everything the way you took out. Its actually easy...here is a pic of the whole assembly kit.....GOOD LUCK

Your fuel level sending unit is not working properly. The fuel pump and sending unit is one thing in the tank. It isn't too bad of a job to replace, it takes about 2 hours. Buy a manual for you car and it'll have step by step instructions on how to do it.